Re: [time-nuts] Spectracom 8140T Line Tap Schematic

2018-06-14 Thread gandalfg8--- via time-nuts
Hi Julien, Earlier replies that discussed removing the DC supply from the 8140 outputs gave me the impression your requirement was to connect directly the outputs of the 8140 without line tap modules, which is what I was addressing with my recent suggestion of a series capacitor, but can

[time-nuts] Spectracom 8140T Line Tap Schematic

2018-06-12 Thread gandalfg8--- via time-nuts
This is probably now well past its sell by date but over the years there have been a number of requests here for schematics of the Spectracom 8140T Line Taps as used with the 8140 Frequency Distribution Amp. The standard reply has always been that no schematics were available from

[time-nuts] Sayrosa 607B Frequency Synthesiser

2018-06-10 Thread gandalfg8--- via time-nuts
Perhaps not a very common item, and probably restricted to the UK, but I have seen these mentioned here before. The 607B was a very nice 2 to 30MHz synthesiser used as the drive unit in the UK Diplomatic Service Piccolo radio system. Both Sayrosa and Piccolo are long gone, and information has

[time-nuts] Tektronix FCA3103 ADEV measurement tau setting problem

2018-05-29 Thread gandalfg8--- via time-nuts
I have a Tek FCA3103 300 MHz counter that measures ADEV as a built in function. When I bring up the settings menu for the measurement, it has an entry window for "tau" (the averaging time, IE "sigma sub y of tau"). It defaults to 200 ms. I can enter larger values and ADEV gives reasonably

[time-nuts] Trueposition GPSDO CTS version for UK buyers

2018-05-24 Thread gandalfg8--- via time-nuts
This is a nice GPSDO but there doesn't seem to be too many about these days compared with the earlier Bliley version, and searching the usual channels from the UK currently seems to brings up just one, Ebay ref 152981122366. 39.99 USD is a pretty good price, and despite being described as

[time-nuts] TruePosition GPSDO Holdover Issues

2018-05-15 Thread gandalfg8--- via time-nuts
Hi Hal, and thanks for that. In my case at least there's no problem with making plots from live data as Lady Heather will do that for me, it's just the time taken to collect the data for each plot that could be an issue. I'd just been wondering aloud whether any of the online simulations for

Re: [time-nuts] TruePosition GPSDO Holdover Issues

2018-05-15 Thread gandalfg8--- via time-nuts
Holdover Issues Hi If you are in the northern hemisphere and looking at GPS satellite tracks, there will always be a “hole” in the track plots to the north. The orbits do not cross either of the poles. More or less they make it about to Hadrian’s Wall and that’s it. Bob > On May 15, 2018, at 12:38

Re: [time-nuts] TruePosition GPSDO Holdover Issues

2018-05-15 Thread gandalfg8--- via time-nuts
hey come out of holdover. You will drop in very quickly ( a second or two), but come out slowly ( many minutes). Local noise can in some cases be enough to put you in holdover. Bob > On May 13, 2018, at 1:13 PM, gandalfg8--- via time-nuts <time-nuts@febo.com> > wrote: > > The

[time-nuts] TruePosition GPSDO Holdover Issues

2018-05-13 Thread gandalfg8--- via time-nuts
The location at 55N, 5W, isn't ideal, there's quite a large hole to the north but this isn't something I've seen here before with any other GPS module or GPSDO. When first noticed I'm sure it was whilst tracking six or seven sats, it was certainly five or more, which is why I commented in the

[time-nuts] TruePosition GPSDO Holdover Issues

2018-05-13 Thread gandalfg8--- via time-nuts
Ok, I give up I've been logging this with Lady H and was watching again this afternoon as the sat count dropped but this time there was no dropping into holdover as the number of sats dropped from four to threedamn, it just carried on doing its thing until the count went up again:-)

[time-nuts] TruePosition GPSDO Holdover Issues

2018-05-12 Thread gandalfg8--- via time-nuts
Today using Lady Heather I have observed the TruePostion GPSDO dropping into holdover as the number of tracked sats dropped from four to three. There does seem to be some hysteresis in the system though, the number of tracked sats eventually dropped to two and then the unit came out of holdover

[time-nuts] TruePosition GPSDO Holdover Issues

2018-05-11 Thread gandalfg8--- via time-nuts
I've had one of the cheap TruePosition GPSDOs running here for the past week, this is the earlier version with the Bliley oscillator, and as Mark reported have been seeing what I consider to be excessive holdover reports from Lady Heather. At 55 degrees north the number of Sats visible can be

Re: [time-nuts] Dual GPSDO - any advantage?

