Re: [time-nuts] Wavecrest DTS 2070
Nod, this is the problem I have, It says 110/220 but is it automatic or do I need to change the strapping? I had a look at Ed Palmers excellent tear down and there were switch mode PSU in it. But he has a 2077, mines a 2070 so it could be completely different, or not.. Arrgh.. I am so wanting to plug it in, unlike Ed I have a place ready for it! I guess Oracle Palmer will be online later and will be able to provide an answer :) -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Monday, 9 September 2013 2:22 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Oops. Maybe I should have just kept my peace. I found a User's Guide here: http://qmsi.com/pics/Wavecrest2070.a.pdf; which indicates it can take either 110 or 220. Pry open the fuse compartment and see what's in there. Someone else will now probably post the right way to go about it, though. =) Bob - AE6RV From: Bob Stewart b...@evoria.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, September 8, 2013 11:13 PM Subject: Re: [time-nuts] Wavecrest DTS 2070 Go to a tourist supply store and buy a 110 to 230/250 transformer. I did that the year I spent in France for a TV or something we took over there. Be sure you get one that's big enough. Be sure you don't wire it backwards and get 250 to 500!!! Bob - AE6RV From: Mark C. Stephens ma...@non-stop.com.au To: time-nuts@febo.com time-nuts@febo.com Sent: Sunday, September 8, 2013 11:05 PM Subject: [time-nuts] Wavecrest DTS 2070 I just received my DTS 2070 from 110 volt land. I live in 230 (well actually 250) volt land. I haven't plugged it in and I am being a total wuss about breaking the CAL seals as they are still current. Please help me, I really, really need to measure something with it! Anything with it! But to do that I need to apply power! Is the DTS 2070 PSU auto sensing or do I need to change something? --marki ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
I pried open the fuse compartment. Both fuses black. Black as in dead short black. Not good. Short circuit on mains input. Open case. big thick wire carry mains to solid state relay then off to switch mode modules. Relay cannot be short between supplies. Must be one or more PSU with chopper or bridge short. Marki will have to be careful. Expensive and dangerous equipment at stake. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Monday, 9 September 2013 2:22 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Oops. Maybe I should have just kept my peace. I found a User's Guide here: http://qmsi.com/pics/Wavecrest2070.a.pdf; which indicates it can take either 110 or 220. Pry open the fuse compartment and see what's in there. Someone else will now probably post the right way to go about it, though. =) Bob - AE6RV From: Bob Stewart b...@evoria.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, September 8, 2013 11:13 PM Subject: Re: [time-nuts] Wavecrest DTS 2070 Go to a tourist supply store and buy a 110 to 230/250 transformer. I did that the year I spent in France for a TV or something we took over there. Be sure you get one that's big enough. Be sure you don't wire it backwards and get 250 to 500!!! Bob - AE6RV From: Mark C. Stephens ma...@non-stop.com.au To: time-nuts@febo.com time-nuts@febo.com Sent: Sunday, September 8, 2013 11:05 PM Subject: [time-nuts] Wavecrest DTS 2070 I just received my DTS 2070 from 110 volt land. I live in 230 (well actually 250) volt land. I haven't plugged it in and I am being a total wuss about breaking the CAL seals as they are still current. Please help me, I really, really need to measure something with it! Anything with it! But to do that I need to apply power! Is the DTS 2070 PSU auto sensing or do I need to change something? --marki ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
After removing endless hex screws to get at the insides I find the 24V/2A PSU that supplies the standby voltages has what appears to be a transformer primary short. Problem is, one has to remove the input board to get at the PSU screws. Sounds easy when put like that... I'll take some pix to show why I am so terrified of this input board. Looking at Eds teardown on http://www.eevblog.com/forum/testgear/wavecrest-dts-2077-teardown/?action=dlattach;attach=58083 Ed has a single standby switch mode - the small silver slotted box with the yellow wires. Mine is ancient and has 2 linear PSU, but hey, it's got the yellow wires! Anyway I have, used my post quota for the day - nite.. Oh before I go, luckily I checked, yes all the PSU (in this model) need strapping for utilised input voltage. I found a couple of expanded/exploded surface mount electro (tantalum?) caps on the filter board between the switch mode frame and the card cage. I have not a clue what that means.. --marki -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark C. Stephens Sent: Monday, 9 September 2013 6:31 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 I pried open the fuse compartment. Both fuses black. Black as in dead short black. Not good. Short circuit on mains input. Open case. big thick wire carry mains to solid state relay then off to switch mode modules. Relay cannot be short between supplies. Must be one or more PSU with chopper or bridge short. Marki will have to be careful. Expensive and dangerous equipment at stake. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Monday, 9 September 2013 2:22 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Oops. Maybe I should have just kept my peace. I found a User's Guide here: http://qmsi.com/pics/Wavecrest2070.a.pdf; which indicates it can take either 110 or 220. Pry open the fuse compartment and see what's in there. Someone else will now probably post the right way to go about it, though. =) Bob - AE6RV From: Bob Stewart b...@evoria.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, September 8, 2013 11:13 PM Subject: Re: [time-nuts] Wavecrest DTS 2070 Go to a tourist supply store and buy a 110 to 230/250 transformer. I did that the year I spent in France for a TV or something we took over there. Be sure you get one that's big enough. Be sure you don't wire it backwards and get 250 to 500!!! Bob - AE6RV From: Mark C. Stephens ma...@non-stop.com.au To: time-nuts@febo.com time-nuts@febo.com Sent: Sunday, September 8, 2013 11:05 PM Subject: [time-nuts] Wavecrest DTS 2070 I just received my DTS 2070 from 110 volt land. I live in 230 (well actually 250) volt land. I haven't plugged it in and I am being a total wuss about breaking the CAL seals as they are still current. Please help me, I really, really need to measure something with it! Anything with it! But to do that I need to apply power! Is the DTS 2070 PSU auto sensing or do I need to change something? --marki ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Hi, The 207x is. Auto sensing for the mains. Groet, Henk Op 9 sep. 2013 om 11:52 heeft Mark C. Stephens ma...@non-stop.com.au het volgende geschreven: After removing endless hex screws to get at the insides I find the 24V/2A PSU that supplies the standby voltages has what appears to be a transformer primary short. Problem is, one has to remove the input board to get at the PSU screws. Sounds easy when put like that... I'll take some pix to show why I am so terrified of this input board. Looking at Eds teardown on http://www.eevblog.com/forum/testgear/wavecrest-dts-2077-teardown/?action=dlattach;attach=58083 Ed has a single standby switch mode - the small silver slotted box with the yellow wires. Mine is ancient and has 2 linear PSU, but hey, it's got the yellow wires! Anyway I have, used my post quota for the day - nite.. Oh before I go, luckily I checked, yes all the PSU (in this model) need strapping for utilised input voltage. I found a couple of expanded/exploded surface mount electro (tantalum?) caps on the filter board between the switch mode frame and the card cage. I have not a clue what that means.. --marki -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark C. Stephens Sent: Monday, 9 September 2013 6:31 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 I pried open the fuse compartment. Both fuses black. Black as in dead short black. Not good. Short circuit on mains input. Open case. big thick wire carry mains to solid state relay then off to switch mode modules. Relay cannot be short between supplies. Must be one or more PSU with chopper or bridge short. Marki will have to be careful. Expensive and dangerous equipment at stake. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Monday, 9 September 2013 2:22 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Oops. Maybe I should have just kept my peace. I found a User's Guide here: http://qmsi.com/pics/Wavecrest2070.a.pdf; which indicates it can take either 110 or 220. Pry open the fuse compartment and see what's in there. Someone else will now probably post the right way to go about it, though. =) Bob - AE6RV From: Bob Stewart b...@evoria.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, September 8, 2013 11:13 PM Subject: Re: [time-nuts] Wavecrest DTS 2070 Go to a tourist supply store and buy a 110 to 230/250 transformer. I did that the year I spent in France for a TV or something we took over there. Be sure you get one that's big enough. Be sure you don't wire it backwards and get 250 to 500!!! Bob - AE6RV From: Mark C. Stephens ma...@non-stop.com.au To: time-nuts@febo.com time-nuts@febo.com Sent: Sunday, September 8, 2013 11:05 PM Subject: [time-nuts] Wavecrest DTS 2070 I just received my DTS 2070 from 110 volt land. I live in 230 (well actually 250) volt land. I haven't plugged it in and I am being a total wuss about breaking the CAL seals as they are still current. Please help me, I really, really need to measure something with it! Anything with it! But to do that I need to apply power! Is the DTS 2070 PSU auto sensing or do I need to change something? --marki ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] New NTBW50AA
