[time-nuts] LTE-Lite and - S14WI 1x4 GPS splitter
Gents I have a S14WI GPS antenna splitter w. Opt : Amplified + DC Bias Select + Ant Current monitor It's connected to a Maxrad 40dB ice cone timing antenna DS for the spliter here http://www.amtechs.co.jp/2_gps/pdf/S14WI_spec.pdf http://tinyurl.com/nfmpyqm Currently i have this connected : Port1 : Tbolt Port2 : Z3810A Port3 : Reserved KS Lucent (Waiting for TNC-BNC adapter) Port4 : Reserved for LTE-Lite (hope to connect today) Port3/4 have a 50ohm (BNC ethernet terminator) on right now As i read the DS , the splitter currently used the antenna power from Port1, to power the antenna, and Port2 is terminated w. 200ohm. I'm a bit unsure about the DS , but as i read it it will isolate Port4 from the antenna DC , as it draws power from Port1 (Tbolt) The LTE-Lite is 3v3 , and wouldn't like to get 5v on it's antenna. If anyone could have a quick glance , and verify my assumptions i'd be gratefull. TIA CFO -Denmark -- E-mail:xne...@luna.dyndns.dk ___ 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] Are there commercial clocks that decode the new WWVB PM signal available yet?
Last I heard, a chip (or chips) that decode the new PM signal added to the WWVB PWM signal 2 years ago was in development, but I'm not sure one has been released yet. If such a chip has been released, has it been incorporated into any consumer Atomic Clocks that are currently available? Thanks, 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] anyone tried the cheap Lea-6T modules seen on eBay?
Le 25 nov. 2014 à 19:29, Joseph Gray jg...@zianet.com a écrit : I bought one of those recently. I haven't done more than power it on to see if it works. I will probably look at it more over Thanksgiving. If you are thinking of replacing the patch antenna with a connector to external antenna as I did, be careful of mechanical bonding. For practical purposes I had place the 5 pin through hole SMA on the top of the module. This meant that I had to run a short connection up through the original patch antenna hole to connect to the board trace. Error. It worked fine, but while boxing for use as an NTP source I inadvertently put pressure on that wire and ripped off the board trace. So my NTP source has been relegated to parts. Maybe better to have the wire running on the top. Joe Gray W5JG On Nov 25, 2014 9:15 AM, Mike Cook michael.c...@sfr.fr wrote: You may have seen them as in http://www.ebay.fr/itm/Ublox-LEA-6T-GPS-Module-w-Compass-for-APM2-5-APM2-6-Flight-Controller-Multirotor-/271641375221?pt=UK_ToysGames_RadioControlled_JNhash=item3f3f1671f5 There are other sellers with the same. My idea was to see if one was suitable as a 1PPS locking source for my PRS10. The interest for me being that it powers directly from a USB connection and can be configured with the Ublox's u-center software, so implementation is a no brainer. All I needed to do was to replace the patch antenna with an SMA-F connector and add a wire for the 1PPS. Despite having less than ideal antenna position, once the survey was complete I was getting +/-20ns jitter on the 1PPS which is within spec and stable over the day. However I was most disappointed to see that the 1PPS output voltage is only 2.16 +/-0.4V. According to spec it should be Vcc+/-0.4V and I have Vcc measuring 3.3V. I can't see the board trace but the measured voltage is the same on the PPS pad next to the JST-SH connector and on the GPS modules pin 28 so it is not a board issue. Unfortunately this is too low to tickle the PRS10 1PPS input. I guess I could add a buffer or AND gate to fix it, but that sort of defeats the object and introduces extra jitter and offset. It is however enough for a Raspberry-Pi GPIO input, so I have relegated it to NTP PPS. Has anyone out there got one of these and seen the same symptoms? Or maybe you have one and it is OK? I'd like to know. You will be able to see from the eBay photos that this a 6T-0-000 version which is an early version and it could be that they are cheap as some/all have this defect. So beware. ___ 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] LTE-Lite and - S14WI 1x4 GPS splitter
xne...@luna.dyndns.dk said: The LTE-Lite is 3v3 , and wouldn't like to get 5v on it's antenna. I'd put a voltmeter on that connector and see if the splitter is sending anything out. My scan of the data sheet looks like it will do the right thing. -- These are my opinions. I hate spam. ___ 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] LTE-Lite and - S14WI 1x4 GPS splitter
Hi! The splitter will not route 5V back out to another splitter port. Your gpsd(tcx)o antenna port is safe. -- Björn div Originalmeddelande /divdivFrån: cfo xne...@luna.dyndns.dk /divdivDatum:2014-11-29 08:53 (GMT+01:00) /divdivTill: time-nuts@febo.com /divdivRubrik: [time-nuts] LTE-Lite and - S14WI 1x4 GPS splitter /divdiv /divGents I have a S14WI GPS antenna splitter w. Opt : Amplified + DC Bias Select + Ant Current monitor It's connected to a Maxrad 40dB ice cone timing antenna DS for the spliter here http://www.amtechs.co.jp/2_gps/pdf/S14WI_spec.pdf http://tinyurl.com/nfmpyqm Currently i have this connected : Port1 : Tbolt Port2 : Z3810A Port3 : Reserved KS Lucent (Waiting for TNC-BNC adapter) Port4 : Reserved for LTE-Lite (hope to connect today) Port3/4 have a 50ohm (BNC ethernet terminator) on right now As i read the DS , the splitter currently used the antenna power from Port1, to power the antenna, and Port2 is terminated w. 200ohm. I'm a bit unsure about the DS , but as i read it it will isolate Port4 from the antenna DC , as it draws power from Port1 (Tbolt) The LTE-Lite is 3v3 , and wouldn't like to get 5v on it's antenna. If anyone could have a quick glance , and verify my assumptions i'd be gratefull. TIA CFO -Denmark -- E-mail:xne...@luna.dyndns.dk ___ 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] Minicircuits 10% discount in December
