Re: [time-nuts] Lightsquared questionfor SFO area....
This is one well documented example of an earlier unintentional jamming incident. _http://www.gpsworld.com/gnss-system/signal-processing/the-hunt-rfi-776_ (http://www.gpsworld.com/gnss-system/signal-processing/the-hunt-rfi-776) Regards Nigel GM8PZR In a message dated 28/07/2012 02:43:23 GMT Daylight Time, wa1...@att.net writes: Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. -Brian, WA1ZMS ___ 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] Lightsquared questionfor SFO area....
Nigel- I remember that event. This issue I'm remotely dealing with now seems to be limited to a specific local area bounded by a few km. So local QRM is possible. On Saturday the techs will install all new GPS antennas with integrated band-pass filters. Conf call on Saturday night at 6pm my time will produce more date. -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com Sent: Saturday, July 28, 2012 2:27 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Lightsquared questionfor SFO area This is one well documented example of an earlier unintentional jamming incident. _http://www.gpsworld.com/gnss-system/signal-processing/the-hunt-rfi-776_ (http://www.gpsworld.com/gnss-system/signal-processing/the-hunt-rfi-776) Regards Nigel GM8PZR In a message dated 28/07/2012 02:43:23 GMT Daylight Time, wa1...@att.net writes: Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. -Brian, WA1ZMS ___ 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] Lightsquared questionfor SFO area....
Hi Brian: Would you please let me know which antennas they will be using and if this solves the problem? Thanks, Ron -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Brian, WA1ZMS Sent: Friday, July 27, 2012 11:55 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Lightsquared questionfor SFO area Nigel- I remember that event. This issue I'm remotely dealing with now seems to be limited to a specific local area bounded by a few km. So local QRM is possible. On Saturday the techs will install all new GPS antennas with integrated band-pass filters. Conf call on Saturday night at 6pm my time will produce more date. -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com Sent: Saturday, July 28, 2012 2:27 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Lightsquared questionfor SFO area This is one well documented example of an earlier unintentional jamming incident. _http://www.gpsworld.com/gnss-system/signal-processing/the-hunt-rfi-776_ (http://www.gpsworld.com/gnss-system/signal-processing/the-hunt-rfi-776) Regards Nigel GM8PZR In a message dated 28/07/2012 02:43:23 GMT Daylight Time, wa1...@att.net writes: Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. -Brian, WA1ZMS ___ 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] Lightsquared questionfor SFO area....
We have about 25 different GPSDOs running from four cheap antennae on the roof in Los Gatos right next to Hwy 17, and have not noted any unusual outages at all, even during the recent solar flare. I guess any truckers with jammers on hwy 17 pass by so fast we don't notice anything. Bye, Said Sent from my iPad On Jul 27, 2012, at 22:18, Brian, WA1ZMS wa1...@att.net wrote: Jim- That's one thing I was afraid of, but did not yet mention to our mgmt. team. But if Light squared lost their Part 5 license, then I can take them off the list. It's a complicated problem that due to the nature of it, I cannot discuss on the reflector. But I'm involved via remote reporting from techs out in the field and their daily reports and conference calls. So I just need to due engineering diligence as I try and help them. I expect my butt will be on a plane next week unless I can identify a 3rd party vendor equipment problem. THANKS! -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Jim Lux Sent: Saturday, July 28, 2012 12:35 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Lightsquared questionfor SFO area On 7/27/12 6:42 PM, Brian, WA1ZMS wrote: Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? Very unlikely.. they've lost their experimental license. I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. there are myriad sources of interference out there. Jammers are a BIG problem in urban areas (truckers and cab drivers use them to defeat their GPS based tracking systems and time clocks). there's a great set of articles over the past few months in GPS World about it. -Brian, WA1ZMS ___ 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] 5MHz ocxo- Opening Solder sealed cans
