Re: [time-nuts] GPS Antenna on Tower.

http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx Have a look at the best receiving antenna I know about. The tower must have cooling tubes coiled around it because of the sun heating one side will make it bend away from the sun, and turn this way all day. The cable and doom is also

Re: [time-nuts] Powering up a long inactive 5061A

Hi, My humble thanks to all who provided feedback on the best approach to take with the '5061A. I do rather take the point about slow transitioning power not being ideal - I think I'm mentally digging that up from a bygone era! :) One suggestion was to at least consider using a current

[time-nuts] Yet Another GPSDO design - Timing on the move

Dear all, After a hiatus of seven years I have finished the first version of my GPSDO design. The full schematic can be found at https://drive.google.com/file/d/ 0B7mNymXfcKMqaFcyRXdURC1KMXM/view?usp=sharing (Google Drive seems to guess the file type wrong; Acrobat opens the file just fine). Its

Re: [time-nuts] TBolt help - port stops talking

hi i have powered down a few times and no no joy thanks dave On Mon, Jun 19, 2017 at 1:58 PM, Mike Naruta AA8K wrote: > On 06/19/2017 04:16 PM, Dave Mallery wrote: > >> hi >> >> My Tbolt has been running for a long time, since the final group buy. >> >> It is still running

Re: [time-nuts] TBolt help...

I had a T-Bolt 'failure' when my -12V supply died. I am aware of another event on the list when the solder connection at the -12V connector to the t-Bolt failed. Make sure the -12V is reaching the PCB for the T-Bolt. Hope this helps. Joe -Original Message- From: time-nuts

Re: [time-nuts] TBolt help - port stops talking

On 06/19/2017 04:16 PM, Dave Mallery wrote: hi My Tbolt has been running for a long time, since the final group buy. It is still running (indicated by the 10MHz output) but there is no data coming out the serial port. LH says so and so does my lil TSIP monitor, as well as my rs-232 cable

Re: [time-nuts] SR620 TCXO calibration

Yes please. ... -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby (Kirkby Microwave Ltd) Sent: 19 June 2017 21:03 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] SR620 TCXO calibration On 19 June 2017

Re: [time-nuts] TBolt help...

Hi Dave, There was one other report of something similar over the past ten years. I did not look into it. Since your TBolt was part of the group buy, I'll send you a new one. Contact me off-list. But can you double check the -12 V power supply voltage for me? Anything between -7 and -15 is

Re: [time-nuts] TBolt help...

Hi First thing to check is the solder joints on the 9 pin connector. They have been a bit of a problem on other TBolts. After that, check the voltage on the data out (TX) pin. It should be negative by at least 3V and more likely 5V. If it’s not, check your negative supply into the unit and

Re: [time-nuts] SR620 TCXO calibration

actually I think mine also has an OCXO D. -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby (Kirkby Microwave Ltd) Sent: 19 June 2017 21:21 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] SR620 TCXO

Re: [time-nuts] SR620 TCXO calibration

I should have added, mine had an OCXO - I just see you had a TCXO. I don't have the SR620 any more. I swapped it, along with a HP 4.2 GHz signal generator, for an HP 4291B impedance and material analyzer. Dave ___ time-nuts mailing list --

[time-nuts] TBolt help...

hi My Tbolt has been running for a long time, since the final group buy. It is still running (indicated by the 10MHz output) but there is no data coming out the serial port. LH says so and so does my lil TSIP monitor, as well as my rs-232 cable monitor/breakout devices. I have tested all the

Re: [time-nuts] SR620 TCXO calibration

On 19 June 2017 at 15:35, David C. Partridge wrote: > I think I'm being dense, but I can't work out how to get this thing to > display CalDat 04. I have managed to get it to display CalDat 0 value, > but > can't work out how to step through to view adjust CalDat

Re: [time-nuts] Halcyon OFS

Use what you can. Regards On Mon, Jun 19, 2017 at 1:53 PM, Bob kb8tq wrote: > Hi > > So let’s see, 140 feet that way would be three yards over … that way > crosses the street and makes > it to the back of his yard …. this way is past the back of the lot and > four lots down ….

Re: [time-nuts] Halcyon OFS

Hi So let’s see, 140 feet that way would be three yards over … that way crosses the street and makes it to the back of his yard …. this way is past the back of the lot and four lots down …. that other way is over the other street and into his front yard …. Hmm …. not likely to work here :)

Re: [time-nuts] Halcyon OFS

Ole I may be able to give you some insight. I live some 1500 + miles from WWVB in the US on the east coast. Not a favored transmission direction. So for years I did the small loop and loop stick game. Then 5 years ago I built a real shielded loop. 10' X 10' 800 ft of wire approx. Then a preamp.

Re: [time-nuts] Halcyon OFS

It seems I have a hybrid, on the front panel it's an OFS-1, on the serial number label it's an OFS-1A and on the PCB it's an OFS-2. http://imgur.com/a/brRou On 19 June 2017 at 17:40, Ole Stender Nielsen wrote: > I got a Halcyon OFS-1 a while back, and found it was

Re: [time-nuts] Halcyon OFS

I got a Halcyon OFS-1 a while back, and found it was virtually impossible to use here in Denmark, which seems to be located too far away from the Allouis (162 kHz) or Droitwich (198 kHz) transmitter sites. One major design flaw of the OFS-1 is the digital divider used to divide an analog

Re: [time-nuts] GPS Antenna on Tower.

On Mon, 19 Jun 2017 08:52:37 -0400 Dan Kemppainen wrote: > So, what sorts of things are done for high precision survey work? I > would guess a sturdy mount, good sky view, no reflections, good antenna, > no nearby radiators, etc. Those all seem like common sense stuff.