Bob Camp wrote: Hi On Nov 28, 2014, at 8:48 PM, Dave M dgmin...@mediacombb.net wrote: Gerhard Hoffmann wrote: Am 28.11.2014 um 23:42 schrieb Dave M: A couple weeks ago, I sent an email to the Minicircuits technical support folks in hopes of getting this, or similar, info about a couple of their transformer models (specifically, T1-1 and T4-1-KK81), but so far, I'm still waiting. Guess I should give them a call.. got great technical advice from them when I called for help some time ago. Try that: http://lmgtfy.com/?q=T1-1-KK81.pdf The first anwer looks like a hit. regards, Gerhard Thanks Gerhard, but I can't get that link to work. It sends me to Google, which tells me that I need to enable Javascript. Javascript has been turned on and running on my system for years, but apparently, that link doesn't see it. The link animates a Google search for the part number. The first thing that comes up here is the standard Mini-Circuits spec sheet for the part. It’s got the usual S parameter data, but nothing on DC current. Bob Thanks for clearing that up, Bob. I have had the spec sheet for quite a while, but its only mention of DC current is the Max DC spec of 30ma, but no data describing the effects of it on the device's performance. Dave M ___ 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] LTE-Lite and - S14WI 1x4 GPS splitter
On Sat, 29 Nov 2014 10:54:17 +0100, Björn wrote: Hi! The splitter will not route 5V back out to another splitter port. Your gpsd(tcx)o antenna port is safe. Thanx Hal Björn I have connected it , and it seems to be running fine It has been on for about 1 hr now. $PJLTS,-4.14,-9.10,3870,6,1.7941415,59.8047,9.4E-10,0,8,0x0*55 $PJLTS,-4.30,-9.10,3871,6,1.7941431,59.8047,9.3E-10,0,7,0x0*5C $PJLTS,-4.46,-9.10,3872,6,1.7941451,59.8048,9.3E-10,0,9,0x0*59 Björn do you have the same splitter , i know Magnus does /CFO ___ 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] Homebrew frequency counter, need help
Hi Thanks for the great article. I did a little test just now. To measure the refclk of itself. And this is the result(I kept 10 digits of the fraction part): ### Frequency Counter startup ### gate=1s #=8985 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9039 freq=10.02 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.02 gate=1s #=9037 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9037 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9039 freq=10.00 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.00 gate=1s #=9029 freq=10.00 gate=1s #=9034 freq= 9.99 gate=1s #=9034 freq=10.01 gate=1s #=9030 freq=10.02 gate=1s #=9037 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.03 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.03 gate=1s #=9037 freq=10.01 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.00 gate=1s #=9030 freq=10.03 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9039 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9037 freq=10.00 gate=1s #=9030 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9037 freq= 9.99 gate=1s #=9035 freq=10.00 gate=1s #=9039 freq=10.02 gate=1s #=9037 freq= 9.99 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.00 gate=1s #=9030 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9030 freq=10.01 gate=1s #=9030 freq=10.00 gate=1s #=9034 freq=10.01 gate=1s #=9038 freq= 9.99 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9030 freq= 9.99 gate=1s #=9034 freq=10.00 gate=1s #=9030 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9031 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9039 freq=10.00 gate=1s #=9034 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9039 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.00 gate=1s #=9039 freq=10.01 gate=1s #=9037 freq=10.01 gate=1s #=9038 freq=10.03 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9030 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9037 freq=10.01 gate=1s #=9030 freq=10.01 gate=1s #=9037 freq= 9.99 gate=1s #=9034 freq=10.00 gate=1s #=9030 freq=10.00 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9030 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq= 9.99 gate=1s #=9034 freq=10.01 gate=1s #=9038 freq=10.02 gate=1s #=9037 freq= 9.99 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq= 9.99 gate=1s #=9034 freq=10.00 gate=1s #=9030 freq=10.01 2014-11-29 5:57 GMT+08:00 Kasper Pedersen time-n...@kasperkp.dk: On 11/27/2014 03:08 PM, lllaaa wrote: Hi guys, I've just get my homebrew counter working. And the resolution seems 10x better than my RACAL DANA 1992. This counter is heavily inspired by the idea from Kasper Pedersen. http://n1.taur.dk/permanent/frequencymeasurement.pdf STM32F051RB EMP240T100C5 do the control and counting job. TDC-GP22 as the interpolator. Linear regression is done by CPU. There are no fancy analog front for both signal path and refclk path. I'm using two SN75ALS176 and the schmitt input of CPLD to do the job. I've noticed that the 10s gate does not get more meaningful digits(looks worse than 1s gate). So here are the questions: 1) I'm wondering if I could say this is an 11 digits/s counter? 2) How can I improve that? Is it limited by the 485 transceiver? I can switch to a faster MCU, that gets more measures per second, but I
Re: [time-nuts] Are there commercial clocks that decode the new WWVB PM signal available yet?