Silver solder has a higher melting temperature so make sure you adjust your soldering iron to the right temperature otherwise you will just make another cold joint. Also wick all the old solder before making a new joint with different solder. Didier KO4BB Ron Ward n6idl...@comcast.net wrote: Hi: I have been looking at the poor quality solder joints on the oscillator. If you have a steady hand and a small tipped soldering with silver baring (about 2% silver) solder, I would re-solder the connections. Many of them do not look properly wetted and cold. Some of the heat from removing the top may have re-soldered a problem connection. Ron -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Paul Flinders Sent: Thursday, July 26, 2012 2:59 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 5MHz ocxo- Opening Solder sealed cans On 26/07/12 20:49, Tom Miller wrote: Pick up a few sticks of ChipQuik and mix it in with a good iron. Then, you may do just what you say. It should melt below about 95°C. A good hot air heat gun would most likely do the trick. Maybe use some solder wick first to lower the amount of tin/lead solder. Then add the chipquik. You might also just solder a tab on the bottom then you could clamp the top in a leather jawed vise. Hit it with a hot air gun while pulling on the base tab. Well, a few exploratory attempts confirmed my initial suspicion that I don't have a soldering iron big enough for the job - the largest I have is 60W or so, and the hot air gun didn't touch it even set to 480deg C So, I reached for the next larger source of heat which is a small blowtorch I have, set a small flame and ran it round the whole seam then pulled the top off with a gloved hand. Things did get a bit warm but only for a short while. The first thing I encountered was some insulating foam - this was rather sticky. Not sure whether it had gone like that over time or due to my heating the whole thing a bit too much. On three sides the foam was separated from the case by what looks like some thin SRBP. This had blistered a bit so obviously things were a bit hot just there but the foam was much the same whether protected by the SRBP so I'm wondering whether this has just disintegrated over time. Pulling/washing the foam off reveals three PCBs and a further enclosed metal case with the crystal. A TIP21 bolted to this acts as the heating element. Originally there had been some cable ties anchoring the crystal enclosure but these were brittle - presumably from the heat of the oven. Hooking the unit up to 12V and an oscilloscope shows that it has survived the encounter with the blow torch and produces a nice 5MHz sine wave at 2.5V p-p (into 10Meg ohm). Irritatingly it doesn't really want to misbehave - presumably because whatever didn't like the heat is now cooler with the insulating foam removed. The inner metal case gets too hot to touch but the thermostat seems to be working because the current drawn drops from about 380mA to 240 or so. It should probably be lower but, again, without the usual amount of insulation it's likely to draw more keeping the oven up to temperature. So, as it doesn't want to misbehave, I'm not totally clear which way to go. The output does drop to about 1.8V p-p when the oven is fully warm which might be related to the original fault. I suppose the fact that the fault has gone away eliminates the oven assembly or crystal itself as the source of the problem. Photos for comments or curiosity. The black stuff all over the PCBs is the remains of the foam. http://www.wild-pc.co.uk/images/P1020364.jpg http://www.wild-pc.co.uk/images/P1020367.jpg http://www.wild-pc.co.uk/images/P1020368.jpg http://www.wild-pc.co.uk/images/P1020369.jpg http://www.wild-pc.co.uk/images/P1020370.jpg ___ 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. -- Sent from my Motorola Droid Razr phone with K-9 Mail. Please excuse my brevity. ___ 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] Lightsquared questionfor SFO area....
Brian, I have four GPSDO systems running and logging on a hill West of Redwood City with a view of the South Bay. Let me know if I can help. Craig McCartney 160 Montalvo Road Palomar Park, CA 94062 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Brian, WA1ZMS Sent: Friday, July 27, 2012 6:43 PM To: Time-Nuts Subject: [time-nuts] Lightsquared questionfor SFO area Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. -Brian, WA1ZMS ___ 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] Lightsquared questionfor SFO area....
On 7/28/12 1:32 AM, Said Jackson wrote: We have about 25 different GPSDOs running from four cheap antennae on the roof in Los Gatos right next to Hwy 17, and have not noted any unusual outages at all, even during the recent solar flare. I guess any truckers with jammers on hwy 17 pass by so fast we don't notice anything. I think the notable problems at Newark airport were because the jammer containing vehicles were sitting around in one place. http://www.gpsworld.com/government/personal-privacy-jammers-12837 is one among many articles about it. ___ 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] Lightsquared questionfor SFO area....
