[time-nuts] Ublox 8T

Just a thought re these LEA-M8T modules, but I don't recall seeing any previous mention that the same seller also has two other items with them still mounted on an interface board, these are Ebay items 33619130232 and 333820728021. Yes, they're more expensive, but perhaps the extra convenience

[time-nuts] Symmetricom FTS-1050A Manuals

Following some off-list discussion I have uploaded two Symmetricom FTS-1050A user manuals to the KO4BB manuals site, one for the standard unit and one for the disciplined version. As originally named by me the manuals are... Symmetricom_FTS_1050A_Frequency_Standad_revE_1996

[time-nuts] Rapco 1804M manual and Control Mode Access ?

Hi Chris, I posted a manual to mediafire some time back, have just checked and the link is still working.. http://www.mediafire.com/file/5evbveha6pccc1l/Rapco_1804M_1882M.pdf/file This is a combined manual for the 1804M MK2 GPSDO and 1882M2 MK2 distribution amp, both black fronted

[time-nuts] Old Trimbel Tbot version

That's a Trimble ACE 2 GPS module, not a GPSDO unfortunately. Documentation should be available online but if not I can let you have a copy. Nigel GM8PZR ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

Re: [time-nuts] Alfred Loomis - an early time nut

As well as the CSPAN interview on youtube there's also a printed transcript at... https://www.c-span.org/video/?169779-1/tuxedo-park That's a very good read in itself, and with a rather interesting observation 34 minutes and 17 seconds in:-)... Jennet Conant He bought three Shortt

[time-nuts] FE-5680A tuning vs resonant peaks

There is a lot of information in the Time-nuts archives relating to the FE5680, and all the commands you need for reading and programming the unit are in the manual, as best I remember I just used Hyperterminal. Just in case you're not aware of it, the Google site specific search string

Re: [time-nuts] FE-5680A tuning vs resonant peaks

Hmmm... You mention varying suply voltage by 1.5V, but from where as a starting point? It's been a while since I calibrated an FE5680A but looking back through my notes, doing it "properly" is, or was for me anyway, a non trivial exercise.I'm not familiar with the Windows software mentioned but

Re: [time-nuts] Model # FE2040B

Just a thought, and it is just a thought never having come across one of these before If it doesn't seem to have an oven, does it seem to have any obvious enclosed oscillator module? If it's "only" the 10MHz is high, I'm making an assumption here, is it possible that the 5MHz input is

Re: [time-nuts] MSF Shutdown

frequency measurement Sent: Mon, 4 May 2020 16:10 Subject: Re: [time-nuts] MSF Shutdown NigelInteresting LORAN C is on also? Would you know what GRI?RegardsPaul On Mon, May 4, 2020 at 9:57 AM gandalfg8--- via time-nuts wrote: From NPL.. "A maintenance shutdown of the MSF service to all

[time-nuts] MSF Shutdown

From NPL.. "A maintenance shutdown of the MSF service to allow safe working on the masts and antennas was scheduled to take place from 28 April - 13 May 2020.The planned work has now been completed, and no further interruptions to the service are expected during the period." Loran confirmed as

Re: [time-nuts] Battery for ESE 911 GPS Receiver/Clock

For those of us with an ESE 911GPS receiver / master clock, Digi-Key has announced the end of availability /end of life for the internal SLA backupbattery. Assuming that's not an unusually precise fit there shoud be plenty of alternatives.Just one that comes to mind is the Yuasa NP1.2-6, and

[time-nuts] MSF Annual Maintenance Shutdown

NPL has issued notice that ascheduled maintenance shutdown of the UK MSF service to allow safe working onthe masts and antennas will take place from 28 April - 13 May 2020. In previous years this hasnormally involved a daily off period between say 0800 and 1600 but this year'snotification just

Re: [time-nuts] questions about oscilloquartz 10MHz module

Ah, I now have a full copy of the design paper, "A new kind of view for a Double oven Crystal Oscillator", thanks John. The authors do reference the 8663 but as far as I can see only in a photographic example of what was previously available, before then launching into the discussion of their

Re: [time-nuts] questions about oscilloquartz 10MHz module

I don't have access to the full copy of the quoted reference, so don't know whether or not specific part numbers are quoted, but did note from the abstract the comment. "To allow the assembly on a board of 4TE width, the height of the OCXO is limited to 19 mm" This I would suggest could

Re: [time-nuts] questions about oscilloquartz 10MHz module

Some Chinese sellers have been describing the 8663-XS as double ovened for years now, certainly as far back as 2013 when I bought a couple.However, this is not confirmed by the Oscilloquartz data sheet and I have always believed it to either be wishful thinking or just a marketing ploy.The