Hi As far as anybody knows, the chips have yet to go into any “real” products. My theory is that a fairly large order (say 10K a week) is what they are looking for to get going on this. They may have to wait a while for that sort of thing to come along. They will still be well inside patient protection a decade from now. They can wait. Bob On Nov 29, 2014, at 2:36 AM, John Marvin jm-t...@themarvins.org wrote: Last I heard, a chip (or chips) that decode the new PM signal added to the WWVB PWM signal 2 years ago was in development, but I'm not sure one has been released yet. If such a chip has been released, has it been incorporated into any consumer Atomic Clocks that are currently available? Thanks, 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. ___ 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] Minicircuits 10% discount in December
Hi On Nov 29, 2014, at 5:26 AM, Dave M dgmin...@mediacombb.net wrote: Bob Camp wrote: Hi On Nov 28, 2014, at 8:48 PM, Dave M dgmin...@mediacombb.net wrote: Gerhard Hoffmann wrote: Am 28.11.2014 um 23:42 schrieb Dave M: A couple weeks ago, I sent an email to the Minicircuits technical support folks in hopes of getting this, or similar, info about a couple of their transformer models (specifically, T1-1 and T4-1-KK81), but so far, I'm still waiting. Guess I should give them a call.. got great technical advice from them when I called for help some time ago. Try that: http://lmgtfy.com/?q=T1-1-KK81.pdf The first anwer looks like a hit. regards, Gerhard Thanks Gerhard, but I can't get that link to work. It sends me to Google, which tells me that I need to enable Javascript. Javascript has been turned on and running on my system for years, but apparently, that link doesn't see it. The link animates a Google search for the part number. The first thing that comes up here is the standard Mini-Circuits spec sheet for the part. It’s got the usual S parameter data, but nothing on DC current. Bob Thanks for clearing that up, Bob. I have had the spec sheet for quite a while, but its only mention of DC current is the Max DC spec of 30ma, but no data describing the effects of it on the device's performance. My past experience with Minicircuits is that they will not give you any data the “extends” the spec on a part. Simply put - if you are after 1 MHz data on a part that stops at 10, they are not likely to supply it. I guess the policy is in place so they don’t wind up with parts spec’d outside their normal range. I’d still give them a call, the policy may have changed, or it may not apply to current … Bob Dave M ___ 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] Homebrew frequency counter, need help
Hi Your data would be called “10 digits +/- 1.5 least significant digits”. Shave a the spread down to 2 instead of 3 and you are at a very tight 10 digit spec. Based on your equipment inventory, you have seen 10 digit +/- 2 counters. You have them beat. The same is true of 9 digit +/- any counters. It looks like there is a slight bias in the data. If the bias is stable, you can take it out in software. If it drifts, taking it out may be a bit more complex. Bob On Nov 29, 2014, at 7:49 AM, Li Ang lll...@gmail.com wrote: Hi Thanks for the great article. I did a little test just now. To measure the refclk of itself. And this is the result(I kept 10 digits of the fraction part): ### Frequency Counter startup ### gate=1s #=8985 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9039 freq=10.02 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.02 gate=1s #=9037 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9037 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9039 freq=10.00 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.00 gate=1s #=9029 freq=10.00 gate=1s #=9034 freq= 9.99 gate=1s #=9034 freq=10.01 gate=1s #=9030 freq=10.02 gate=1s #=9037 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.03 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.03 gate=1s #=9037 freq=10.01 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.00 gate=1s #=9030 freq=10.03 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9039 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9037 freq=10.00 gate=1s #=9030 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9037 freq= 9.99 gate=1s #=9035 freq=10.00 gate=1s #=9039 freq=10.02 gate=1s #=9037 freq= 9.99 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.02 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.00 gate=1s #=9030 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9030 freq=10.01 gate=1s #=9030 freq=10.00 gate=1s #=9034 freq=10.01 gate=1s #=9038 freq= 9.99 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9030 freq= 9.99 gate=1s #=9034 freq=10.00 gate=1s #=9030 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9031 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9039 freq=10.00 gate=1s #=9034 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9039 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9034 freq=10.00 gate=1s #=9039 freq=10.01 gate=1s #=9037 freq=10.01 gate=1s #=9038 freq=10.03 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.01 gate=1s #=9030 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9037 freq=10.01 gate=1s #=9030 freq=10.01 gate=1s #=9037 freq= 9.99 gate=1s #=9034 freq=10.00 gate=1s #=9030 freq=10.00 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq=10.00 gate=1s #=9030 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq= 9.99 gate=1s #=9034 freq=10.01 gate=1s #=9038 freq=10.02 gate=1s #=9037 freq= 9.99 gate=1s #=9034 freq=10.02 gate=1s #=9038 freq=10.01 gate=1s #=9038 freq= 9.99 gate=1s #=9034 freq=10.00 gate=1s #=9030 freq=10.01 2014-11-29 5:57 GMT+08:00 Kasper Pedersen time-n...@kasperkp.dk: On 11/27/2014 03:08 PM, lllaaa wrote: Hi guys, I've just get my homebrew counter working. And the resolution seems 10x better than my RACAL DANA 1992. This counter is heavily inspired by the idea from Kasper Pedersen.