Hi I think you may be looking at the ADEV and reading more into it than you should. It's a table of ADEV vs Tau. The longer you have data for, the larger Tau (seconds) it will display. It's not getting better as it displays more data it the table, it's just got more seconds of data. ADEV should be a measure of stability. In the case of a GPSDO, you have an OCXO that's locked to the GPS. As the GPS moves, the OCXO follows the GPS. There is no independent referee to let you know if things are moving in the right or wrong direction. Put another way, it's like looking at the reference on your counter by plugging it into the front of the counter. Because the OCXO always follows the GPS, the ADEV as shown will always get better with time. You are getting further and further inside the control loop. To really know what's going on with the GPSDO you need an independent standard to compare it to. Even a cheap Rb will help you figure out how stable the frequency really is. A Cs or a Hydrogen Maser would (of course) be better. Bob On Sep 8, 2013, at 5:51 PM, quartz55 quart...@hughes.net wrote: I did the a command and it seems to have straightened out. I don't know what I did but now it toggles from full screen to a window fine for now. It changed the el and amu masks. I'll let it run overnight see how it is and then try moving the antenna to what I think may be it's permanent position and see if it works there. I goggled the Lat Lon and it puts the antenna right on my deck where I have it. I notice the mouse acts erratically sometimes, I have a laptop I may press into service for this thing but it's a vista OS. I found lots of info in heather.cpp, but I wonder if the keyboard commands aren't somewhere easier to find, other than the space bar. It's gone up to 3.63e-12 now. Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] New NTBW50AA
Hi The only normal use for even second outputs is in a CDMA base station. The same is true of the multitude of 9.x MHz outputs coming out of the back of that unit. From what I have seen of LH, there's no real need to play with anything else on these units. The only thing you might do is to scan for unknown / undocumented commands with a chunk of custom code. Bob On Sep 8, 2013, at 9:43 PM, quartz55 quart...@hughes.net wrote: Thanks guys. That's all useful information, I think. I'm still trying to understand the lingo. The temp trace is still whacking down, but not as much as before. I guess it's way to early to start complaining about this unit. The 1 tau is now at 6.4e-12 it seems to be going back up. I was sort of hoping for around 1e-12, but still 6.4 is 6.4 Hz out of 1,000,000 MHz if I'm doing my decimals right. And that's plenty good for me, it's still orders of magnitude under the mHz range at even UHF. The green trace, DAC is still drifting down, but nothing on the unit has changed, the yellow LED remains on as well as the green lock LED. The switching supply is slightly warm, but cooler than the OCXO by feel. I can't imagine either one of them is over 90F. I could put the Fluke thermister on them if it's of any interest. I've got the cover off of it for now. The cover will go back on, but the unit will be in a well ventilated space and the temp is pretty constant in this room. I've got a pipe right above the radio room for a UHF/VHF vertical and I'm going to try mounting a bracket off that to put the antenna on tomorrow. It'll be out of sight there from the deck but still a bit under the oaks. Should I do the E command and save the config before I turn things off and then do a detailed survey at the new position or just do a new survey when I start up again? My Nortel unit has only the even seconds output. As far as I know I don't have any use for the seconds output, I'm just looking for a good 10MHz ref. Is there any use to look at the Tboltmon.exe or is that a waste of time? Dave N3DT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] New NTBW50AA
Wait a minute, Bob. I have an LPRO with good reported bulb voltatge. Are you telling me this TBolt is no better than the Rb standard, as far as stability and perhaps worse? And the frequency accuracy is also no better and both have to be compared to a Cs or H Maser to be calibtated? I thought the GPS put out these precise second pulses that the TBolt would measure over time and discipline the OCXO to those precision seconds over time resulting in a variable (very small) but precise statistical frequency (unlike the Rb which is just very stable) and thus having a reference back to NIST to a degree. (in my simplistic language) Yes, I'm not fully understanding the Tau and ADEV I'm sure. I did read it's the sq root of Allan variance. So the reported 1 Tau ADEV is not a measurement of the variance of the frequency compared to the precise 1 second marks over time? I thought if I had 1.0e-12 that was comparable to knowing it's within 1Hz at a billion (10^12) Hz? Should I reverse the a command I did and let it run in the mode I got it in? The 1 ADEV is back down to 1.6e-12 this morning. You can see the screenshot here, http://s251.photobucket.com/user/DogTi/media/time/20139-91229_zps7e475453.jpg.html it looks like the temp is still jumping but for some reason the number of sats has increased, a lot, maybe it's just the harmonic convergence. Is that white line that runs around the center essentially the frequency variance? And why do I have what appears to be multiple blue and red lines? So many questions, so little time. Anyhow, as soon as it warms up a bit and I have my Earl Grey, I'm going to turn this thing off and go reset the antenna and see what happens, I need to make a bracket which won't take long. I just worry about climbing up the ladder these days since I had a herniated disc removed and a spacer installed this spring. At least the pain is gone and I'm not in a wheelchair. Dave N3DT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Lightning Strike Site
FYI: http://thunderstorm.vaisala.com/explorer.html -John === ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightning Strike Site
On 9/9/13 5:59 AM, J. Forster wrote: FYI: http://thunderstorm.vaisala.com/explorer.html -John the underlying National Lightning Detection Network distributes the data with a timing precision of 1 microsecond RMS. I assume their sensors are GPS synchronized. The location is done by a combination of direction and time of arrival. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] GPS choices.
Although the inexpensive yet high sensitivity units are nice I'm not sure why someone would choose a positioning MTK (e.g. Adafruit) over a timing Ublox (or even an old Motorola style timing receiver). Am I missing something? Also is the (up to) 10MHz output from a 6T as useful as it seems it should be given ~30/15ns quoted accuracy? Oh and is anyone trying to get better time with a 6T using raw data or does that only help with better position? (If only I knew what I was doing) Thanks. -- Paul ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] PRS10 time tagging
After feeding pps into a PRS10 I've noticed that after the deltas drop to the single digits the tags become sporadic. Not -1 rather no response at all even though PLL is asserted. Is this a known issue or am I confused again? I sample on the even minute and see things like this: TT: 1 TT: 0 TT: 0 TT: TT: TT: 4 TT: TT: TT: TT: 5 TT: 7 TT: 7 TT: 14 TT: 11 TT: 12 TT: 6 TT: 7 TT: 9 TT: 10 TT: 9 TT: 6 TT: 6 TT: TT: 2 TT: 1 TT: 0 TT: 6 TT: 6 TT: 0 TT: 3 TT: 0 TT: 3 TT: 6 TT: 3 TT: 2 TT: 0 TT: TT: 1 TT: TT: TT: 3 TT: TT: TT: TT: 2 TT: 1 TT: TT: TT: TT: TT: 2 Thanks. -- Paul ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS choices.