2018-04-10 Thread gandalfg8--- via time-nuts
Unless I copied the number incorrectly earlier it does seem likely that Ebay has pulled that auction. It may still be showing up to those who "bought" them but a straight search on that number returns nothing, either in completed or running listings, nor does it show up now in searches for

[time-nuts] Dual GPSDO - any advantage?

2018-04-10 Thread gandalfg8--- via time-nuts
Is this auction # 273145006434, actually showing at $9.77 here in the UK, and from a recently registered zero rated seller? If so, and given that the auction text, and perhaps the photos too, seem to be taken from one or more of Bob Mokia's auctions dating back a couple of years or so, and

Re: [time-nuts] Z3801A OCXO manual trimming

2018-03-06 Thread gandalfg8--- via time-nuts
Crazy thought.Could you just force a DC offset into the EFC assuming the internal varicap is not out of range. It would be simply adding a resistor to pull up or down to see if you can get a bit of pull and allow the dac to move back in range a bit. Its a band aid. I know its sort of crazy.

[time-nuts] CSAC Project(was CSAC purchase)

2018-01-25 Thread gandalfg8--- via time-nuts
Hi The CSAC spec sheet calls out an aging rate of 0.9 ppb per month as “typical”. There is also a temperature spec of 0.4 ppb. If both are correct for your sample (*and* aging is linear ) you would be out by roughly 10 ppb per year. There also is a voltage stability spec that might be

Re: [time-nuts] European Electronics Systems Radio Clock Model 100

2017-12-15 Thread GandalfG8--- via time-nuts
ngineering / production location). I have several model 100 units and was just about to put one in a timing rack at the museum. Regards Steve G8EBM Original Message Subject: [time-nuts] European Electronics Systems Radio Clock Model 100 From: GandalfG8--- via time-nuts <time-

[time-nuts] European Electronics Systems Radio Clock Model 100

2017-12-13 Thread GandalfG8--- via time-nuts
Does anyone have a service manual or any information on the Europeanlectronics Systems (EES) Radio Clock Model 100. The company was part of Siemens but closed down in 2005. The Model 100 was supplied by Plessey Defence Systems to the UK military. Some models could be GPS disciplined Any

[time-nuts] Programmed Test Sources PTS-x10

2017-11-21 Thread GandalfG8--- via time-nuts
The Programmed Test Sources PTS-x10 manual is available from Mediafire http://www.mediafire.com/file/ak193b371mbb3vc/PTS_X10.pdf ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Programmed Test Sources PTS250

2017-11-17 Thread GandalfG8--- via time-nuts
The PTS250 manual is available from mediafire as either a 55MB standard pdf file or a 41MB OCR pdf file. https://www.mediafire.com/file/v8vd4o33d7ta1rd/PTS250.pdf https://www.mediafire.com/file/5hp2hj1la7wws2s/PTS250%20OCR.pdf ___ time-nuts

[time-nuts] R XSRM Rubidium Standard

2017-09-19 Thread GandalfG8--- via time-nuts
Thanks for the replies to this, both on and off list. Repairs to the wiring turned out to be fairly straightforward and all now seems to be basically functional, but there still remains the problem of the lamp. I am told that the FRK lamp is not a direct replacement, the base is smaller,

[time-nuts] R XSRM Rubidium Standard

2017-09-12 Thread GandalfG8--- via time-nuts
A friend of mine has bought a just out of calibration R & S XSRM Rubidium standard from one of the so called "recyclers" on Ebay. Although the price was good, and it came with the off air receiver, phase meter, and frequency divider, it looks to have been heavily decommissioned with

Re: [time-nuts] HP5090A Off Air Standard Receiver

2017-06-19 Thread GandalfG8--- via time-nuts
wonder if it'd be possible to use a suitably modified PICDiv clocked from a 'standard' 10MHz GPS locked device like the Lucent? On 19 June 2017 at 14:19, GandalfG8--- via time-nuts <time-nuts@febo.com> wrote: I suppose a converter from 198KHz could be an option but I know of at leas

[time-nuts] HP5090A Off Air Standard Receiver

2017-06-19 Thread GandalfG8--- via time-nuts
a frequency converter to produce 200KHz; mixing the incoming RF (198KHz) with 2KHz derived from the output of the unit, On 18/06/2017 21:17, GandalfG8--- via time-nuts wrote: > Hi Pete That's quite good timing, if you'll pardon the expression:-), as I uploaded a pdf version of the 5090A man