The filters won't help with intentional on-frequency jamming. I assume the filters are there to reduce the effect of out of band signals on the AGC. (As the hams say, desense.) It seems to me a good market for next generation GPSs is spoof and/or RFI detection. -Original Message- From: Ron Ward n6idl...@comcast.net Sender: time-nuts-boun...@febo.com Date: Sat, 28 Jul 2012 00:32:46 To: wa1...@att.net; 'Discussion of precise time and frequency measurement'time-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Lightsquared questionfor SFO area Hi Brian: Would you please let me know which antennas they will be using and if this solves the problem? Thanks, Ron -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Brian, WA1ZMS Sent: Friday, July 27, 2012 11:55 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Lightsquared questionfor SFO area Nigel- I remember that event. This issue I'm remotely dealing with now seems to be limited to a specific local area bounded by a few km. So local QRM is possible. On Saturday the techs will install all new GPS antennas with integrated band-pass filters. Conf call on Saturday night at 6pm my time will produce more date. -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com Sent: Saturday, July 28, 2012 2:27 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Lightsquared questionfor SFO area This is one well documented example of an earlier unintentional jamming incident. _http://www.gpsworld.com/gnss-system/signal-processing/the-hunt-rfi-776_ (http://www.gpsworld.com/gnss-system/signal-processing/the-hunt-rfi-776) Regards Nigel GM8PZR In a message dated 28/07/2012 02:43:23 GMT Daylight Time, wa1...@att.net writes: Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. -Brian, WA1ZMS ___ 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] 5MHz ocxo- Opening Solder sealed cans
On 27/07/12 03:17, Tom Miller wrote: I agree with Ron. Clean the board up real good then do an inspection. Talking of which does anyone have any suggestions as to with what? I've tried IPA, ethanol, acetone and even some of the tiny amount of 1,1,1 trichloroethane I have left (yes, I know it's banned). Nothing so far has had much impact on the remains of the foam or the remains of the sticky tape (the yellow residue on some of the components in the photos). I'm running out of ideas as to what might clean it off without damaging the board. ___ 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] 5MHz ocxo- Opening Solder sealed cans
Paul Flinders wrote: On 27/07/12 03:17, Tom Miller wrote: I agree with Ron. Clean the board up real good then do an inspection. Talking of which does anyone have any suggestions as to with what? I've tried IPA, ethanol, acetone and even some of the tiny amount of 1,1,1 trichloroethane I have left (yes, I know it's banned). Nothing so far has had much impact on the remains of the foam or the remains of the sticky tape (the yellow residue on some of the components in the photos). I'm running out of ideas as to what might clean it off without damaging the board. I can't guarantee anything, but I'd be surprised if Fluxclene didn't do the trick: http://www.electrolube.com/docs/cleaningmain.asp?id=13 Mike ___ 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] 5MHz ocxo- Opening Solder sealed cans
On 28/07/12 21:13, Mike Millen wrote: Paul Flinders wrote: On 27/07/12 03:17, Tom Miller wrote: I agree with Ron. Clean the board up real good then do an inspection. Talking of which does anyone have any suggestions as to with what? I've tried IPA, ethanol, acetone and even some of the tiny amount of 1,1,1 trichloroethane I have left (yes, I know it's banned). Nothing so far has had much impact on the remains of the foam or the remains of the sticky tape (the yellow residue on some of the components in the photos). I'm running out of ideas as to what might clean it off without damaging the board. I can't guarantee anything, but I'd be surprised if Fluxclene didn't do the trick: http://www.electrolube.com/docs/cleaningmain.asp?id=13 Thanks I'll give it a try. ___ 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] 5MHz ocxo- Opening Solder sealed cans
I can't guarantee anything, but I'd be surprised if Fluxclene didn't do the trick: http://www.electrolube.com/docs/cleaningmain.asp?id=13 Thanks I'll give it a try. Also try some naptha (sold as lighter fluid, or as a product called Goof-Off.) -- john, KE5FX Miles Design LLC ___ 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] 5MHz ocxo- Opening Solder sealed cans
On 28/07/2012 22:38, John Miles wrote: I can't guarantee anything, but I'd be surprised if Fluxclene didn't do the trick: http://www.electrolube.com/docs/cleaningmain.asp?id=13 Thanks I'll give it a try. Also try some naptha (sold as lighter fluid, or as a product called Goof-Off.) goof-off doesn't seem to be available easily in the UK - naptha might be worth a go. That said I did try a label removal solvent which I've found useful on other general gunk (the pro-power one) and that didn't touch it. ___ 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] HP 3586B Selective Level Meter