On 9/9/13 8:08 AM, Paul wrote: Although the inexpensive yet high sensitivity units are nice I'm not sure why someone would choose a positioning MTK (e.g. Adafruit) over a timing Ublox (or even an old Motorola style timing receiver). Sometimes, continuing availability is a bigger design driver. If you want something that you can make for the next 2 or 3 years, then depending on surplus new-old-stock is a dicey proposition. While the specific part that Adafruit sells may go away, it is extremely likely that there will be a virtually equivalent (as in pin compatible/software compatible) part available into the future. Ublox is, I think, in that category of will be available in some form for a while Or it might be as simple as if I buy it from Adafruit, it will be delivered tomorrow, and has instructions on how to hook it up. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Hi Henk, mine has option a110. The linear supply is definitely strapped for 110v. I disconnected the primary and connected a 24v system supply in its place. Everything burst into life (at 110v, through step-down transformer) Haven't been game to try 230v yet... I guess I'll look at fix or replace 24v standby linear PSU. The second linear has me scratching my head, 2V@6A and is activated by solid state relay. Goes off to the card frame somewhere, haven't tried tracing yet. Definitely not looking forward to removing that monster bottom board. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Henk ten Pierick Sent: Monday, 9 September 2013 9:05 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Hi, The 207x is. Auto sensing for the mains. Groet, Henk Op 9 sep. 2013 om 11:52 heeft Mark C. Stephens ma...@non-stop.com.au het volgende geschreven: After removing endless hex screws to get at the insides I find the 24V/2A PSU that supplies the standby voltages has what appears to be a transformer primary short. Problem is, one has to remove the input board to get at the PSU screws. Sounds easy when put like that... I'll take some pix to show why I am so terrified of this input board. Looking at Eds teardown on http://www.eevblog.com/forum/testgear/wavecrest-dts-2077-teardown/?act ion=dlattach;attach=58083 Ed has a single standby switch mode - the small silver slotted box with the yellow wires. Mine is ancient and has 2 linear PSU, but hey, it's got the yellow wires! Anyway I have, used my post quota for the day - nite.. Oh before I go, luckily I checked, yes all the PSU (in this model) need strapping for utilised input voltage. I found a couple of expanded/exploded surface mount electro (tantalum?) caps on the filter board between the switch mode frame and the card cage. I have not a clue what that means.. --marki -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark C. Stephens Sent: Monday, 9 September 2013 6:31 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 I pried open the fuse compartment. Both fuses black. Black as in dead short black. Not good. Short circuit on mains input. Open case. big thick wire carry mains to solid state relay then off to switch mode modules. Relay cannot be short between supplies. Must be one or more PSU with chopper or bridge short. Marki will have to be careful. Expensive and dangerous equipment at stake. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Monday, 9 September 2013 2:22 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Oops. Maybe I should have just kept my peace. I found a User's Guide here: http://qmsi.com/pics/Wavecrest2070.a.pdf; which indicates it can take either 110 or 220. Pry open the fuse compartment and see what's in there. Someone else will now probably post the right way to go about it, though. =) Bob - AE6RV From: Bob Stewart b...@evoria.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, September 8, 2013 11:13 PM Subject: Re: [time-nuts] Wavecrest DTS 2070 Go to a tourist supply store and buy a 110 to 230/250 transformer. I did that the year I spent in France for a TV or something we took over there. Be sure you get one that's big enough. Be sure you don't wire it backwards and get 250 to 500!!! Bob - AE6RV From: Mark C. Stephens ma...@non-stop.com.au To: time-nuts@febo.com time-nuts@febo.com Sent: Sunday, September 8, 2013 11:05 PM Subject: [time-nuts] Wavecrest DTS 2070 I just received my DTS 2070 from 110 volt land. I live in 230 (well actually 250) volt land. I haven't plugged it in and I am being a total wuss about breaking the CAL seals as they are still current. Please help me, I really, really need to measure something with it! Anything with it! But to do that I need to apply power! Is the DTS 2070 PSU auto sensing or do I need to change something? --marki ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
Re: [time-nuts] Lightning Strike Site
On 9/9/13 8:36 AM, Bob Smither wrote: On 09/09/2013 07:59 AM, J. Forster wrote: FYI: http://thunderstorm.vaisala.com/explorer.html Here is another one: http://www.strikestarus.com/ That uses an ad-hoc network of Boltek detectors, which work ok. I had one in 1999-2000 at work.. although as I recall, they do position by using direction of arrival and have some scheme for turning field intensity into distance to stroke. The NLDN uses time difference of arrival at multiple stations to come up with a position, and then, knowing the distance, they can turn received field into stroke current. If I were doing scientific research, or had a need for validated lightning data, the NLDN (operated by Vaisala for the government) would be my choice. There's an even more sophisticated system for smaller areas (around Huntsville, for example) that works at 80 MHz and can map the individual segments of the lightning stroke. They definitely use GPS synchronization and time difference of arrival at multiple receiver sites. There are some truly awesome animations of data from this system that show things like cloud to cloud lightning as it develops, as well as more conventional cloud/ground strokes. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightning Strike Site
On 09/09/2013 07:59 AM, J. Forster wrote: FYI: http://thunderstorm.vaisala.com/explorer.html -John === ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. Here is another one: http://www.strikestarus.com/ -- Bob Smither, Ph.D. - Linux User 281-331-2744; fax:-4616 smit...@c-c-i.com = Unix IS user friendly - it's just selective about who its friends are = attachment: smither.vcf___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed On 9/9/2013 1:01 AM, Mark C. Stephens wrote: Nod, this is the problem I have, It says 110/220 but is it automatic or do I need to change the strapping? I had a look at Ed Palmers excellent tear down and there were switch mode PSU in it. But he has a 2077, mines a 2070 so it could be completely different, or not.. Arrgh.. I am so wanting to plug it in, unlike Ed I have a place ready for it! I guess Oracle Palmer will be online later and will be able to provide an answer :) -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Monday, 9 September 2013 2:22 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Oops. Maybe I should have just kept my peace. I found a User's Guide here: http://qmsi.com/pics/Wavecrest2070.a.pdf; which indicates it can take either 110 or 220. Pry open the fuse compartment and see what's in there. Someone else will now probably post the right way to go about it, though. =) Bob - AE6RV From: Bob Stewart b...@evoria.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, September 8, 2013 11:13 PM Subject: Re: [time-nuts] Wavecrest DTS 2070 Go to a tourist supply store and buy a 110 to 230/250 transformer. I did that the year I spent in France for a TV or something we took over there. Be sure you get one that's big enough. Be sure you don't wire it backwards and get 250 to 500!!! Bob - AE6RV From: Mark C. Stephens ma...@non-stop.com.au To: time-nuts@febo.com time-nuts@febo.com Sent: Sunday, September 8, 2013 11:05 PM Subject: [time-nuts] Wavecrest DTS 2070 I just received my DTS 2070 from 110 volt land. I live in 230 (well actually 250) volt land. I haven't plugged it in and I am being a total wuss about breaking the CAL seals as they are still current. Please help me, I really, really need to measure something with it! Anything with it! But to do that I need to apply power! Is the DTS 2070 PSU auto sensing or do I need to change something? --marki ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] A day gone awry...
Wow! Sorry to hear that you tripped over your 2077. Burt, K6OQK At 09:00 AM 9/9/2013, time-nuts-requ...@febo.com wrote By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] A day gone awry...