[time-nuts] HP 5370A For Sale with John Seamons CPU

I have an HP 5370A Time interval Counter fitted with John Seamons' replacement processor board which cost me a total of approx 350GBP in 2015. I also still have the original processor board. This has seen very little use since then and due to a variety of health issues is unlikely to do so in

[time-nuts] FA-2 Frequency Counter Display

Good point re the display size, guess I hadn't thought that one through too well:-) I'm looking forward to using the FA2 with Lady H but have always run her via a rackmount PC with desktop monitor, I do have a spare Pi sitting around somewhere though so perhaps time to be a bit more adventurous

[time-nuts] FA-2 Frequency Counter Display

The FA-2 really is an amazing wee beastie for the money, and can cram an equally amazing amount of information on to that tiny display, but I'd be more than happy to have it less wee and relocate it into a larger box if it was practical to replace that display with something bigger that could

[time-nuts] Even Seconds Pulse option (1PP2S), HP 58503B

OPTIONAL 1 PP2S OUTPUT (EVEN-SECOND OUTPUT) An even-second (1 PP2S) output is available as an option to the 58503B. The even-second output option provides one pulse every other second, synchronized to the even seconds in GPS time. This is the reference time used in CDMA base stations. GPS

[time-nuts] Am I doing something wrong?

Something certainly seems a bit odd here. The LH plot shows the device reporting itself as a Nortel NTGS/NTBW, even though also indicating a Tbolt log file,  so if it really is a Thunderbolt are you forcing it at start up to run as a Nortel unit? It's also showing zero DAC voltage and that's not

[time-nuts] 5 Mhz to 10 Mhz and 25 Mhz

The NB3N502 is nice, I've used it to provide external references to test gear that wasn't otherwise set up for it, and there's quite a few online references to projects that make use of it. Nigel, GM8PZR You might look at the NB3N502  PLL mult chip. I've used this chip on my rubidium

[time-nuts] WWVB Disciplined Oscillator

That's an interesting document, thanks for the link. For what it's worth, despite the changes to WWWB there is at least one Spectracom 8164 still running as originally intended, well, sort of:-) I have an 8164 in the UK that will run quite happily from MSF, although I must admit to keeping it

Re: [time-nuts] Spirent GSS4100 GPS Simulators for sale

Thanks for the interest, both of these are now spoken for and apologies for not mentioning previously that I was only looking for replies off list, one because it prevents off-topic clogging and secondly because I only receive digests so may have missed some replies anyway. Nigel, GM8PZR

[time-nuts] Spirent GSS4100 GPS Simulators for sale

Some recent list comments have reminded me that I have an "over capacity" of the Spirent GSS4100 GPS Simulator, don't yer just love that "over capacity" psychobabble, you can almost feel the attached redundancy notices, and could well do with shifting a couple. A few years ago an Ebay UK scrap

[time-nuts] FTS-4040/A - Looking for voltage on switching power supply

I believe the FTS-4040 was originallly a Time and Frequency Solutions product and the manual for their FTS-4060 can be found here. www.to-way.com/tf/4060man.pdf That shows the pre-regulator DC power requirements as a nominal 26 V, with a range of 22 to 30 V. I'm not sure how relevant this

[time-nuts] LMU300 PSU - was LM300 Connectors

The LMU300 PSU isn't, physically at least, a standard brick, it's a circuit board that I guess has been purpose built for the LMU300 but no doubt similar in principle to many others. With regards to another comment, I don't recall seeing a bridge rectifier on the input to this PSU, although

[time-nuts] LMU300 Connectors

The power supply is auto sensing and spec'd at +24V or -48V, which implies the polarity would be the same in either case, but the auto sensing doesn't seem to imply sensing right across that range. 24 V range is 22 to 28 V at 6A, -48V range is -40.5 to -57V at 3A, I don't recall checking what

[time-nuts] LMU300 Connectors

Ah, thanks for the update, sounds like I need to take a closer look:-) Nigel, GM8PZR Thank you for your kind explanation.I was just intrigued by those connectors that I didn't know. It's also possible to rescue 6 VCOs from micro circuits and perhaps others components hidden behind their shield.