Re: [time-nuts] Minicircuits specs
Charles Steinmetz wrote: Bob wrote: My past experience with Minicircuits is that they will not give you any data the extends the spec on a part. Simply put - if you are after 1 MHz data on a part that stops at 10, they are not likely to supply it. I've had better luck getting data from them that is just not stated (as opposed to being outside a stated spec) -- for example, the nominal inductance of windings. I suspect the same might be true if someone asked, What exactly do you mean by 'DC: 30mA?' You probably wouldn't get hard data or graphs, but they might give you an idea of how they arrived at that spec. In the end, though, the only way to be sure a certain part will work in any particular circuit is to build and test it. Don't forget, you can generally keep DC out of transformer windings with shunt coupling (use an RF choke for the DC path, and capacitor couple into the transformer winding). It's an unwanted complexity, but some builders may prefer it to winding their own transformers. Best regards, Charles Yeah, that's a good way to completely avoid the issue. Since I'm the only target audience for my efforts, then I don't mind the extra components. I'm beginning to realize, as I get deeper into building my own stuff, that a VNA is quite a desireable piece of equipment. Unfortunately, I'll have to make use of my spectrum analyzer and RLC meters instead. Thanks for the responses. Dave M ___ 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] Minicircuits specs
Here is a link to a pretty exhaustive list of MCL models that would be handy if you only need published specs. -Arthur http://www.minicircuits.com/MCLStore/ModelSearch?model= ___ 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] Truetime GPS-DC-416 specs ?
Tim I am sure its a fantastic ebay deal. NOT. Lots O money for silly realities. Like junk. That said I have recovered some of the older GPS things like Odetics and Austrons including home brewing missing down converters. The Austrons one heck of a box actually. But all of the things I have picked up are sub $20 from flea markets. The Austron as an example was actually for the case. Ops that sort of never happened. Its a totally different story when someone wants $600. Thats serious cash for a bag of questions. If you need a real source you can not beat the Lucent KS-24361 talked about here. At $ 200 with shipping its a heck of a more modern unit and it just works. I loved the $75 and was in the process of ordering a second when I realized they went to $150. Darn to slow. Not as much fun as tinkering, but not at $600. Best regards Paul WB8TSL On Fri, Nov 28, 2014 at 11:28 PM, Tim t...@skybase.net wrote: Thanks guys, It was just a matter of curiosity, there's one locally for sale on ebay and I hadn't seen one before :) cheers Tim -- VK2XAX :: QF56if23 :: BMARC :: WIA :: AMSATVK ___ 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] Minicircuits specs
Bob wrote: My past experience with Minicircuits is that they will not give you any data the extends the spec on a part. Simply put - if you are after 1 MHz data on a part that stops at 10, they are not likely to supply it. I've had better luck getting data from them that is just not stated (as opposed to being outside a stated spec) -- for example, the nominal inductance of windings. I suspect the same might be true if someone asked, What exactly do you mean by 'DC: 30mA?' You probably wouldn't get hard data or graphs, but they might give you an idea of how they arrived at that spec. In the end, though, the only way to be sure a certain part will work in any particular circuit is to build and test it. Don't forget, you can generally keep DC out of transformer windings with shunt coupling (use an RF choke for the DC path, and capacitor couple into the transformer winding). It's an unwanted complexity, but some builders may prefer it to winding their own transformers. 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.
[time-nuts] LTE Lite installation comments
Want to thank everyone for the various comments and insights of the LTE, filters, buffers etc. My unit is built up including dividers and distribution amps and simply need to drill a few holes in the front panel for on/off switch and a few status lamps some 16 BNC's. I want to thank both Bob and Charles for the comments on using 74HC or AS as line drivers with LPF filters. A pair of inverters per coax or 3 lines per 74HC14. Simple and effective for the 10' of coax on the bench distribution. I calculated Low Pass Filters for 10, 5, 1, and .1 Mhz. The older VLF radios use .1 Mhz as a reference. Certainly I can not speak to some of the detailed comments mentioned on Time-Nuts as to jitter etc. But I can say on a spectrum analyzer the outputs look very good. I used Saids inverters for the 1 PPS. I was considering RS 232 and RS 422 and may add those but less of a priority. It seems I always have coax around so this is a pretty nice way to get PPS to a project. So from discussions to real in a few days. Damn technology. I was beginning to believe the old basement Telco RB that drives my stuff was starting to fail. Darned if this project didn't prove it. I could see the RB jitter and occasionally loose lock. OK another project on the list. 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] Upgrade an HP 5342A microwave frequency counter to have an oven oscillator.