At least I didn't drop it on my foot! :) Ed On 9/9/2013 10:10 AM, Burt I. Weiner wrote: Wow! Sorry to hear that you tripped over your 2077. Burt, K6OQK At 09:00 AM 9/9/2013, time-nuts-requ...@febo.com wrote By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] New NTBW50AA
I moved the antenna, and did a new standard survey which took an hour and then another 5 minutes or so to lock. The sats don't seem to be any less right under the trees. You can see the antenna and trees here. http://s251.photobucket.com/user/DogTi/library/time?sort=3page=1 I'll let it run and check on it now and then. Now if I had the XRef from VK3HZ. This thing seems much more accurate than the Nuvi we have. It puts the antenna right on google where it actually is. I wish I could move this antenna around and do a bit of surveying with it. I've got a couple property lines I'm not sure where it is except in a general way. Like the end points, but the line in between is about a half mile and through the woods so you can't see line of sight. Can someone tell me where to go to read about the items that are listed in LH? Dave N3DT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? All the PSU screw heads are under it (of course) -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed On 9/9/2013 1:01 AM, Mark C. Stephens wrote: Nod, this is the problem I have, It says 110/220 but is it automatic or do I need to change the strapping? I had a look at Ed Palmers excellent tear down and there were switch mode PSU in it. But he has a 2077, mines a 2070 so it could be completely different, or not.. Arrgh.. I am so wanting to plug it in, unlike Ed I have a place ready for it! I guess Oracle Palmer will be online later and will be able to provide an answer :) -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Monday, 9 September 2013 2:22 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Oops. Maybe I should have just kept my peace. I found a User's Guide here: http://qmsi.com/pics/Wavecrest2070.a.pdf; which indicates it can take either 110 or 220. Pry open the fuse compartment and see what's in there. Someone else will now probably post the right way to go about it, though. =) Bob - AE6RV From: Bob Stewart b...@evoria.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, September 8, 2013 11:13 PM Subject: Re: [time-nuts] Wavecrest DTS 2070 Go to a tourist supply store and buy a 110 to 230/250 transformer. I did that the year I spent in France for a TV or something we took over there. Be sure you get one that's big enough. Be sure you don't wire it backwards and get 250 to 500!!! Bob - AE6RV From: Mark C. Stephens ma...@non-stop.com.au To: time-nuts@febo.com time-nuts@febo.com Sent: Sunday, September 8, 2013 11:05 PM Subject: [time-nuts] Wavecrest DTS 2070 I just received my DTS 2070 from 110 volt land. I live in 230 (well actually 250) volt land. I haven't plugged it in and I am being a total wuss about breaking the CAL seals as they are still current. Please help me, I really, really need to measure something with it! Anything with it! But to do that I need to apply power! Is the DTS 2070 PSU auto sensing or do I need to change something? --marki ___ time-nuts mailing list -- time-nuts@febo.com To
Re: [time-nuts] Wavecrest DTS 2070
OK now I know what a 2077 dts is. Quite the piece of test equipment. I bet it would hurt if you dropped it on your foot. Regards Paul WB8TSL/1 On Mon, Sep 9, 2013 at 2:15 PM, Mark C. Stephens ma...@non-stop.com.auwrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? All the PSU screw heads are under it (of course) -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed On 9/9/2013 1:01 AM, Mark C. Stephens wrote: Nod, this is the problem I have, It says 110/220 but is it automatic or do I need to change the strapping? I had a look at Ed Palmers excellent tear down and there were switch mode PSU in it. But he has a 2077, mines a 2070 so it could be completely different, or not.. Arrgh.. I am so wanting to plug it in, unlike Ed I have a place ready for it! I guess Oracle Palmer will be online later and will be able to provide an answer :) -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Monday, 9 September 2013 2:22 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Oops. Maybe I should have just kept my peace. I found a User's Guide here: http://qmsi.com/pics/Wavecrest2070.a.pdf; which indicates it can take either 110 or 220. Pry open the fuse compartment and see what's in there. Someone else will now probably post the right way to go about it, though. =) Bob - AE6RV From: Bob Stewart b...@evoria.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, September 8, 2013 11:13 PM Subject: Re: [time-nuts] Wavecrest DTS 2070 Go to a tourist supply store and buy a 110 to 230/250 transformer. I did that the year I spent in France for a TV or something we took over there. Be sure you get one that's big enough. Be sure you don't wire it backwards and get 250 to 500!!! Bob - AE6RV From: Mark C. Stephens ma...@non-stop.com.au To: time-nuts@febo.com time-nuts@febo.com Sent: Sunday, September 8, 2013 11:05 PM Subject: [time-nuts] Wavecrest DTS 2070 I just received my DTS 2070 from 110 volt land. I live in 230 (well actually 250) volt land. I haven't plugged it in and I am being a total wuss about breaking the CAL seals as they are still current. Please help me, I
Re: [time-nuts] GPS choices.
There are other options for in-production GPS recievers that are better for timing The Oncore MT12 has been available for many years and will be in the future. They are still made and the instructions are a big thick book written by English speaking technical writers at Motorola. These are real timing mode receivers with 5ns 1 sigma accuracy priced at well under $100. The other devices are great for people who like to build small remote control cars. But if the zGPS is used only to drive NTP, this whole discussion is moot, 500ns is better than good enough for NTP. On Mon, Sep 9, 2013 at 9:05 AM, Jim Lux jim...@earthlink.net wrote: On 9/9/13 8:08 AM, Paul wrote: Although the inexpensive yet high sensitivity units are nice I'm not sure why someone would choose a positioning MTK (e.g. Adafruit) over a timing Ublox (or even an old Motorola style timing receiver). Sometimes, continuing availability is a bigger design driver. If you want something that you can make for the next 2 or 3 years, then depending on surplus new-old-stock is a dicey proposition. While the specific part that Adafruit sells may go away, it is extremely likely that there will be a virtually equivalent (as in pin compatible/software compatible) part available into the future. Ublox is, I think, in that category of will be available in some form for a while Or it might be as simple as if I buy it from Adafruit, it will be delivered tomorrow, and has instructions on how to hook it up. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS choices.
Although the inexpensive yet high sensitivity units are nice I'm not sure why someone would choose a positioning MTK (e.g. Adafruit) over a timing Ublox (or even an old Motorola style timing receiver). Am I missing something? Also is the (up to) 10MHz output from a 6T as useful as it seems it should be given ~30/15ns quoted accuracy? Oh and is anyone trying to get better time with a 6T using raw data or does that only help with better position? (If only I knew what I was doing) Thanks. Paul = Paul, It's a combination of availability, cost, power consumption, no extra power supplies needed, coupled with the engineering realisation that in my application (NTP on Linux, FreeBSD and Windows) I'll be highly unlikely to see the difference in accuracy between timing and navigation units. Old-style would be rather out of keeping with a Raspberry Pi, wouldn't it? http://www.satsignal.eu/ntp/RaspberryPi-2-with-Adafruit-GPS.jpg Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] A day gone awry...
OK I don't get it. When I search for a 2077 I get some online game. Now it makes sense that thats a time sink but generally nothing that will break a tooth. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 12:48 PM, Ed Palmer ed_pal...@sasktel.net wrote: At least I didn't drop it on my foot! :) Ed On 9/9/2013 10:10 AM, Burt I. Weiner wrote: Wow! Sorry to hear that you tripped over your 2077. Burt, K6OQK At 09:00 AM 9/9/2013, time-nuts-requ...@febo.com wrote By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer ed_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-bounces@**febo.comtime-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS choices.
On 9/9/2013 11:08, Paul wrote: Although the inexpensive yet high sensitivity units are nice I'm not sure why someone would choose a positioning MTK (e.g. Adafruit) over a timing Ublox (or even an old Motorola style timing receiver). Am I missing something? In a word, availability. Try buying a NEO-6T in quantity of less than a reel (hundreds of pieces), for less than $180 (cost of a sample direct from u-blox). NEO-6M can be bought in small quantities on the grey market, for example aliexpress has dozens of such vendors. You also have many choices of evaluation board if you don't want the raw module. Good positioning modules like NEO-6M are more than sufficient for less demanding applications like NTP, and even have some timing features like sawtooth correction. It also has a stationary mode that isn't really position hold but at least tunes the algorithm to assume the antenna usually isn't moving. Also is the (up to) 10MHz output from a 6T as useful as it seems it should be given ~30/15ns quoted accuracy? Not sure but I suspect you wouldn't want to use it directly. Locking a OCXO to it would be trivial. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Possibly +2V for ECL Vcc and -3.2V for ECL Vee allowing it to drive 50 ohm loads connected to ground. Otherwise with 0V Vcc and -5.2V Vee the ECL loads must be connected to -2V (or its Thevenin equivalent) Bruce paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmered_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-bounces@**febo.comtime-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
I think there's lots of ECL in this thing. In 2012, Richard H McCorkle said that US Patent #6226231 was for part of the DTS-2075. It shows lots of ECL. My unit dates from around 2000 and doesn't have an obvious 3V3 supply, only 5V, 15V, and 24V. One of the 5V supplies might be adjusted for 5V2 and wired for negative voltage. I didn't check that. Ed On 9/9/2013 1:16 PM, paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer ed_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-bounces@**febo.comtime-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Lightning Strike Site
A cute little lightning detector based upon the AS3935 lightning detector chip: http://www.embeddedadventures.com/as3935_lightning_sensor_module_mod-1016.html ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS choices.