[time-nuts] Halcyon OFS

2017-06-19 Thread GandalfG8--- via time-nuts
Hi Clint, There seems to have been very little information available from Halcyon on either the OFS or PFS off air references. All I've seen is the OFS alignment document that Stephen is already sending to you. There were two versions of the OFS1, the later version had similar

[time-nuts] HP5090A Off Air Standard Receiver

2017-06-19 Thread GandalfG8--- via time-nuts
-) Nigel, GM8PZR On 06/18/2017 04:17 PM, GandalfG8--- via time-nuts wrote:> I have a 5090B which I'm hoping to get up and running when it finally > reaches the top of the to do list and my view is that it would be much better to > leave the original electronics undis

[time-nuts] HP5090A Off Air Standard Receiver

2017-06-18 Thread GandalfG8--- via time-nuts
Hi Pete That's quite good timing, if you'll pardon the expression:-), as I uploaded a pdf version of the 5090A manual to mediafire a couple of months ago http://www.mediafire.com/file/u0bf1eips89uo3h/HP_5090A_Ops_and_Service.pdf I know a few others have considered converting the 5090A

[time-nuts] Brandywine GPS-4 OCXO

2017-05-20 Thread GandalfG8--- via time-nuts
Although there doesn't seem to be anything similar in the GPS4 manual, the Brandywine GPS8 manual does carry a table of various oscillator options on page 33. The OCXOs listed there are either from from Milliren or HCD Research. Nigel, GM8PZR Hi, Does someone happen to know what OCXO

[time-nuts] Brandywine GPS-4 OCXO

2017-05-20 Thread GandalfG8--- via time-nuts
I really don't know just how relevant this might be, but some Brandywine products are/were rebadged units from Time and Frequency Solutions in the UK, or perhaps vice versa. I'm not sure if TFS had an equivalent of the GPS4 but certainly both companies sold versions of the GPS8 and the TFS

Re: [time-nuts] Anthorn eLoran

2017-05-10 Thread GandalfG8--- via time-nuts
Yes, noticed here it was off again and am pretty sure you're right about maintenance, just don't remember them starting at 0700 in the past:-) Nigel, GM8PZR In a message dated 10/05/2017 10:58:31 GMT Summer Time, i...@g7iii.net writes: On 09/05/17 20:28, moGandalfG8--- via time-nuts

[time-nuts] Anthorn eLoran

2017-05-09 Thread GandalfG8--- via time-nuts
Iain Young wrote: I now have all four with green tracking lights, so looks good to go Thanks Iain, Also looking good here now so seems like I cried wolf after all, although very happy it wasn't anything more permanent:-) Nigel, GM8PZR ___

[time-nuts] Anthorn eLoran

2017-05-09 Thread GandalfG8--- via time-nuts
Is anybody monitoring eLoran from Anthorn? I'm less than 100 miles from the transmitter but an FS700 has been unable to find the signal for several days. Last time this happened though it turned out to be a local antenna problem so I didn't want to cry wolf until I found time to take a

Re: [time-nuts] HP E1938A question

2017-04-26 Thread GandalfG8--- via time-nuts
; then set the oven to this temperature. I don't know if anyone > currently knows how to make the software do this anymore. > I knew at one time, but have long forgotten. > > Rick N6RK > > On 4/24/2017 5:41 AM, GandalfG8--- via time-nuts wrote: > > I've

Re: [time-nuts] HP E1938A question

2017-04-25 Thread GandalfG8--- via time-nuts
the software do this anymore. I knew at one time, but have long forgotten. Rick N6RK On 4/24/2017 5:41 AM, GandalfG8--- via time-nuts wrote: > I've just received an Ebay purchased E1938A, haven't tested it yet although > I do have a 14 day return option, but unlike previous pur

[time-nuts] HP E1938A question

2017-04-24 Thread GandalfG8--- via time-nuts
I've just received an Ebay purchased E1938A, haven't tested it yet although I do have a 14 day return option, but unlike previous purchases of these the serial number label is missing from the rear of the PCB so I have no obvious way of knowing if the crystal is matched to the PCB. Does

[time-nuts] HP 5090A Frequency Standard manual available

2017-03-31 Thread GandalfG8--- via time-nuts
I've just uploaded a pdf version of the HP 5090A Ops and Service manual to Didier's site at. http://www.ko4bb.com For now at least it's also available at https://www.mediafire.com/?u0bf1eips89uo3h The 5090A was an HP product designed in the UK in the early 1960s and was an off