On 27 November 2014 at 22:38, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: The HP 5342A has an optional oven oscillator. I just bought one of those counters, but mine has a TCXO and is about 50 kHz off at 10 GHz. I'm sure I can trim it closer than that, but if possible I'd like to stick an oven oscillator in it. Does anyone know what is involved? I have at least one 10811A oscillator here that I could stick inside, but does it need any more, or just the oscillator? Someone said the oscillator should be an 10544-60011, but a 10811A is backwards compatible. Dave It was very easy to fit the 10811A oven (HP 10811-60111) and get the oven working, although the oven is not powered when the counter is not switched on, even if there is power at the AC mains input. I can live with that. In fact, I prefer it to be honest. The procedure was 1) Remove top and bottom covers, which means the two front feet, plus 4 rear feet/protectors need to be removed. 2) Undo one screw at the top that held a board with a TCXO on it. The board plugs into a 15-pin edge connector. 3) Pull out the board (HP P/N 05341-60047) with the TCXO. The TCXO on the board is a marked DALE, TCXO-22-1, 0960-0394, 10.0MHz, SET 1.0Hz. (normally I would put a space between a number and the units, but I've written what is actually on the TCXO). 4) Attempt to insert the 10811A oscillator. This failed, as there were some wires around the optional board for GPIB which were restricting the space too much. So I had to cut a wire tie, and move the wires out the way. 5) Fitted 10811A at the top. 6) Invert the counter, and screw in the two screws which secure the 10811A to the chassis. For this I needed to temporarily move a ribbon cable, as the screw was below it. 7) Powered it up, and it worked. It shows OVN in the right of the LED display. Once that went out, it still took a minute or two for the readings to become pretty stable, although no doubt it will take months to become as good as it will get. I've not adjusted it yet, as I don't have any accurate frequency reference. But whilst the actual frequency indicated on the counter is different from what my signal generators are supposed to be producing, the last few digits (100, 10 and 1 Hz), are not all jumping around when seeing 10 GHz. The frequency indicated on the counter when connected to two different signal generators, which both have ovens of unknown type, are: 1) HP 83623A 20 GHz sweeper set to 10.0 GHz, fed into high frequency input of the frequency counter. HP 5342A counter indicates 10,000,000,690 Hz (relative difference = +6.9 10^-8) 2) HP 8656A set to 100 MHz, HP 5342A counter indicates 99,999,987 Hz (relative difference = -1.3 x 10^-7) With the old TCXO in the frequency counter, the indicated frequency of the 10 GHz signal was about 48 kHz off, but it moved around a KHz or so. In contrast, now the oven is installed, the reading is a *lot* more stable, with it shifted about 15 Hz. I don't currently know the absolute accurate any of the references in the test equipment are, but certainly the readings are a lot more stable after fitting the oven. I will need to get a GPSDO before adjusting any, but if nothing else, the short term stability of the oven is clearly superior to the TCXO. Long term should be too, but I can't determine that from what I have. 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.