On Mon, Sep 9, 2013 at 2:33 PM, Michael Tharp g...@partiallystapled.com wrote: In a word, availability. Try buying a NEO-6T in quantity of less than a reel (hundreds of pieces), for less than $180 (cost of a sample direct from u-blox). I didn't mean to suggest only a 6T. I meant any timing quality device which might include a Ublox 6M, Trimble SMT or Moto UT+ compatible device. The 6T just happens to be extra special. On Mon, Sep 9, 2013 at 2:53 PM, David J Taylor david-tay...@blueyonder.co.uk wrote: It's a combination of availability, cost, power consumption, no extra power supplies needed, coupled with the engineering realisation that in my application (NTP on Linux, FreeBSD and Windows) I'll be highly unlikely to see the difference in accuracy between timing and navigation units. I'm assuming that *most* people here are interested in small quantities (10), possibly appreciative of a eval/proto/demo board and can deal with the power issues. Saying that better time is uninteresting because it's just for NTP seems a bit out of place among time-nuts. Better time is intrinsically interesting. Using recent examples I'm still not sure why you'd get the $40 Adafruit MTK versus the $70 ($35 quant. 1) Synergy Ublox. Unless you're like me and you just want a variety of devices. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Just trying to figure out why a 2V power supply pretty curious. Regards Paul. On Mon, Sep 9, 2013 at 3:57 PM, Ed Palmer ed_pal...@sasktel.net wrote: I think there's lots of ECL in this thing. In 2012, Richard H McCorkle said that US Patent #6226231 was for part of the DTS-2075. It shows lots of ECL. My unit dates from around 2000 and doesn't have an obvious 3V3 supply, only 5V, 15V, and 24V. One of the 5V supplies might be adjusted for 5V2 and wired for negative voltage. I didn't check that. Ed On 9/9/2013 1:16 PM, paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer ed_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-bounces@**fe**bo.comhttp://febo.com time-nuts-bounces@febo.**com time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
Re: [time-nuts] Lightning Strike Site
On 9/9/13 1:20 PM, Mark Sims wrote: A cute little lightning detector based upon the AS3935 lightning detector chip: http://www.embeddedadventures.com/as3935_lightning_sensor_module_mod-1016.html ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. A network of those and a decent GPS time hack and you could probably do fairly reasonable lightning stroke position measurement. to a first order, 1 microsecond would give you 300m precision, which is pretty good. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
-2V is a common terminator voltage for ECL In my days before gray hair I worked on a machine that for each rack had a 200A -2V power supply, a fully configured system had over 20 racks. On Mon, Sep 9, 2013 at 1:19 PM, paul swed paulsw...@gmail.com wrote: Just trying to figure out why a 2V power supply pretty curious. Regards Paul. On Mon, Sep 9, 2013 at 3:57 PM, Ed Palmer ed_pal...@sasktel.net wrote: I think there's lots of ECL in this thing. In 2012, Richard H McCorkle said that US Patent #6226231 was for part of the DTS-2075. It shows lots of ECL. My unit dates from around 2000 and doesn't have an obvious 3V3 supply, only 5V, 15V, and 24V. One of the 5V supplies might be adjusted for 5V2 and wired for negative voltage. I didn't check that. Ed On 9/9/2013 1:16 PM, paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer ed_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-bounces@**fe** bo.comhttp://febo.com time-nuts-bounces@febo.**com time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed
Re: [time-nuts] A day gone awry...
Ed, I can't remember where I ran across it, but a fellow preached a principle he called The Conservation of Bustedness. He posited that you can't have everything working all at once: if you fix the counter, the generator breaks; if you fix the generator, the dishwasher goes on the fritz; fix the dishwasher, and the car won't start - you get the picture... ;-) 73, geo - n4ua On Mon, Sep 9, 2013 at 4:41 PM, Ed Palmer ed_pal...@sasktel.net wrote: It could have been from grinding my teeth in frustration at buying a dead unit! :) My money's on the 'bad luck comes in threes' legend. I had good luck fixing the DTS-2077 so I had to pay for it with 3 bad things. How's that for unscientific thinking? :) Ed On 9/9/2013 11:27 AM, paul swed wrote: OK I don't get it. When I search for a 2077 I get some online game. Now it makes sense that thats a time sink but generally nothing that will break a tooth. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 12:48 PM, Ed Palmer ed_pal...@sasktel.net wrote: At least I didn't drop it on my foot! :) Ed On 9/9/2013 10:10 AM, Burt I. Weiner wrote: Wow! Sorry to hear that you tripped over your 2077. Burt, K6OQK At 09:00 AM 9/9/2013, time-nuts-requ...@febo.com wrote By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Yes indeed it would be reasonable. The good news is that if you have a dead short supply for 2V those are the easiest to troubleshoot. Fixed numbers of pieces of test equipment because of faulty caps that shorted. On Mon, Sep 9, 2013 at 4:42 PM, Ed Palmer ed_pal...@sasktel.net wrote: That's possible. The only outputs are the CAL1 and CAL2 signals which are square waves at -0V4 and -0v8 into 50 ohms at 8KHz, 1MHz, or 200MHz and the oscillator monitor output at 100 MHz. My spectrum analyzer suggests that it's a square wave. The DTS measures it as +0V2124 and -0V2154. It wouldn't be hard to generate the -3V2 for those locally from -5V0. Ed On 9/9/2013 1:43 PM, Bruce Griffiths wrote: Possibly +2V for ECL Vcc and -3.2V for ECL Vee allowing it to drive 50 ohm loads connected to ground. Otherwise with 0V Vcc and -5.2V Vee the ECL loads must be connected to -2V (or its Thevenin equivalent) Bruce paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmered_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-bounces@**fe** bo.com http://febo.comtime-nuts-bounces@febo.**comtime-nuts-boun...@febo.com ] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed
Re: [time-nuts] Wavecrest DTS 2070
That's possible. The only outputs are the CAL1 and CAL2 signals which are square waves at -0V4 and -0v8 into 50 ohms at 8KHz, 1MHz, or 200MHz and the oscillator monitor output at 100 MHz. My spectrum analyzer suggests that it's a square wave. The DTS measures it as +0V2124 and -0V2154. It wouldn't be hard to generate the -3V2 for those locally from -5V0. Ed On 9/9/2013 1:43 PM, Bruce Griffiths wrote: Possibly +2V for ECL Vcc and -3.2V for ECL Vee allowing it to drive 50 ohm loads connected to ground. Otherwise with 0V Vcc and -5.2V Vee the ECL loads must be connected to -2V (or its Thevenin equivalent) Bruce paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmered_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-bounces@**febo.comtime-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] A day gone awry...
It could have been from grinding my teeth in frustration at buying a dead unit! :) My money's on the 'bad luck comes in threes' legend. I had good luck fixing the DTS-2077 so I had to pay for it with 3 bad things. How's that for unscientific thinking? :) Ed On 9/9/2013 11:27 AM, paul swed wrote: OK I don't get it. When I search for a 2077 I get some online game. Now it makes sense that thats a time sink but generally nothing that will break a tooth. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 12:48 PM, Ed Palmer ed_pal...@sasktel.net wrote: At least I didn't drop it on my foot! :) Ed On 9/9/2013 10:10 AM, Burt I. Weiner wrote: Wow! Sorry to hear that you tripped over your 2077. Burt, K6OQK At 09:00 AM 9/9/2013, time-nuts-requ...@febo.com wrote By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving me trouble, I broke a big chunk off a tooth and am now scheduled for a crown at a cost of about $1000, and my big-screen TV died! :( Ed ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Is 200 amperes @ 2v not lethal? -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Tuesday, 10 September 2013 6:58 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 -2V is a common terminator voltage for ECL In my days before gray hair I worked on a machine that for each rack had a 200A -2V power supply, a fully configured system had over 20 racks. On Mon, Sep 9, 2013 at 1:19 PM, paul swed paulsw...@gmail.com wrote: Just trying to figure out why a 2V power supply pretty curious. Regards Paul. On Mon, Sep 9, 2013 at 3:57 PM, Ed Palmer ed_pal...@sasktel.net wrote: I think there's lots of ECL in this thing. In 2012, Richard H McCorkle said that US Patent #6226231 was for part of the DTS-2075. It shows lots of ECL. My unit dates from around 2000 and doesn't have an obvious 3V3 supply, only 5V, 15V, and 24V. One of the 5V supplies might be adjusted for 5V2 and wired for negative voltage. I didn't check that. Ed On 9/9/2013 1:16 PM, paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer ed_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-bounces@**fe** bo.comhttp://febo.com time-nuts-bounces@febo.**com time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primaries on decent size line transformers only have something ike 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs heavier than mine. Linear supplies - that would do it! The expanded/exploded capacitors could be just from age, or they could be from an output fault on the power supply that caused the voltage to go high. That's why I would have tested both power supplies offline. You said it's alive, but you haven't mentioned if it actually works. By the way,
Re: [time-nuts] Wavecrest DTS 2070
On 9/9/13 2:21 PM, Mark C. Stephens wrote: Is 200 amperes @ 2v not lethal? Not particularly.. any more than putting your fingers across a 1.5 or 3V battery is lethal. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Ah so the sparks scare you to death, well I can relate to that :) I fear we deviate off course Bob.. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Tuesday, 10 September 2013 7:39 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Only if whatever shorts it vaporizes violently enough to kill you. When I worked at Burroughs in the 70s, I heard stories about low volts/high amps hijinks. Bob From: Mark C. Stephens ma...@non-stop.com.au To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, September 9, 2013 4:21 PM Subject: Re: [time-nuts] Wavecrest DTS 2070 Is 200 amperes @ 2v not lethal? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] A day gone awry...