Re: [time-nuts] ADEV query Timelab and TICC

2017-03-20 Thread GandalfG8--- via time-nuts
Many thanks for the replies on this, what was initially intended as a quick "Hello World" test seems to have become far more interesting:-) I'll forward my results to Tom as requested and see where we go from there. Nigel GM8PZR ___ time-nuts

[time-nuts] ADEV query Timelab and TICC

2017-03-19 Thread GandalfG8--- via time-nuts
Yesterday I used one of John's excellent TICC modules for the first time and initially set up a quick test using the 10MHz output from a Thunderbolt as the frequency reference to measure the 1PPS from an Oscilloquartz Star4 GPSDO, with the TICC output feeding a USB3 port on a Windows 10 PC

[time-nuts] HP53132A Firmware Version 4613

2016-12-28 Thread GandalfG8--- via time-nuts
How similar are the 131A and the 132A ? Is it possible to upgrade a 131 into 132 ? --- Interesting question! I suspect not, not in any straightforward fashion anyway, but I'm sure others would know better than me. >From a quick look at the component level service manuals the

[time-nuts] HP53132A Firmware Version 4613

2016-12-27 Thread GandalfG8--- via time-nuts
I have just uploaded this firmware to Didier's (KO4BB) manuals site so it should be available for download in the near future. Regards Nigel GM8PZR ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] HP 53132A ROM issue

2016-12-27 Thread GandalfG8--- via time-nuts
Hi Colin, All the 5313x counter basic oscillators are indeed extraordinarily poor, and I've always assumed that their only purpose was to demonstrate that the unit was basically functional. A couple of years ago I upgraded a 53132A with serial prefix 3546 from firmware version 3403 to

Re: [time-nuts] FE-5680A GPS discipline board on sale now

2016-05-22 Thread GandalfG8--- via time-nuts
Nick, This looks very interesting but just wondering, will there be an option for end users to reprogram the board themselves just in case there does turn out to be any bugs in the software, and if so would you be making updates available? Regards Nigel GM8PZR

Re: [time-nuts] MSF 60KHz Problems?

2016-05-03 Thread GandalfG8--- via time-nuts
Thanks to all who've commented on this. All the reports I've received have suggested that MSF is behaving normally and I've taken a closer look at my antenna system, where I've found more loss at 60KHz than expected in the multicoupler I've been using. With this bypassed and a stronger

[time-nuts] MSF 60KHz Problems?

2016-05-03 Thread GandalfG8--- via time-nuts
Is anyone else seeing anthing unusual with the MSF 60KHz signal from Anthorn? For the past 24 hours or so, at least, all I've been monitoring here, approx 100 miles from Anthorn, is what seems to be a much weaker than usual carrier that's pulsing at significantly faster than once per

Re: [time-nuts] Datum/Symmetricom BC637 series GPS/Timing Cards

2016-05-02 Thread GandalfG8--- via time-nuts
I now have a copy of this firmware upgrade courtesy of another list member, and just wanted to say a public thank you. Regards Nigel GM8PZR In February Microsemi announced the release of version 8 software (firmware) for these cards, intended to resolve some problems caused by the GPS

[time-nuts] Datum/Symmetricom BC637 series GPS/Timing Cards

2016-05-02 Thread GandalfG8--- via time-nuts
In February Microsemi announced the release of version 8 software (firmware) for these cards, intended to resolve some problems caused by the GPS module, which was at one time anyway a Trimble Ace 3. I have been trying to download this firmware from Microsemi but they no longer accept my

Re: [time-nuts] Adapting my GPSDO to the FE-5680A

2016-04-22 Thread GandalfG8--- via time-nuts
Thanks. I’ve taken your suggestion for the sine-to-square converter. I believe there are two separate commands for tuning the 5680 - one is “ temporary” and one writes through to the EEPROM. I’ll be using the latter, of course. --- I'm surprised nobody else seems to have

[time-nuts] Conditioning Rubidium Oscillators

2016-03-03 Thread GandalfG8--- via time-nuts
I'm sure I won't be the only one receiving newsletters from Precise Time and Frequency Inc, but I thought it worth mentioning their latest white paper as it offers some thoughts on the conditioning of rubidium standards via RS232 control. "Rubidium Control - A Different Approach" can be

Re: [time-nuts] Navsymm Proteus GPS CDU Software

2016-01-23 Thread GandalfG8--- via time-nuts
Hi Thomas, If you haven't already seen them I made a couple of posts regarding this unit last November in response to a similar question, and these might help with running the software etc. I've uploaded a file containing the manual and software to Mega.nz ..