Chuck, Got two of these guys, the B and the C. The C is the desirable one, 50ohms, but you will pay about three times the price. Use the adapter, it's $16 from the link below, it just isn't worth taking apart. Also, you will need a 50ohm BNC feed thru termination, then set the front panel to 10Kohm input. That will get you back to a 50 ohm input. Then you need to add approx 1.76dB to correct the display for the change from 75ohms to 50ohms. You can use the display offset function. Assuming this a fancy voltmeter, note that for 0dBm in a 75 ohm system you need 274mV at the terminals. 0dBm in a 50 ohm system can only provide 224mV, and thus will read -1.76dBm. Thus add 1.76dBm to correct the display. Impedance 50 75 75 Voltage 0.224 0.224 0.274 Watts 0.001 0.001 0.001 dBm 0.000 -1.761 0.000 Good luck Bob http://www.milestek.com/s-147-trompeter-connectors.aspx - Original Message - From: Chuck Forsberg WA7KGX N2469R c...@omen.com To: time-nuts time-nuts@febo.com Sent: Thursday, July 19, 2012 2:22 AM Subject: [time-nuts] HP 3586B Selective Level Meter Got one of these massive (by today's standards) beasts the other day. It has the option 003. Quite the light show when it powers up. I have its external reference daisy chained with a radio and two other instruments sucking 10 MHz from my Thunderbolt. I have not decided what to do with the ATT front panel input. Should I get a BNC adapter for it? Or replace it with a BNC connector? -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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] HP 3586B Selective Level Meter
It is absolutely trivial to put a BNC on the A and well worth it. HTTP://www.KO4BB.com/Test_Equipment/HP_3586_Modified.jpg One less connector interface to worry about, and less risk of getting the cable tangled up and breaking the adapter. And it looks good. The 3586 Option 003 has the same bandwidth selections as the C model. Without Option 003, the 3100Hz bw is replaced with 1740 Hz , not nearly as useful. Didier KO4BB Robert Benward rbenw...@verizon.net wrote: Chuck, Got two of these guys, the B and the C. The C is the desirable one, 50ohms, but you will pay about three times the price. Use the adapter, it's $16 from the link below, it just isn't worth taking apart. Also, you will need a 50ohm BNC feed thru termination, then set the front panel to 10Kohm input. That will get you back to a 50 ohm input. Then you need to add approx 1.76dB to correct the display for the change from 75ohms to 50ohms. You can use the display offset function. Assuming this a fancy voltmeter, note that for 0dBm in a 75 ohm system you need 274mV at the terminals. 0dBm in a 50 ohm system can only provide 224mV, and thus will read -1.76dBm. Thus add 1.76dBm to correct the display. Impedance 50 75 75 Voltage 0.224 0.224 0.274 Watts 0.001 0.001 0.001 dBm 0.000 -1.761 0.000 Good luck Bob http://www.milestek.com/s-147-trompeter-connectors.aspx - Original Message - From: Chuck Forsberg WA7KGX N2469R c...@omen.com To: time-nuts time-nuts@febo.com Sent: Thursday, July 19, 2012 2:22 AM Subject: [time-nuts] HP 3586B Selective Level Meter Got one of these massive (by today's standards) beasts the other day. It has the option 003. Quite the light show when it powers up. I have its external reference daisy chained with a radio and two other instruments sucking 10 MHz from my Thunderbolt. I have not decided what to do with the ATT front panel input. Should I get a BNC adapter for it? Or replace it with a BNC connector? -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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. -- Sent from my Motorola Droid Razr phone with K-9 Mail. Please excuse my brevity. ___ 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] HP 3586B Selective Level Meter
For what it's worth, I was at Fair Radio in Lima, OH on Thursday, and they had three of the 600 ohm 'B' models on the floor. Don't know the condition or the asking price, but if you are interested you should be able to get the contact info via Google. They have had these boxes for quite a while as they were there on my last visit about three years ago, so they might be interested in making them go away. Tom Holmes, N8ZM Tipp City, OH EM79 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Robert Benward Sent: Saturday, July 28, 2012 6:40 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 3586B Selective Level Meter Chuck, Got two of these guys, the B and the C. The C is the desirable one, 50ohms, but you will pay about three times the price. Use the adapter, it's $16 from the link below, it just isn't worth taking apart. Also, you will need a 50ohm BNC feed thru termination, then set the front panel to 10Kohm input. That will get you back to a 50 ohm input. Then you need to add approx 1.76dB to correct the display for the change from 75ohms to 50ohms. You can use the display offset function. Assuming this a fancy voltmeter, note that for 0dBm in a 75 ohm system you need 274mV at the terminals. 