[time-nuts] LMU300 Connectors

They're QMA connectors, a Google search will find them, but not sure if that will help very much. Your mileage may vary but I quickly decided that whilst buying the complete unit was an excellent way to purchase the GPSDO in new condition, at the price they were selling for then anyway, there

[time-nuts] PTS160 DDS option, was Synthesized Signal Generator query

PTS have always been notoriously unhelpful to anyone aside from original purchasers. Around 15 years ago I was looking for a PTS160 manual and the UK agents were very helpful, and quite happy to request a price on my behalf, but then came back to tell me they'd been told by PTS they couldn't

[time-nuts] Rooftop antenna and splitter

News of this GNSS specific amplified splitter dropped into my mailbox today https://www.sv1afn.com/gps-antenna-splitter.html Nigel GM8PZR ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] NDK Oscillator 30F8297 40MHz

I am looking for any information on an NDK 40MHz 4 pin canned oscillator part number 30F8297, the body is 10mm square and the flange at the base 12mm square, height excluding pins is 5mm and pins are at the corners of an 8mm square. I thought at first that 8297 might just be a date code but

[time-nuts] new WWVB BPSK dev board

I feel guilty now:-) Obviously MSF is strong up here but I was able to receive it from Rugby when I first moved north using a directional LF antenna and was under the impression coverage was still ok throughout the UK, although it seems I was wrong on that. The French station is TDF transmitted

[time-nuts] new WWVB BPSK dev board

Hi Paul, It was shifted over 11 years ago, very obligingly timed to follow my move from the South East to Scotland:-), so I suspect any resulting propogational changes would have been well documented by now. Nigel GM8PZR Hi thank you Bob for the mail Do you realise the 60 Khz

[time-nuts] UK Loran Off Air

For anyone else who might be interested NPL have informed me that the UK eLoran service has been operated since the end of 2105 by Taviga, which is a joint venture between Chronos, http://www.chronos.co.uk/, and the US company UrsaNav Inc. What intrigues me at the moment though is an

[time-nuts] UK Loran Off Air

Oh well, looks like I jumped a bit too soon. It's back on air and an FS700 is locked, but the signal still looking a bit erratic when monitored on an SDR. Nigel GM8PZR ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] UK Loran Off Air

Hi Nigel, NPL have no involvement with eLoran, the contract for that is from Trinity House. The site operator is Babcock Internationalbut I doubt anyone there will admit to knowing what is going on. Hi Alan, I was aware of that, and it's a bit of a long shot anyway, but just thought

[time-nuts] UK Loran Off Air

UK eLoran has been off air since yesterday evening and with it not being an "official" service anymore there's no information available, so no way of knowing if doomsday's finally arrived or it's just a hiccup. It was taken down recently during the day for the annual maintenance program,

[time-nuts] Samsung GPSDO : Chinese surplus

Hi, Nigel To select GPS as the default input port, it was required to tie PIN 39 (of 50-pin FPC connector) to GND. --- Many thanks for the information, I was just coming to announce the same but you beat me to it, sure makes quite a difference knowing that:-) I don't

[time-nuts] Samsung GPSDO : Chinese surplus

I had to make several changes to Lady Heather to work with these... you may have an earlier version. How are you connecting the serial port? In the photo, I did not see the row of four holes that is on the Trimble / Symmetricom versions. --- Hi Mark The serial port

[time-nuts] Samsung GPSDO : Chinese surplus

These are Samsung's version of the "UCCM" series of GPSDOs. Lady Heather now works with them. I had to tweak the code to handle their funky/erratic end-of-line sequences... various versions of CR/LF, LF, LF/CR. Their STATUS screen and some message responses are also a bit different.

[time-nuts] 8 kHz problem in Wavetek/Rockland 5135A synthesizer

Alan, I remember your DDS problems with the 5120A, and of course it was our conversations that led to the notes I mentioned that discussed board similarities. When looking those notes out I came across a previous comment expressing surprise at the small C mains switch that often seem to

[time-nuts] 8 kHz problem in Wavetek/Rockland 5135A synthesizer

So anyway, does anyone know of more info on the 5135A, or of how theguts may have been implemented in detail? Is there a repository of info on various synthesizers here somewhere? I thought I had seen in the past some listings, comparisons, and maybe documents about them here, but nothing

[time-nuts] Loran-C Simulation

Hi Paul, We're certainly very lucky that Anthorn's still up and running, especially as it's only 90 miles from here:-), but I don't know why and wouldn't want to take it for granted. Thanks to the generosity of two other list members, for which I'm extremely grateful, it would seem I've

[time-nuts] Loran-C Simulation

Thanks to Robert and Edesio I now have all the Parallax tools, which I must admit I thought were also lost. Fortunately there's no immediate panic with Anthorn still running for now so I'll still take a look at a possible Arduino alternative, but will also keep hunting for a live SX-B28:-)

[time-nuts] Loran-C Simulation

Although eLoran is still being transmitted from Anthorn in the UK, simultaneously as master and secondary after the Lessay master closed down, it seems to have more of an experimental rather than "official" status these days and with no guarantees as to future availability. Without wanting to