Re: [time-nuts] Tait reference

2016-01-12 Thread GandalfG8--- via time-nuts
Are these the references with a rubidium oscillator ? They seem to have similar models with OCXOs etc. http://www.ebay.co.uk/itm/111862884745 --- Well now, how's this for a happy coincidence. I've just received an email from a friend

Re: [time-nuts] Tait reference

2016-01-11 Thread GandalfG8--- via time-nuts
Thank you Nigel, I've also taken a gamble on one of these units and am keeping my fingers crossed that it has a Rb standard in it. The service manual is most interesting, it looks like I could use one of the two 'loops' to lock a different OCXO, with a little tinkering it could be a very

Re: [time-nuts] Tait reference

2016-01-11 Thread GandalfG8--- via time-nuts
Are these the references with a rubidium oscillator ? They seem to have similar models with OCXOs etc. http://www.ebay.co.uk/itm/111862884745 Hi Adrian, The T801 first seems to have hit the UK surplus market around 2005/2006, I was told a batch of a couple of hundred, and units from that

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-09 Thread GandalfG8--- via time-nuts
> It seems to me that the code they use for the 6731M signal is botched, > anybody who can confirm ? Indeed, see the attached plot (from a recording I made earlier this evening): the master signal is totally lacking the 180 degree phase code modulation, while the slave signal does have it.

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-07 Thread GandalfG8--- via time-nuts
> It seems to me that the code they use for the 6731M signal is botched, > anybody who can confirm ? Indeed, see the attached plot (from a recording I made earlier this evening): the master signal is totally lacking the 180 degree phase code modulation, while the slave signal does have it.

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-06 Thread GandalfG8--- via time-nuts
It seems to me that the code they use for the 6731M signal is botched, anybody who can confirm ? Something's certainly not right at the moment. This morning all was working fine with both Master and Y stations locked on different receivers, but I had to go out for a few

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-06 Thread GandalfG8--- via time-nuts
It seems to me that the code they use for the 6731M signal is botched, anybody who can confirm ? Ah well, as of 1915 the FS700s seem to be locking ok again but still with the monitored signal dropping out from time to time so I guess we just need to be patient and treat it

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-05 Thread GandalfG8--- via time-nuts
Yes, they've been switching back and forth between one or two channels all day, with the one channel state always being just the usual Anthorn Y channel and the two channels always being Master plus the Y channel. Sometimes the overall signal levels have been fluctuating quite a bit at 100

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-05 Thread GandalfG8--- via time-nuts
The experiment continues. Earlier today both the Master and Y channels were showing again, then at 1200 the signal disappeared completely, to be back at 1206 but not long enough for the FS700 to lock before it went again. All good fun:-) Regards Nigel GM8PZR

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-05 Thread GandalfG8--- via time-nuts
Hi David, I've only used Loran specific hardware receivers for actual decoding, so no doubt others will be better able to answer your question re suitable software, but one thing to watch out for is that the stations don't actually transmit a named identifier. With all stations

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-04 Thread GandalfG8--- via time-nuts
k.freebsd.dk_ (mailto:p...@phk.freebsd.dk) > wrote: In message <_576b98.2a1f5672.43bc052e@aol.com_ (mailto:576b98.2a1f5672.43bc0...@aol.com) >, GandalfG8--- via time-nuts writes: >As of 1725, 4th January, Lessay seems to have been transmitting again for >at least 30 m

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-04 Thread GandalfG8--- via time-nuts
>As of 1725, 4th January, Lessay seems to have been transmitting again for >at least 30 minutes, and showing the same or a slightly stronger signal >here on the west coast of Scotland than Anthorn. Are you sure it's not UK trying to rig something up for their eLoran trials ?

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-04 Thread GandalfG8--- via time-nuts
WB8TSL On Mon, Jan 4, 2016 at 2:26 PM, GandalfG8--- via time-nuts <_time-nuts@febo.com_ (mailto:time-nuts@febo.com) > wrote: >As of 1725, 4th January, Lessay seems to have been transmitting again for >at least 30 minutes, and showing the same or a slightly stronger signal >h

[time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-04 Thread GandalfG8--- via time-nuts
As of 1725, 4th January, Lessay seems to have been transmitting again for at least 30 minutes, and showing the same or a slightly stronger signal here on the west coast of Scotland than Anthorn. I've never seen this before, Anthorn is much closer and has always been a stronger signal so

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

2016-01-04 Thread GandalfG8--- via time-nuts
Definitely something unusual going on, overall signal level as monitored on an SDR is significantly lower than normal and seems to have dropped out from time to time, and as of approximately 1750 the master signal is no longer present. Regards Nigel GM8PZR In a message dated