Re: [time-nuts] Minicircuits specs
2014-11-29 16:24 GMT+01:00 Dave M dgmin...@mediacombb.net: Yeah, that's a good way to completely avoid the issue. Since I'm the only target audience for my efforts, then I don't mind the extra components. I'm beginning to realize, as I get deeper into building my own stuff, that a VNA is quite a desireable piece of equipment. Unfortunately, I'll have to make use of my spectrum analyzer and RLC meters instead. Going a bit off topic, but there are decent VNA's avaible for an fair price. There is the N2PK VNA thats avaible as an board + digikey partlist and gives a 120dB dynamic range VNA from 10KHz to 50MHz, or there are the VNWA avaible ready buildt from the UK with 70-80dB dynamic range to 1.3GHz. Those are the ones I know that have true phase reading and can solve for the sign of the phase. Of course there are older HP or RS boxes, and probably others as well, and by shopping around one can get decent gear at a fair price, but with some added complexity of doing the measurments. Having an VNA helps doing measurments, but a lot of cool things can be done with a spectrum analyzer, adding a simple return loss bridge makes that into an quite decent scalar VNA. Brr. (its probably cold up here in the north :) Thomas LA3PNA. -- Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html PDF is an better alternative and there are always LaTeX! ___ 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] LTE-Lite and - S14WI 1x4 GPS splitter
Hi, I suggest that you use a DVM to see which ports are getting power. Better yet would be to disconnect everything and use an ohm-meter to see which ports are electrically connected. If you can't satisfy yourself that you know what's what, then contact GPS Source. They are very good people to deal with. I've got an MS-14 that had two powered ports plus the powered antenna port, plus it can be internally powered. I asked them about it, and they gave me instructions on how to de-power one of the ports. It was just a matter of removing a 000 shunt resistor and adding a 200 ohm load resistor. The way I read the product description is that the pick and choose likely means it has the same type of construction that mine does. A 000 resistor bypasses a blocking cap for power transfer ports, and you have to add a 200 ohm 1W (ex: CRCW2512200RJNEG) if you depower a port. But, contact them. They'll fix you right up. By the way, if your ports are labeled, PDC = powered DC and BDC = blocked DC. Bob - AE6RV From: cfo xne...@luna.dyndns.dk To: time-nuts@febo.com Sent: Saturday, November 29, 2014 1:53 AM Subject: [time-nuts] LTE-Lite and - S14WI 1x4 GPS splitter Gents I have a S14WI GPS antenna splitter w. Opt : Amplified + DC Bias Select + Ant Current monitor It's connected to a Maxrad 40dB ice cone timing antenna DS for the spliter here http://www.amtechs.co.jp/2_gps/pdf/S14WI_spec.pdf http://tinyurl.com/nfmpyqm Currently i have this connected : Port1 : Tbolt Port2 : Z3810A Port3 : Reserved KS Lucent (Waiting for TNC-BNC adapter) Port4 : Reserved for LTE-Lite (hope to connect today) Port3/4 have a 50ohm (BNC ethernet terminator) on right now As i read the DS , the splitter currently used the antenna power from Port1, to power the antenna, and Port2 is terminated w. 200ohm. I'm a bit unsure about the DS , but as i read it it will isolate Port4 from the antenna DC , as it draws power from Port1 (Tbolt) The LTE-Lite is 3v3 , and wouldn't like to get 5v on it's antenna. If anyone could have a quick glance , and verify my assumptions i'd be gratefull. TIA CFO -Denmark -- E-mail:xne...@luna.dyndns.dk ___ 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] Minicircuits specs
On 11/29/2014 12:08 PM, Thomas S. Knutsen wrote: 2014-11-29 16:24 GMT+01:00 Dave M dgmin...@mediacombb.net: Yeah, that's a good way to completely avoid the issue. Since I'm the only target audience for my efforts, then I don't mind the extra components. I'm beginning to realize, as I get deeper into building my own stuff, that a VNA is quite a desireable piece of equipment. Unfortunately, I'll have to make use of my spectrum analyzer and RLC meters instead. Going a bit off topic, but there are decent VNA's avaible for an fair price. There is the N2PK VNA thats avaible as an board + digikey partlist and gives a 120dB dynamic range VNA from 10KHz to 50MHz, or there are the VNWA avaible ready buildt from the UK with 70-80dB dynamic range to 1.3GHz. Those are the ones I know that have true phase reading and can solve for the sign of the phase. Of course there are older HP or RS boxes, and probably others as well, and by shopping around one can get decent gear at a fair price, but with some added complexity of doing the measurments. Having an VNA helps doing measurments, but a lot of cool things can be done with a spectrum analyzer, adding a simple return loss bridge makes that into an quite decent scalar VNA. Brr. (its probably cold up here in the north :) Thomas LA3PNA. Or the DG8SAQ 1.3 GHz VNA for about £350 GBP or ~$550 I suspect this is what you are calling the VNWA available ready built from the UK with 70-80dB dynamic range to 1.3GHz. http://sdr-kits.net/VNWA3_Description.html -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport) ___ 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] Minicircuits specs
Am 29.11.2014 um 19:08 schrieb Thomas S. Knutsen: 2014-11-29 16:24 GMT+01:00 Dave M dgmin...@mediacombb.net: Yeah, that's a good way to completely avoid the issue. Since I'm the only target audience for my efforts, then I don't mind the extra components. I'm beginning to realize, as I get deeper into building my own stuff, that a VNA is quite a desireable piece of equipment. Unfortunately, I'll have to make use of my spectrum analyzer and RLC meters instead. Ok, I volunteer to measure the S21 of a dc-force-fed T1-1 or T4-1 next weekend, when I'm back home. (DG8SAQ VNWA and / or WG TSA-2) Really, on osc, a voltmeter and a DC source are enough. Brr. (its probably cold up here in the north :) Thomas LA3PNA. Not only there. I was this afternoon for 3 hours with a motor bike on the Suebian Alp in southern Germany, just 3°C above the freezing point. The last half hour was not so pleasant. regards, Gerhard, dk4xp ___ 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] LTE-Lite and - S14WI 1x4 GPS splitter