It looks like The Conservation of Bustedness came from Usenet. http://rec.crafts.metalworking.narkive.com/66UwVxf4/conservation-of-bustedness But doesn't entropy mean that the amount of Bustedness in the universe keeps increasing? Hell, I might as well quit. I can't win! Ed On 9/9/2013 2:47 PM, George Dubovsky wrote: Ed, I can't remember where I ran across it, but a fellow preached a principle he called The Conservation of Bustedness. He posited that you can't have everything working all at once: if you fix the counter, the generator breaks; if you fix the generator, the dishwasher goes on the fritz; fix the dishwasher, and the car won't start - you get the picture... ;-) 73, geo - n4ua On Mon, Sep 9, 2013 at 4:41 PM, Ed Palmer ed_pal...@sasktel.net wrote: It could have been from grinding my teeth in frustration at buying a dead unit! :) My money's on the 'bad luck comes in threes' legend. I had good luck fixing the DTS-2077 so I had to pay for it with 3 bad things. How's that for unscientific thinking? :) Ed On 9/9/2013 11:27 AM, paul swed wrote: OK I don't get it. When I search for a 2077 I get some online game. Now it makes sense that thats a time sink but generally nothing that will break a tooth. Regards Paul WB8TSL ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
I have seen a 12v car battery and a wire frame bed to torture victims on television twice now. Are you telling me that's bunk?! (pardon the pun) -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Jim Lux Sent: Tuesday, 10 September 2013 7:24 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Wavecrest DTS 2070 On 9/9/13 2:21 PM, Mark C. Stephens wrote: Is 200 amperes @ 2v not lethal? Not particularly.. any more than putting your fingers across a 1.5 or 3V battery is lethal. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] New NTBW50AA
Hi On Sep 9, 2013, at 9:14 AM, quartz55 quart...@hughes.net wrote: Wait a minute, Bob. I have an LPRO with good reported bulb voltatge. Are you telling me this TBolt is no better than the Rb standard, as far as stability and perhaps worse? It may not or may not be any more stable than your LPRO. You can not determine from the LH ADEV if it is or isn't. And the frequency accuracy is also no better and both have to be compared to a Cs or H Maser to be calibrated? Frequency accuracy and frequency stability are two different things. A source that swings +/- 2 ppb a day, but *average* to zero is accurate, but not stable. I thought the GPS put out these precise second pulses that the TBolt would measure over time and discipline the OCXO to those precision seconds over time resulting in a variable (very small) but precise statistical frequency The jitter in the GPS pulses is the issue. Your GPS may be flopping around by many ns each second. That's many ppb before you do any averaging. (unlike the Rb which is just very stable) ….. and thus is a good way to help answer how stable is my GPSDO ... and thus having a reference back to NIST to a degree. (in my simplistic language) Yes, I'm not fully understanding the Tau and ADEV I'm sure. I did read it's the sq root of Allan variance. So the reported 1 Tau ADEV is not a measurement of the variance of the frequency compared to the precise 1 second marks over time? Assuming LH is reporting 10,000 second ADEV as 1 tau then it's the ADEV correctly calculated for the GPS looking at the GPS disciplined OCXO. Since one is following the other it's like saying your counter is exactly right because it reads 10.0 MHz when you plug the reference output on the back of the counter into the input jack on the front of it. In order to do it correctly you need to compare to *independent* sources. I thought if I had 1.0e-12 that was comparable to knowing it's within 1Hz at a billion (10^12) Hz? Since it's ADEV you have a standard deviation of frequency change between 10,000 second samples of 1 ppt. Standard deviation isn't the same as mean. Should I reverse the a command I did and let it run in the mode I got it in? The 1 ADEV is back down to 1.6e-12 this morning. You can see the screenshot here, http://s251.photobucket.com/user/DogTi/media/time/20139-91229_zps7e475453.jpg.html it looks like the temp is still jumping but for some reason the number of sats has increased, a lot, maybe it's just the harmonic convergence. Again, you are checking your yardstick against it's self. Check it 10,000 times and average the results. The average error will be very small. That does not really say much about how accurate it is or if it changes length when the humidity goes up. Is that white line that runs around the center essentially the frequency variance? And why do I have what appears to be multiple blue and red lines? White corresponds to the words in white just above the graph. It's running frequency. More or less, it's how much the frequency is jumping around. I have no idea why the dual ADEV lines. There is also a trace set to dark grey on your plot that shows the pps moving around. Bob So many questions, so little time. Anyhow, as soon as it warms up a bit and I have my Earl Grey, I'm going to turn this thing off and go reset the antenna and see what happens, I need to make a bracket which won't take long. I just worry about climbing up the ladder these days since I had a herniated disc removed and a spacer installed this spring. At least the pain is gone and I'm not in a wheelchair. Dave N3DT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Lethal was dropping a conductor across the buss bars. If it was not the -2V it was -5.2V. I can't remember but it was at least 75A more like 100A. The power supplies were in the bottom of the cabinets and tin plated copper buss bars would run up the side of the back planes. The back planes where wire wrapped and we were suppose to shut the power off when making a change. A bit of 30 gauge wire didn't matter but a manual wire wrap tool made some pretty interesting sparks. That caused a fault. Another had metal framed glasses. Did not even cause a hiccup to the test program that was running. Ah the good days of CML, Current Mode Logic. at Burroughs. -pete On Mon, Sep 9, 2013 at 2:21 PM, Mark C. Stephens ma...@non-stop.com.auwrote: Is 200 amperes @ 2v not lethal? -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Tuesday, 10 September 2013 6:58 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 -2V is a common terminator voltage for ECL In my days before gray hair I worked on a machine that for each rack had a 200A -2V power supply, a fully configured system had over 20 racks. On Mon, Sep 9, 2013 at 1:19 PM, paul swed paulsw...@gmail.com wrote: Just trying to figure out why a 2V power supply pretty curious. Regards Paul. On Mon, Sep 9, 2013 at 3:57 PM, Ed Palmer ed_pal...@sasktel.net wrote: I think there's lots of ECL in this thing. In 2012, Richard H McCorkle said that US Patent #6226231 was for part of the DTS-2075. It shows lots of ECL. My unit dates from around 2000 and doesn't have an obvious 3V3 supply, only 5V, 15V, and 24V. One of the 5V supplies might be adjusted for 5V2 and wired for negative voltage. I didn't check that. Ed On 9/9/2013 1:16 PM, paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer ed_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-bounces@**fe** bo.comhttp://febo.com time-nuts-bounces@febo.**com time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement
Re: [time-nuts] Wavecrest DTS 2070
Only if whatever shorts it vaporizes violently enough to kill you. When I worked at Burroughs in the 70s, I heard stories about low volts/high amps hijinks. Bob From: Mark C. Stephens ma...@non-stop.com.au To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, September 9, 2013 4:21 PM Subject: Re: [time-nuts] Wavecrest DTS 2070 Is 200 amperes @ 2v not lethal? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] New NTBW50AA
Hi On Sep 9, 2013, at 1:56 PM, quartz55 quart...@hughes.net wrote: I moved the antenna, and did a new standard survey which took an hour and then another 5 minutes or so to lock. The sats don't seem to be any less right under the trees. You can see the antenna and trees here. http://s251.photobucket.com/user/DogTi/library/time?sort=3page=1 I'll let it run and check on it now and then. Now if I had the XRef from VK3HZ. Unless I'm looking at the pictures wrong, you still have a lot of trees around the antenna. An ideal setup would be clear of obstruction to within 10 degrees of the horizon from about NE around through due S and back up to NW. It's rare that you get 100% of that ideal. If you are obstructed to 45 degrees over most of that range the TBolt will be struggling at certain times of day. It'll struggle more when it's raining if the issue is trees. This thing seems much more accurate than the Nuvi we have. It puts the antenna right on google where it actually is. That's more a matter of luck than anything else. Google maps isn't all that accurate. I wish I could move this antenna around and do a bit of surveying with it. I've got a couple property lines I'm not sure where it is except in a general way. Your property line may or may not be defined in same reference frame GPS uses. You'll have to do some research on how it's defined. Like the end points, but the line in between is about a half mile and through the woods so you can't see line of sight. Can someone tell me where to go to read about the items that are listed in LH? The best way is to take a look at the source code. The other way is to just poke at it and see what comes up. Bob Dave N3DT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Lightning Strike Site (Jim Lux)