Re: [time-nuts] Problems with WinOncore12 2.1X3 and an M12+T

2016-01-03 Thread GandalfG8--- via time-nuts
I'm currently testing a Motorola M12+T receiver for possible use in a GPS-disciplined 10MHz oscillator. At the moment, I'm using WinOncore12 version 2.1X3 to communicate with it. Hi Phil All versions of WinOncore are pretty old by now, so you might want to try

Re: [time-nuts] Loran-C Norway/France/Germany shutdown

2015-12-31 Thread GandalfG8--- via time-nuts
Looks like Sylt went off-air in addition to the Norway and France stations. Perhaps it is not a permanent decommissioning. It might just be coincidence, but at around 0145 on Jan 1st the Sylt web site link on the Loran-C Europe web site was reporting a 404 not found

[time-nuts] Loran-C Europe

2015-12-31 Thread GandalfG8--- via time-nuts
As far as I can tell, in the 6731 chain there is just one station still operating, this at 0200 on 1st January 2016. My FS700s are reporting no master found so Lessay has gone, and I suspect Soustons also. Without the master I'm not seeing any identification of the one station I'm now

Re: [time-nuts] Lessay and Soutons French LORAN Stations Shutting Down

2015-12-11 Thread GandalfG8--- via time-nuts
Hi Iain I too received this news, sad day indeed:-( I've regularly received Lessay ok on the 2100 when Anthorn has been down so can't say I've ever received a slave, Anthorn, with the master, Lessay actually out of range but although I've not specifically monitored to check I've never

Re: [time-nuts] Navsymm Proteus

2015-12-01 Thread GandalfG8--- via time-nuts
Hi Graham, That link isn't fitted here either, and I don't know its intended purpose, but most of the adjacent component locations aren't populated either so I suspect that on my unit at least there's a fair chance it's not part of the active circuitry, although it is difficult to be sure.

Re: [time-nuts] Trimble Thunderbolt E frequency pulling

2015-11-24 Thread GandalfG8--- via time-nuts
Al, Thanks for the good idea, that would certainly have saved me a bit of work:-), but the switch box inserted in the coax line with the counter input set to high impedance performs the same function, straight through connection with the option to switch in a 50 ohm shunt resistor, and it's

Re: [time-nuts] Trimble Thunderbolt E frequency pulling.

2015-11-24 Thread GandalfG8--- via time-nuts
My bet is interaction of the load current and power supply with the EFC and/or OCXO - Well, I haven't started probing the hardware yet, I was hoping I might get some confirmation first as to whether what I I'm seeing is an anomaly for this one or just par for the course with the

Re: [time-nuts] Trimble Thunderbolt E frequency pulling.

2015-11-23 Thread GandalfG8--- via time-nuts
> Before I start probing any deeper I'd be interested to hear if anyone > else come across this with the Thunderbolt E. Is it thermal? Can you measure the frequency shift before it has time to warm up? Switching the impedance at the counter itself resets any plot

[time-nuts] Trimble Thunderbolt E frequency pulling.

2015-11-22 Thread GandalfG8--- via time-nuts
Please note that this question refers to the branded "Thunderbolt E" GPSDO, in a silver coloured case with blue label and using a single 24V supply, and not the gold coloured "Thunderbolt" that is often found marked "Rev E". Whilst testing a Thunderbolt E I've observed that the

Re: [time-nuts] 3GHz prescaler for Pendulum counters

2015-11-15 Thread GandalfG8--- via time-nuts
Hi Arthur Thanks for the feedback, that's an interesting find and obviously something to keep in mind. As you know Pawel originally designed the prescaler for the CNT85/PM6685, although in earlier Ebay listings he did comment that it also worked for the CNT80/PM6680, and taking a look at

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

2015-11-08 Thread GandalfG8--- via time-nuts
An update on this just in case anyone else interested... I've confirmed that the Symmetricom CDU software for the Proteus GPS unit will run fine under Windows 7 on a 2009 HP dual-core laptop using a Prolific USB to RS232 convertor. There is no option to select baud rates etc in the

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

2015-11-05 Thread GandalfG8--- via time-nuts
Hi Steve, I've got one of these, also came to me new in the box but that was around twelve years ago and other than a short period of testing has stayed there ever since, nothing wrong with it as far as I can remember just too much stuff, too much to do, and Thunderbolts and the like do