Checking on this and anything you get is a very good idea. - Someone could have opened it up and added/deleted parts, in this case +5V on one of the ports that is suppose to be just a 200 ohm load. - Could have been a factory special with knows what configuration. - and so on On Sat, Nov 29, 2014 at 10:13 AM, Bob Stewart b...@evoria.net wrote: Hi, I suggest that you use a DVM to see which ports are getting power. Better yet would be to disconnect everything and use an ohm-meter to see which ports are electrically connected. If you can't satisfy yourself that you know what's what, then contact GPS Source. They are very good people to deal with. I've got an MS-14 that had two powered ports plus the powered antenna port, plus it can be internally powered. I asked them about it, and they gave me instructions on how to de-power one of the ports. It was just a matter of removing a 000 shunt resistor and adding a 200 ohm load resistor. The way I read the product description is that the pick and choose likely means it has the same type of construction that mine does. A 000 resistor bypasses a blocking cap for power transfer ports, and you have to add a 200 ohm 1W (ex: CRCW2512200RJNEG) if you depower a port. But, contact them. They'll fix you right up. By the way, if your ports are labeled, PDC = powered DC and BDC = blocked DC. Bob - AE6RV From: cfo xne...@luna.dyndns.dk To: time-nuts@febo.com Sent: Saturday, November 29, 2014 1:53 AM Subject: [time-nuts] LTE-Lite and - S14WI 1x4 GPS splitter Gents I have a S14WI GPS antenna splitter w. Opt : Amplified + DC Bias Select + Ant Current monitor It's connected to a Maxrad 40dB ice cone timing antenna DS for the spliter here http://www.amtechs.co.jp/2_gps/pdf/S14WI_spec.pdf http://tinyurl.com/nfmpyqm Currently i have this connected : Port1 : Tbolt Port2 : Z3810A Port3 : Reserved KS Lucent (Waiting for TNC-BNC adapter) Port4 : Reserved for LTE-Lite (hope to connect today) Port3/4 have a 50ohm (BNC ethernet terminator) on right now As i read the DS , the splitter currently used the antenna power from Port1, to power the antenna, and Port2 is terminated w. 200ohm. I'm a bit unsure about the DS , but as i read it it will isolate Port4 from the antenna DC , as it draws power from Port1 (Tbolt) The LTE-Lite is 3v3 , and wouldn't like to get 5v on it's antenna. If anyone could have a quick glance , and verify my assumptions i'd be gratefull. TIA CFO -Denmark -- E-mail:xne...@luna.dyndns.dk ___ 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] LTE Lite installation comments
Hi You can check part of the performance of the buffers with your ‘scope. Trigger on the input and look at the output. Depending on what sort of scope you have, you might get sub ns. Of course you also could simply trust that logic gates have pretty stable delay specs. Bob On Nov 29, 2014, at 11:12 AM, paul swed paulsw...@gmail.com wrote: Want to thank everyone for the various comments and insights of the LTE, filters, buffers etc. My unit is built up including dividers and distribution amps and simply need to drill a few holes in the front panel for on/off switch and a few status lamps some 16 BNC's. I want to thank both Bob and Charles for the comments on using 74HC or AS as line drivers with LPF filters. A pair of inverters per coax or 3 lines per 74HC14. Simple and effective for the 10' of coax on the bench distribution. I calculated Low Pass Filters for 10, 5, 1, and .1 Mhz. The older VLF radios use .1 Mhz as a reference. Certainly I can not speak to some of the detailed comments mentioned on Time-Nuts as to jitter etc. But I can say on a spectrum analyzer the outputs look very good. I used Saids inverters for the 1 PPS. I was considering RS 232 and RS 422 and may add those but less of a priority. It seems I always have coax around so this is a pretty nice way to get PPS to a project. So from discussions to real in a few days. Damn technology. I was beginning to believe the old basement Telco RB that drives my stuff was starting to fail. Darned if this project didn't prove it. I could see the RB jitter and occasionally loose lock. OK another project on the list. 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. ___ 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] LTE Lite installation comments
Hi If you are looking at the 10 MHz outputs and want to see what they are doing - feed a pair of outputs into a double balanced mixer. You will get an IF output that tracks the phase between the two outputs. Best to do it with 90 degrees of coax shifting things so you get a zero output. Track the voltage (maybe after a preamp) and you are measuring phase. Calibrate the mixer by changing the coax and you have pretty accurate information. Bob On Nov 29, 2014, at 11:12 AM, paul swed paulsw...@gmail.com wrote: Want to thank everyone for the various comments and insights of the LTE, filters, buffers etc. My unit is built up including dividers and distribution amps and simply need to drill a few holes in the front panel for on/off switch and a few status lamps some 16 BNC's. I want to thank both Bob and Charles for the comments on using 74HC or AS as line drivers with LPF filters. A pair of inverters per coax or 3 lines per 74HC14. Simple and effective for the 10' of coax on the bench distribution. I calculated Low Pass Filters for 10, 5, 1, and .1 Mhz. The older VLF radios use .1 Mhz as a reference. Certainly I can not speak to some of the detailed comments mentioned on Time-Nuts as to jitter etc. But I can say on a spectrum analyzer the outputs look very good. I used Saids inverters for the 1 PPS. I was considering RS 232 and RS 422 and may add those but less of a priority. It seems I always have coax around so this is a pretty nice way to get PPS to a project. So from discussions to real in a few days. Damn technology. I was beginning to believe the old basement Telco RB that drives my stuff was starting to fail. Darned if this project didn't prove it. I could see the RB jitter and occasionally loose lock. OK another project on the list. 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. ___ 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] Truetime GPS-DC-416 specs ?