Re: [time-nuts] GPS Antenna on Tower.

Hi If you go totally insane, you build a 30’ tall concrete monolith in the middle of a wide open field. The antenna and ground plane go on top of the monolith. You then grab your chain saw and start knocking down any trees, towers, or homes that happen to obstruct your perfect view. :) Indeed

Re: [time-nuts] GPS Antenna on Tower.

Hi Bob, So, what sorts of things are done for high precision survey work? I would guess a sturdy mount, good sky view, no reflections, good antenna, no nearby radiators, etc. Those all seem like common sense stuff. But for applications that really matter, what sorts of things might be

Re: [time-nuts] Halcyon OFS

Mine is somewhat different to that model, the case is the same as the leftmost one but the board is quite different to the middle picture. I'll post some links to pictures of the internals and start drawing out the circuit over the coming few days. On 19 June 2017 at 14:29, paul swed

Re: [time-nuts] Halcyon OFS

Great pix can be found here and absolutely can easily be reverse engineered. https://www.vintage-radio.net/forum/showthread.php?t=97999 Very simple straight forward design. Regards Paul WB8TSL On Mon, Jun 19, 2017 at 9:25 AM, paul swed wrote: > Hello to the group. I suspect

[time-nuts] SR620 TCXO calibration

I think I'm being dense, but I can't work out how to get this thing to display CalDat 04. I have managed to get it to display CalDat 0 value, but can't work out how to step through to view adjust CalDat 04. Once I do get there, how do I manage to adjust the CalDat value while observing the

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

I'm sure there's various ways of doing it, a phase locked oscillator perhaps, dividing 10MHz by 50, or perhaps my preferred lazy method of dividing 800KHz by 4:-) It really doesn't really matter all that much, the initial comment was just that it might be better to provide a 200KHz signal

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

Hi If it’s an off the air receiver, it’s got front end filtering and all the rejection you would want to lock on to a single carrier. 200 KHz and 2 KHz fed into an XOR would give you what you likely need. A PICDiv should be able to generate both those “tones” without a lot of crazy effort.

Re: [time-nuts] GPS discipline oscillator vs phase lock

On 6/18/17 9:29 PM, Hal Murray wrote: jim...@earthlink.net said: Well, at JPL we regularly lock two crystal oscillators together that are over a billion km apart with added Allan deviation of less than 1E-15 at 1000 seconds with a radio link at 7.15 GHz. It's how we measure the distance and

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

And Attila wins the reflector for today!!! __ Clay Autery, KY5G On 6/19/2017 2:29 AM, Attila Kinali wrote: > > You aren't seriously asking a time-nut what the point of doing something is, > are you? We are doing what we do because we think it's fun. Because we > might learn

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

If it's just locking to the carrier I 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 wrote: > I suppose a converter from 198KHz could be an

Re: [time-nuts] Halcyon OFS

Hello to the group. I suspect I will never see such a unit in the states. Also it wouldn't be useful. But that said its sounds as though its a traditional simple receiver that should be able to be reverse engineered. At least for the signal and locking chain. If a micro is involved then things get

[time-nuts] HP5090A Off Air Standard Receiver

I suppose a converter from 198KHz could be an option but I know of at least one other experimenter who's run into problems with the Teleswitch modulation on the Droitwich signal when trying something similar with a 5090A. Although, from one point of view, running it from the present 198KHz

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

How about building 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

Re: [time-nuts] Halcyon OFS

Thank you Stephen, Nigel, I'll take some pictures of the board in my OFS-1 but it doesn't match any of the pictures I've tracked down so far. Interesting that the board mounted on the rear of the enclosure with the trimmers appears to be Vero or perf board of some description... On 19 June 2017

[time-nuts] Halcyon OFS

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

Re: [time-nuts] Halcyon OFS

Hi Clint I have had one of these from new. It divides the amplified incomming carrier by either 99 or 81 (4526) and phase compares with 2kHz from the divided down 10MHz discrete VCXO to phase lock the 10MHz. My unit serial number 1151 has no other crystals in it. It possible they are filters

[time-nuts] HP5090A Off Air Standard Receiver

Um... I'm sure this response was well intended, so thank you for that and for the advice, but I do feel that Attila's earlier reply explained my reasoning remarkably well. Under consideration is the taking of a very nice example of an older and now unusable off air frequency

Re: [time-nuts] Halcyon OFS

I have a little Halcyon information I managed to find a few years ago when I acquired a couple of PFS units. It includes a brief document on OFS alignment. I'll mail the documentation to you directly... On 19/06/2017 10:17, Clint Jay wrote: > I have been given a Halcyon Electronics OFS1

[time-nuts] Halcyon OFS

I have been given a Halcyon Electronics OFS1 standard which seems to work, it's a version that has 198KHz and 162KHz selector on the fron and after a reasonable period of time it displays 'lock' and gives a nicely stable 1,10 and 10 MHz output on the front panel BNCs, (I know, it should be 1,5 and

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

On Sun, 18 Jun 2017 21:52:04 -0400 Ruslan Nabioullin wrote: > What in the world would the point of that be!? It appears to be a > long-obsolete product, so have you searched for more modern time code > receivers from timing instrumentation (Meinberg, Brandywine, et al.)

[time-nuts] Opening for an analogue design engineer in our team at CERN

Dear all, Sorry in advance for the slightly-OT message. We are looking for an analogue designer to help us with signal conditioning in data acquisition applications and also in low-jitter clock signal generation and distribution for White Rabbit