[time-nuts] GPS disciplined FE5680A

2015-11-02 Thread GandalfG8--- via time-nuts
Following Nick's comment, under the subject "Z3801A and FE-5680A Allen Variances", that he briefly considered designing a board to GPS discipline the FE5680A, I'm pretty sure that a year or so ago just such a board was suggested as being close enough to completion to warrant a request for

Re: [time-nuts] High Stability OCXO for Pendulum CNT-90

2015-10-27 Thread GandalfG8--- via time-nuts
Hi Stan, The CNT90 service manual is available online from Fluke for their PM6690 rebadged version and is identical to the original, a search on "PM6690 Service" will find it. The manual contains a brief description of the oscillator and a schematic showing both the standard and ovened

[time-nuts] Ulrich Bangert Web Site

2015-10-26 Thread GandalfG8--- via time-nuts
I don't know whether or not this is old news but I've just spotted that Ulrich's web site is live again. http://www.ulrich-bangert.de/index.html Regards Nigel GM8PZR ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] 3GHz prescaler for Pendulum counters

2015-10-15 Thread GandalfG8--- via time-nuts
So much for paranoid file hosting systems with OTT encryption!, the URL for the photos got truncated in the copying:-( Just adding "g" to the end of the link in my original post should suffice, or here, with a bit of luck:-), is the full link...

[time-nuts] 3GHz prescaler for Pendulum counters

2015-10-14 Thread GandalfG8--- via time-nuts
A couple of years ago, my oh my doesn't time rush by when you're having fun?:-), I posted a recommendation for 3GHz prescalers from Pawel Witkowski, an Ebay seller in Poland, for the HP 53131 and 53132 counters. I'm now very happy to report that Pawel has also produced a similar prescaler

[time-nuts] Pendulum Counter Service Manuals

2015-10-14 Thread GandalfG8--- via time-nuts
Spectracom have always seemed a bit "cautious" when it comes to releasing copies of the Pendulum Counter service manuals, I was sent a copy of the CNT90/91 manual when carrying out some repairs a few years ago but only after accepting a non disclosure agreement. Because of that I was quite

[time-nuts] Symmetricom 8130A Software

2015-09-25 Thread GandalfG8--- via time-nuts
In a 2005 White Paper singing the praises of "their", actually ex Datum, 8130A rubidium module, Symmetricom mentioned a small RS232 utility they referred to as 8130Comm. However, it isn't mentioned in the 8130A manual and I can't find anything else about it either online or within my own

Re: [time-nuts] Vanguard Ultra precision Golden Oscillator

2015-08-23 Thread GandalfG8--- via time-nuts
H I think I'm convinced, I had my doubts to start with and now have enough more to ensure I follow a different route:-) Regards Nigel GM8PZR Hi If they are indeed grabbing anything in that package and re-labeling it, I would be very careful. True TCXO’s (full compensation

Re: [time-nuts] Vanguard Ultra precision Golden Oscillator

2015-08-23 Thread GandalfG8--- via time-nuts
Hi Tim, Thanks for your comments and I did wonder about the plating, in the photo for the auction number I gave I couldn't decide if the bottom of the can was corroded or just badly plated. Regards Nigel GM8PZR Mainstream TCXO's moved entirely to surface-mount many years ago. These

Re: [time-nuts] Vanguard Ultra precision Golden Oscillator

2015-08-23 Thread GandalfG8--- via time-nuts
Hi Bob, Just the sort of things I was wondering and lot's of questions indeed, that's why I asked, I didn't want to be the guinea pig:-) Regards Nigel GM8PZR Hi A few things I would wonder about: 1) Is it 0.1 ppm over 0 to 50C (or some other range)? If not, what is the

[time-nuts] Vanguard Ultra precision Golden Oscillator

2015-08-23 Thread GandalfG8--- via time-nuts
The Vanguard ultra precision Golden TCXO, their description not mine:-), has been listed on Ebay for a while now at various frequencies, and the 0.1 ppm spec caught my eye as a possible replacement for the around 6 or 7 ppm oscillator in a DDS function generator I've been using. One

Re: [time-nuts] MtronPTI M9101 GPSDO

2015-08-22 Thread GandalfG8--- via time-nuts
, 2015 at 8:54 AM, GandalfG8--- via time-nuts _time-nuts@febo.com_ (mailto:time-nuts@febo.com) wrote: I've been trying to locate a manual for the MtronPTI M9101 series GPSDOs, an M9103 series manual would probably also be ok. There are references and links online to a PDF manuals section