Hi Paul, Wasn't thinking of getting it - just curious about is all. I have multiple Thunderbolts and rubidium's here, so not short of a standard or two :) The KS-24361 is tempting though, just not sure I can justify it - way to many other projects to complete! cheers Tim -- VK2XAX :: QF56if23 :: BMARC :: WIA :: AMSATVK ___ 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] Upgrade an HP 5342A microwave frequency counter to have an oven oscillator.
Is the upgrade similarly easy on a 53131A ? I realise that it needs to have an additional controller pcb but I have one of these counters fitted with option 001. The pcb holding the oscillator has an edge connector that looks suitable for a 10811A, and I have one to hand as well as a couple of compatible oscillators. I think I would need to remove the existing TCXO module - I haven't investigated too carefully yet but I think it's soldered in, and obstructs the mounting of the 10811A. On Sat, Nov 29, 2014 at 5:20 PM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: On 27 November 2014 at 22:38, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: The HP 5342A has an optional oven oscillator. I just bought one of those counters, but mine has a TCXO and is about 50 kHz off at 10 GHz. I'm sure I can trim it closer than that, but if possible I'd like to stick an oven oscillator in it. Does anyone know what is involved? I have at least one 10811A oscillator here that I could stick inside, but does it need any more, or just the oscillator? Someone said the oscillator should be an 10544-60011, but a 10811A is backwards compatible. Dave It was very easy to fit the 10811A oven (HP 10811-60111) and get the oven working, although the oven is not powered when the counter is not switched on, even if there is power at the AC mains input. I can live with that. In fact, I prefer it to be honest. The procedure was 1) Remove top and bottom covers, which means the two front feet, plus 4 rear feet/protectors need to be removed. 2) Undo one screw at the top that held a board with a TCXO on it. The board plugs into a 15-pin edge connector. 3) Pull out the board (HP P/N 05341-60047) with the TCXO. The TCXO on the board is a marked DALE, TCXO-22-1, 0960-0394, 10.0MHz, SET 1.0Hz. (normally I would put a space between a number and the units, but I've written what is actually on the TCXO). 4) Attempt to insert the 10811A oscillator. This failed, as there were some wires around the optional board for GPIB which were restricting the space too much. So I had to cut a wire tie, and move the wires out the way. 5) Fitted 10811A at the top. 6) Invert the counter, and screw in the two screws which secure the 10811A to the chassis. For this I needed to temporarily move a ribbon cable, as the screw was below it. 7) Powered it up, and it worked. It shows OVN in the right of the LED display. Once that went out, it still took a minute or two for the readings to become pretty stable, although no doubt it will take months to become as good as it will get. I've not adjusted it yet, as I don't have any accurate frequency reference. But whilst the actual frequency indicated on the counter is different from what my signal generators are supposed to be producing, the last few digits (100, 10 and 1 Hz), are not all jumping around when seeing 10 GHz. The frequency indicated on the counter when connected to two different signal generators, which both have ovens of unknown type, are: 1) HP 83623A 20 GHz sweeper set to 10.0 GHz, fed into high frequency input of the frequency counter. HP 5342A counter indicates 10,000,000,690 Hz (relative difference = +6.9 10^-8) 2) HP 8656A set to 100 MHz, HP 5342A counter indicates 99,999,987 Hz (relative difference = -1.3 x 10^-7) With the old TCXO in the frequency counter, the indicated frequency of the 10 GHz signal was about 48 kHz off, but it moved around a KHz or so. In contrast, now the oven is installed, the reading is a *lot* more stable, with it shifted about 15 Hz. I don't currently know the absolute accurate any of the references in the test equipment are, but certainly the readings are a lot more stable after fitting the oven. I will need to get a GPSDO before adjusting any, but if nothing else, the short term stability of the oven is clearly superior to the TCXO. Long term should be too, but I can't determine that from what I have. 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.
[time-nuts] WTT New Lucent GPSDO set
List, My two new OEM Lucent sets arrived today. As I suspected from reading the previous posts, they are a total kettle of fish different from the older *yellow finned* series. Because I already have five of the *yellow finned* units I want to keep all my Lucent units the same style. I'm willing to trade on an even basis for the *yellow finned* style. If possible. I'd rather have more of the GPS boxes than the crystal XO boxes, but XO boxes aren't a deal breaker. I do however, want working *yellow finned* GPS boxes for my new style GPS boxes. I'll split the sets if necessary but I'd rather do a pair bases as the new sets can be enabled to *talk* together. My units came in OEM packed factory sealed boxes that Symetricon had made in Korea. If interested, please contact me off line at sandeenpaXatXyahoodotcom Regards, Perrier ___ 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.