I played around a little with the AS3935 development kits in the hopes of doing just what Mark suggested--putting together an array of lightning detectors with GPS time stamp, using the PICTIC+ time-stamper designed by Richard McCorkle. We already have a global array of cosmic-ray detectors, and some of my students want to see if we can find a correlation between lightning and cosmic-ray air showers. I was hoping that the AS3935 had a pulse output synchronous with detecting a lightning discharge, but the only output is serial data, which seriously limits the time-stamp precision. I'd love to hear if anyone has any ideas for getting a low-latency TTL output from this detector. Tom Bales Date: Mon, 09 Sep 2013 13:45:07 -0700 From: Jim Lux jim...@earthlink.net To: time-nuts@febo.com Subject: Re: [time-nuts] Lightning Strike Site Message-ID: 522e3353.4020...@earthlink.net Content-Type: text/plain; charset=ISO-8859-1; format=flowed On 9/9/13 1:20 PM, Mark Sims wrote: A cute little lightning detector based upon the AS3935 lightning detector chip: http://www.embeddedadventures.com/as3935_lightning_sensor_module_mod-1016.html ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. A network of those and a decent GPS time hack and you could probably do fairly reasonable lightning stroke position measurement. to a first order, 1 microsecond would give you 300m precision, which is pretty good. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
On 9/9/13 2:38 PM, Mark C. Stephens wrote: I have seen a 12v car battery and a wire frame bed to torture victims on television twice now. Are you telling me that's bunk?! (pardon the pun) As someone who used to make their living doing just such physical effects for film and TV.. It's a special made for TV battery(!) (typically with a connection to something else inside, so you can make really nice scary sparks) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightning Strike Site (Jim Lux)
On 9/9/13 3:52 PM, Mark Sims wrote: The AS3935 has an INT output pin that signals a detection. You could monitor that. The AS3935 is based upon an internal DSP processing the receiver output. No telling how long between when the strike occurs and when INT is activated. I'd send a nice note to the folks in Austria who make the part and ask them. I suspect, also, that you might be able to figure out some other lightning sensor electronics: the Boltek unit wasn't all that complex, looking at the PC board, but I didn't have a schematic. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Lightning Strike Site (Jim Lux)
The AS3935 has an INT output pin that signals a detection. You could monitor that. The AS3935 is based upon an internal DSP processing the receiver output. No telling how long between when the strike occurs and when INT is activated. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] New NTBW50AA
Look at the comments at the start of the heather.cpp in your Lady Heather installation directory for what there is of ducumentation. Your temperature readings are bouncing around because the temperature sensor is only providing readings quantized to 1 degree C. This is usually due to the GPSDO firmware not being compatible with an undocumented change Dallas Semi made to later revs of their temp sensor chips. NTPX series GPSDO's don't do high res readings even with the earlier rev temp sensor chips. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
You have some cml in the basement right? Regards Paul On Mon, Sep 9, 2013 at 5:51 PM, Pete Lancashire p...@petelancashire.comwrote: Lethal was dropping a conductor across the buss bars. If it was not the -2V it was -5.2V. I can't remember but it was at least 75A more like 100A. The power supplies were in the bottom of the cabinets and tin plated copper buss bars would run up the side of the back planes. The back planes where wire wrapped and we were suppose to shut the power off when making a change. A bit of 30 gauge wire didn't matter but a manual wire wrap tool made some pretty interesting sparks. That caused a fault. Another had metal framed glasses. Did not even cause a hiccup to the test program that was running. Ah the good days of CML, Current Mode Logic. at Burroughs. -pete On Mon, Sep 9, 2013 at 2:21 PM, Mark C. Stephens ma...@non-stop.com.au wrote: Is 200 amperes @ 2v not lethal? -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Tuesday, 10 September 2013 6:58 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 -2V is a common terminator voltage for ECL In my days before gray hair I worked on a machine that for each rack had a 200A -2V power supply, a fully configured system had over 20 racks. On Mon, Sep 9, 2013 at 1:19 PM, paul swed paulsw...@gmail.com wrote: Just trying to figure out why a 2V power supply pretty curious. Regards Paul. On Mon, Sep 9, 2013 at 3:57 PM, Ed Palmer ed_pal...@sasktel.net wrote: I think there's lots of ECL in this thing. In 2012, Richard H McCorkle said that US Patent #6226231 was for part of the DTS-2075. It shows lots of ECL. My unit dates from around 2000 and doesn't have an obvious 3V3 supply, only 5V, 15V, and 24V. One of the 5V supplies might be adjusted for 5V2 and wired for negative voltage. I didn't check that. Ed On 9/9/2013 1:16 PM, paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer ed_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of a job to get it out? Well, I described my process in the teardown. Is your board similar? Other than the front panel stuff, board removal is just a matter of unplugging connectors and unscrewing the mounting screws. All the PSU screw heads are under it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message-
[time-nuts] Lightning detectors
On 9/9/13 4:08 PM, Jim Lux wrote: On 9/9/13 3:52 PM, Mark Sims wrote: The AS3935 has an INT output pin that signals a detection. You could In an interesting coincidence, Charles Wenzel (yes, that Wenzel) has a design for a lightning detector: http://www.techlib.com/electronics/lightning.html http://www.techlib.com/electronics/lightningnew.htm I didn't see any references to the effect of the copper nails in wood on the phase noise or Allan deviation of the circuit. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
I used to work for a telephone company. Our big sites had power plants that put out -48V at a few thousand amps. If you dropped a wrench across the buss bars, the wrench disappeared in a puff of smoke and a helluva bang. We were also warned about wearing rings or watches when working on the equipment. You could grab the buss bar with your bare hands and not feel a thing. 48V isn't high enough to be dangerous. But if your ring shorted between battery and ground, the ring would burn your finger off and cauterize the wound. I decided that I would accept these stories on faith rather than test them for myself. :) Ed On 9/9/2013 3:51 PM, Pete Lancashire wrote: Lethal was dropping a conductor across the buss bars. If it was not the -2V it was -5.2V. I can't remember but it was at least 75A more like 100A. The power supplies were in the bottom of the cabinets and tin plated copper buss bars would run up the side of the back planes. The back planes where wire wrapped and we were suppose to shut the power off when making a change. A bit of 30 gauge wire didn't matter but a manual wire wrap tool made some pretty interesting sparks. That caused a fault. Another had metal framed glasses. Did not even cause a hiccup to the test program that was running. Ah the good days of CML, Current Mode Logic. at Burroughs. -pete On Mon, Sep 9, 2013 at 2:21 PM, Mark C. Stephens ma...@non-stop.com.auwrote: Is 200 amperes @ 2v not lethal? -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Tuesday, 10 September 2013 6:58 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 -2V is a common terminator voltage for ECL In my days before gray hair I worked on a machine that for each rack had a 200A -2V power supply, a fully configured system had over 20 racks. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Somewhere in the depths of boxes (if no lost is a fire about 25 yrs ago) are a few B7700, BSP and AFP boards that followed me home. The BCM chips my guess are now quite rare., Some of the boards have (had?) Motorola ECL. -pete On Mon, Sep 9, 2013 at 3:42 PM, paul swed paulsw...@gmail.com wrote: You have some cml in the basement right? Regards Paul On Mon, Sep 9, 2013 at 5:51 PM, Pete Lancashire p...@petelancashire.com wrote: Lethal was dropping a conductor across the buss bars. If it was not the -2V it was -5.2V. I can't remember but it was at least 75A more like 100A. The power supplies were in the bottom of the cabinets and tin plated copper buss bars would run up the side of the back planes. The back planes where wire wrapped and we were suppose to shut the power off when making a change. A bit of 30 gauge wire didn't matter but a manual wire wrap tool made some pretty interesting sparks. That caused a fault. Another had metal framed glasses. Did not even cause a hiccup to the test program that was running. Ah the good days of CML, Current Mode Logic. at Burroughs. -pete On Mon, Sep 9, 2013 at 2:21 PM, Mark C. Stephens ma...