[time-nuts] MtronPTI M9101 GPSDO

2015-08-20 Thread GandalfG8--- via time-nuts
I've been trying to locate a manual for the MtronPTI M9101 series GPSDOs, an M9103 series manual would probably also be ok. There are references and links online to a PDF manuals section on the MtronPTI web site but those links just bring up errors and they seem to have removed everything

Re: [time-nuts] KS-24361 REF-0 standalone

2015-08-15 Thread GandalfG8--- via time-nuts
I also did a quick write up recently about how I added the 10MHz test point output to my REF-1. Hi Daniel Many thanks for your 10Mhz write up for the REF-1, that's very interesting and a nice bit of detective work. Back in January I took a quick look at the underside of a REF-1 board

Re: [time-nuts] KS-24361 REF-0 standalone

2015-08-12 Thread GandalfG8--- via time-nuts
Hi Adrian, I've recently ordered two pairs to go with my earlier REF-1 units and found there was quite a significant saving on postage, even with the original packaging which I decided was a safer option, but don't forget there's a very high chance these days that you'll get hit with VAT

Re: [time-nuts] KS-24361 EFC Error

2015-08-11 Thread GandalfG8--- via time-nuts
Bevor I heat up the big soldering iron to remove the OCXO, I wanted to ask if anybody else experienced this before and if anybody can confirm that tuning voltage range is indeed 0..6 Volt. If so, replacing the OCXO should cure the problem. Hi Mathias I've not experience your problem

Re: [time-nuts] Loran and SRS FS700 in the UK

2015-07-11 Thread GandalfG8--- via time-nuts
is that the first unit was incorrectly marked and none of them have the option 01 oscillator:-) Regards Nigel GM8PZR In a message dated 11/07/2015 06:45:30 GMT Daylight Time, p...@phk.freebsd.dk writes: In message 10c4f9.7d4eacfb.42d19...@aol.com, GandalfG8--- via time-nuts

Re: [time-nuts] Loran and SRS FS700 in the UK

2015-07-11 Thread GandalfG8--- via time-nuts
the exiasting transmitters. Regards Nigel GM8PZR In a message dated 11/07/2015 07:27:09 GMT Daylight Time, i...@g7iii.net writes: On 10/07/15 22:39, GandalfG8--- via time-nuts wrote: This is a reply to the topic Loran-C reception in the UK with specific emphasis on the Stanford Research

Re: [time-nuts] Loran and SRS FS700 in the UK

2015-07-11 Thread GandalfG8--- via time-nuts
The FS700 data sheet specifies the standard oscillator to be be an ovenised oscillator using an AT cut crystal, and the option 01 oscillator to be an ovenised oscillator using an SC cut crystal. The SC10 data sheet specifies it to be a 10MHz high stability oscillator using an SC cut

[time-nuts] Loran and SRS FS700 in the UK

2015-07-10 Thread GandalfG8--- via time-nuts
This is a reply to the topic Loran-C reception in the UK with specific emphasis on the Stanford Research FS700. Apologies for starting a fresh topic but I'm still not able to take emails from the list due to incompatibility problems with AOL and I don't see how to reply to an existing

[time-nuts] Austron 2100F Manual

2015-05-16 Thread GandalfG8--- via time-nuts
I'm working on a 2100F Loran-C receiver that boots up ok and seems to pass the built in test routines, but after accepting a GRI it just sits in acquire mode. I know the signal is good. I've got the manual for the 2100 timing version, my scan of that is on the KO4BB manuals site if anybody

[time-nuts] For Sale New JLT LTE-Lite 20MHz UK Only

2014-11-25 Thread GandalfG8--- via time-nuts
Having dived in with great enthusiasm as soon as the LTE-Lite was made available I've had it on test for a couple of days now and have not been disappointed, I'm very impressed. However, given the number of existing GPS and other off air systems and projects already running here I have to

Re: [time-nuts] update on LTE-Lite

2014-11-22 Thread GandalfG8--- via time-nuts
Hi Said, Many thanks for your reply. I'd realised that R2 and R3 were in the paths of alternative power feeds but had managed to convince myself that both resistors were shown to be fitted in your auction photos, although I can now see quite clearly that whilst R2 is fitted, R3 isn't,

Re: [time-nuts] Efratom/Datum Starloc II

2014-11-13 Thread GandalfG8--- via time-nuts
Hi Paul, I haven't used the Starloc II, so can't offer any direct help/advice, but I did find manuals for the Starloc II and Starloc II plus when searching for Starloc-Lite data a few years ago. As always I hoarded what I found, which makes this your lucky day rather than mine as I

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