0dBm in a 50 ohm system can only provide 224mV, and thus will read -1.76dBm. Thus add 1.76dBm to correct the display. Impedance 50 75 75 Voltage 0.224 0.224 0.274 Watts 0.001 0.001 0.001 dBm 0.000 -1.761 0.000 Good luck Bob http://www.milestek.com/s-147-trompeter-connectors.aspx - Original Message - From: Chuck Forsberg WA7KGX N2469R c...@omen.com To: time-nuts time-nuts@febo.com Sent: Thursday, July 19, 2012 2:22 AM Subject: [time-nuts] HP 3586B Selective Level Meter Got one of these massive (by today's standards) beasts the other day. It has the option 003. Quite the light show when it powers up. I have its external reference daisy chained with a radio and two other instruments sucking 10 MHz from my Thunderbolt. I have not decided what to do with the ATT front panel input. Should I get a BNC adapter for it? Or replace it with a BNC connector? -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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] HP 3586B Selective Level Meter
Fair Radio is perfectly happy to have something sit there for decades figuring they'll get their price eventually. In this case they want $750 for them: https://www.fairradio.com/catalog.php?mode=viewitemitem=2746 I've been there a few times with a wad of cash and couldn't get them to move by anything significant so ended up leaving with more cash than gear. Probably for the best anyway. Peter On 7/28/2012 10:31 PM, Tom Holmes wrote: For what it's worth, I was at Fair Radio in Lima, OH on Thursday, and they had three of the 600 ohm 'B' models on the floor. Don't know the condition or the asking price, but if you are interested you should be able to get the contact info via Google. They have had these boxes for quite a while as they were there on my last visit about three years ago, so they might be interested in making them go away. Tom Holmes, N8ZM Tipp City, OH EM79 ___ 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] HP 3586B Selective Level Meter
Sorry for the triplicate message before, it looks like my new shiny phone is sending messages before I am finished... The 3586 is a very nice machine. Make sure you have Option 003 if you get an A or a B and you intend to use it for voice or digital data that requires 3kHz bandwidth. I paid $90 for mine a while back, and while it was broken, it was a relatively simple fix. I have little hope of such a good deal again. Didier KO4BB On , Tom Holmes thol...@woh.rr.com wrote: For what it's worth, I was at Fair Radio in Lima, OH on Thursday, and they had three of the 600 ohm 'B' models on the floor. Don't know the condition or the asking price, but if you are interested you should be able to get the contact info via Google. They have had these boxes for quite a while as they were there on my last visit about three years ago, so they might be interested in making them go away. Tom Holmes, N8ZM Tipp City, OH EM79 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Robert Benward Sent: Saturday, July 28, 2012 6:40 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 3586B Selective Level Meter Chuck, Got two of these guys, the B and the C. The C is the desirable one, 50ohms, but you will pay about three times the price. Use the adapter, it's $16 from the link below, it just isn't worth taking apart. Also, you will need a 50ohm BNC feed thru termination, then set the front panel to 10Kohm input. That will get you back to a 50 ohm input. Then you need to add approx 1.76dB to correct the display for the change from 75ohms to 50ohms. You can use the display offset function. Assuming this a fancy voltmeter, note that for 0dBm in a 75 ohm system you need 274mV at the terminals. 0dBm in a 50 ohm system can only provide 224mV, and thus will read -1.76dBm. Thus add 1.76dBm to correct the display. Impedance 50 75 75 Voltage 0.224 0.224 0.274 Watts 0.001 0.001 0.001 dBm 0.000 -1.761 0.000 Good luck Bob http://www.milestek.com/s-147-trompeter-connectors.aspx - Original Message - From: Chuck Forsberg WA7KGX N2469R c...@omen.com To: time-nuts time-nuts@febo.com Sent: Thursday, July 19, 2012 2:22 AM Subject: [time-nuts] HP 3586B Selective Level Meter Got one of these massive (by today's standards) beasts the other day. It has the option 003. Quite the light show when it powers up. I have its external reference daisy chained with a radio and two other instruments sucking 10 MHz from my Thunderbolt. I have not decided what to do with the ATT front panel input. Should I get a BNC adapter for it? Or replace it with a BNC connector? -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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.