@non-stop.com.au wrote: Is 200 amperes @ 2v not lethal? -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Tuesday, 10 September 2013 6:58 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 -2V is a common terminator voltage for ECL In my days before gray hair I worked on a machine that for each rack had a 200A -2V power supply, a fully configured system had over 20 racks. On Mon, Sep 9, 2013 at 1:19 PM, paul swed paulsw...@gmail.com wrote: Just trying to figure out why a 2V power supply pretty curious. Regards Paul. On Mon, Sep 9, 2013 at 3:57 PM, Ed Palmer ed_pal...@sasktel.net wrote: I think there's lots of ECL in this thing. In 2012, Richard H McCorkle said that US Patent #6226231 was for part of the DTS-2075. It shows lots of ECL. My unit dates from around 2000 and doesn't have an obvious 3V3 supply, only 5V, 15V, and 24V. One of the 5V supplies might be adjusted for 5V2 and wired for negative voltage. I didn't check that. Ed On 9/9/2013 1:16 PM, paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer ed_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series are a hoot :) so overdone but the Dalek's back then couldn't fly... I remember watching it when it was new in the early '60's. Scary. Only 1000 for a crown, It would be cheaper for me to fly to Canada to get crown My last crown was disaster as a result the clown that put the crown in stuffed up and the crown snapped off at the root So added to the $2400 for the crown, I am now up for around 7K for an implant. Geez, I hope I don't follow in your footsteps! Your 'parallel lives' comment now has me really worried. The standby PSU tranny is dead short, zero ohm as compared to the 2v/6A supplies 8-10 ohm. Any idea what that 2V supply is for?, Sorry, no clue. But my mainboard has a +2.1 volt test point so there's certainly a 'family resemblance' between our units. Mine must generate the +2.1 volts on the mainboard. If I can lose the 2 linear PSU, I'll lose a ton of weight, but possibly at the expense of electrical noise. I was thinking that is why they used optics between the control board - to keep spurious noise to a minimum. Yes, but I would have thought that optoisolators would have been cheaper than optical transmitters, receivers, and cables. Yeah, I did play roulette by powering it up like that but I was a tad annoyed as I was told it was a working unit. The bottom board on this one has millions of tiny surface mount caps mounted on there sides. It looks terribly fragile. Much of
Re: [time-nuts] Lightning Strike Site (Jim Lux)
Come on fellas it can't be that difficult to input a pulse to the chip and measure the prop delay to the INT pin this is timenuts after all :-)) Alan G3NYK - Original Message - From: Jim Lux jim...@earthlink.net To: time-nuts@febo.com Sent: Tuesday, September 10, 2013 12:08 AM Subject: Re: [time-nuts] Lightning Strike Site (Jim Lux) On 9/9/13 3:52 PM, Mark Sims wrote: The AS3935 has an INT output pin that signals a detection. You could monitor that. The AS3935 is based upon an internal DSP processing the receiver output. No telling how long between when the strike occurs and when INT is activated. I'd send a nice note to the folks in Austria who make the part and ask them. I suspect, also, that you might be able to figure out some other lightning sensor electronics: the Boltek unit wasn't all that complex, looking at the PC board, but I didn't have a schematic. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Wavecrest DTS 2070
Ed wrote: You could grab the buss bar with your bare hands and not feel a thing. 48V isn't high enough to be dangerous. It all depends on the current drawn through the body (and especially, through one's heart). Therefore, it depends on the point-to-point resistance through the body between contact points, and whether the current path runs through the heart. Much (most) of that resistance is between the skin's surface and the flesh just beneath the skin. If the skin is punctured so the contact goes straight to the flesh beneath the skin, or the contact patch is very large, or the skin is wet (especially with salt water), or a combination of the above, you can get lethal current with much less than the voltage normally required (i.e., dry skin, small contact points, etc.). Best regards, Charles ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] New NTBW50AA
OK, did a bit more reading. I already understand the difference between accuracy and stability however. I thought ADEV was some sort of measurement of accuracy, but I understand now it is a measure of stability over time. I'm supposing now that I can assume that the best frequency accuracy I can imagine is what is specked in the book for the unit, .8x10^-10. That should be good enough for me. Although most seem to say the GPSDO units are good for .1Hz at 10GHz which I think would be 10^-13 no? Yeah, I've read through the h...cpp and a lot of it is greek to me, I'm no programmer, but I can pull a bunch of stuff out of it. But it doesn't explain the acronyms or the meanings of them. I've lowered the el mask to 20 and I get plenty of sats now. When it was at 43, lots of times it was down to 2, now it's generally up to 6. I'll see how it does, especially if it rains, and yes the trees really cover the antenna. I am getting 30-40 or more dBc however which is what I had when it was more in the clear. I can move it to the west about 30' on the chimney where my UHF/VHF beams are and it's a lot more open straight up and especially to the south. The position where it is now is just real convenient and it's only maybe 25' from the unit. Plus I didn't have to get up on that part of the roof that's 7 in 12. Yes, I notice the gis for our county seems to have a slightly different co-ordinate system, they don't line up with google or the GPS which seem to agree as far as I can zoom in on our location. I'd say the GPS and google are within a foot or 2. I guess I can just turn off the temp chart if it's not going to report right and stop looking/worrying about it. As long as the green lock light is on. I wonder if I could trick the Nortel unit into thinking it's seeing the CM though, so the top green light would come on instead of the yellow one. But that doesn't matter. Thanks for all your help, I'll hang around for a while. Dave N3DT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] New NTBW50AA
I have a slightly earlier version, or a close cousin, of the NTBW50AA that I modified and I've posted photos of it on this list before: http://i906.photobucket.com/albums/ac262/rjb1998/NTPB15AA05.jpg The LH plot from the NTBW50AA by quartz55 doesn't look quite right. Here is a LH plot from my NTPB15AA unit with most of the scale factors set the same as the scale factor in the plot from the NTBW50AA to make it easier to compare. http://i906.photobucket.com/albums/ac262/rjb1998/NTPB15A_zps19b3bd33.jpg If you look at the temp plot from my unit it has small steps and is what I'd expect to see. The plot from the NTBW50AA looks like it has some smaller steps but it looks like it hits a limit at 36.750 and doesn't go beyond that value, which isn't right. It looks like a higher order bit is being turned on and off randomly causing the large apparent jump in temp, which probably isn't really happening because some of the other traces would be affected by any real jump that large. You could just ignore it because it would probably only have an effect during carryover. The NTBW50AA oscillator probably hasn't settled down yet because the DAC voltage is changing a lot more than mine and the 10Mhz doesn't look anywhere near as stable. The design of the 2 units appears nearly identical so I'd expect similar performance. Also the OSC ADEV at 1 tau isn't close to what mine appears to be. That may improve after the unit has been on for a month or so but the temp plot just doesn't look right so the sensor may be bad. -Arthur ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS choices.
From: Paul [] Using recent examples I'm still not sure why you'd get the $40 Adafruit MTK versus the $70 ($35 quant. 1) Synergy Ublox. Unless you're like me and you just want a variety of devices. === Paul, Try comparing costs when shipped the UK, versus buying a locally sourced Adafruit module. May be different in the US. It still consumes more power, takes more effort to interface to the Raspberry Pi, results in a bigger overall assembly, doesn't come with an antenna, and you can't realistically use the extra precision in NTP etc. etc. Engineering-wise, it's an unnecessary extra expense. But I have one just for fun, and as a reference against which others might be compared. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] DTS-2077 Very Cool Toy!
I fed a 1 GHz sine wave @ 0 dBm into the DTS-2077. I told the DTS to sample the voltage every 10 ps and dump the data to a file. The attached graph shows the result. The horizontal axis is samples (i.e. increments of 10 ps). The vertical axis is units of 100 uv. I've got a digital scope with a sampling rate of 100 GS/s! Very cool! Ed attachment: DTS 1GHz.png___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
