Re: [time-nuts] RFDO - Experience and questions

Actually as I think about it from the earlier part of the thread. Locking to the carrier with a 2-4 second time constant removes the phase modulation since its only in the first 200 ms. The 0 Phase is 800 ms in length or more for all bits. Now to find some nice coils for 162 KHz. Regards Paul On

Re: [time-nuts] RFDO - Experience and questions

A bit more reading if you block the phase comparison from -50ms to 150ms of the tick you get a 0 carrier phase no modulation. That also explains why I thought I could here some sort of phase modulation because there is. So as an example if you use a GPS tick its really simple to block the phase

Re: [time-nuts] RFDO - Experience and questions

I checked out 162KHz at 2000 local and now have what I believe to be TDF using the 67 ft vertical antenna. I am reading -82 dbm near Boston in the US or 3400 miles. A comfortable signal at least in the winter. As a comparison wwvb at 60 KHz is -77dbm some 2000 miles but also not at a 2 MW power

[time-nuts] Thunderbolt Rollover Testing

Plus Trimble's usage is rather misleading... you can do true overdetermined clock in either a static or moving environment... it properly requires more sats to be tracked than necessary to determine the time. Position hold mode (and Trimble's overdetermined clock mode) requires a fixed

Re: [time-nuts] RFDO - Experience and questions

On 3/6/2017 3:47 PM, Graham / KE9H wrote: What antenna are you using that you call the "mini-whip?" Specifically, how long is the "whip?" http://dl1dbc.net/SAQ/miniwhip.html 73 Alberto I2PHD ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] RFDO - Experience and questions

Just for the heck of it fired up the hp3586 on 162KHz tuned +/- 2 Khz both a vertical antenna 67 feet and horizontal dipole 160 ft. Nothing at 1800 utc near Boston Ma. But in the sun for another7 hours. Regards Paul WB8TSL On Mon, Mar 6, 2017 at 9:47 AM, Graham / KE9H

Re: [time-nuts] RFDO - Experience and questions

On Sun, Mar 05, 2017 at 10:42:52PM +, Iain Young wrote: > That's TDF from France. Their equivalent of WWV/MSF/DCF. > Average phase and frequency deviation is > zero over 200msec (see link above for details) This is not quite correct, since the transmitter does not just carry the time data

Re: [time-nuts] 33120A purchase off epay

On 3/5/17 9:14 PM, Christopher Hoover wrote: My HP 33120A Function Generator died. (I'm still trying to fix it, but it isn't obvious what's wrong ... rails check so I'm suspicious the EEPROMs gave up the ghost.) I bought a new one on epay week befor last for a fair price. It arrived and I was

Re: [time-nuts] RFDO - Experience and questions

Anders: What antenna are you using that you call the "mini-whip?" Specifically, how long is the "whip?" Thanks, --- Graham == On Mon, Mar 6, 2017 at 3:57 AM, Anders Wallin wrote: > FWIW, for fun I measured the LF stations MSF, DCF, and TDF just a few days > ago.

Re: [time-nuts] RFDO - Experience and questions

Gilles, I just looked at the signal behavior from the TDFlink you sent.There are 14 seconds worth of very controlled phase. There are additional bits also. As Bob says if the format is controlled you can predict the change and correct the phase. This is exactly what I created for the wwvb BPSK

Re: [time-nuts] Fwd: Dusty 53131A

Hi, To state the obvious, I think the same goes for 53132A and indeed several others. Cheers, Magnus On 03/06/2017 08:19 AM, Bob Camp wrote: Hi 53131’s are dust magnets. It is not at all uncommon for them to fill up with dust, overheat, and die. Popping them open every 10 years or so to

Re: [time-nuts] RFDO - Experience and questions

FWIW, for fun I measured the LF stations MSF, DCF, and TDF just a few days ago. The signals look like this from our site: http://www.anderswallin.net/wp-content/uploads/2017/02/MSF.jpg http://www.anderswallin.net/wp-content/uploads/2017/02/DCF.jpg

Re: [time-nuts] RFDO - Experience and questions

Hi Gilles, You Wrote: Indeed, the station is located in central France with a very powerful transmitter (up to 2MW). It covers all Europe and it was a real pain for me when they stopped broadcasting the France Inter Station. I understand the French government have a consultation out about

Re: [time-nuts] Thunderbolt Rollover Testing

Hi > On Mar 6, 2017, at 1:38 AM, Mark Sims wrote: > > Does it have a saved/surveyed position? With a saved position you can > reasonable time performance with 1 sat. Without a saved position all bets > are off, there is no way for the receiver to determine the >

Re: [time-nuts] RFDO - Experience and questions

Hi One way to “cheat” at recovering a time signal is to demodulate it with known information. Once you know the information from the first “frame” of data (time, date, etc) you can predict what the information in the next frame will be. Yes it does take a little work. If the signal is completely

[time-nuts] 33120A purchase off epay

My HP 33120A Function Generator died. (I'm still trying to fix it, but it isn't obvious what's wrong ... rails check so I'm suspicious the EEPROMs gave up the ghost.) I bought a new one on epay week befor last for a fair price. It arrived and I was surprised/excited to find it had the external

Re: [time-nuts] Fwd: Dusty 53131A

Hi 53131’s are dust magnets. It is not at all uncommon for them to fill up with dust, overheat, and die. Popping them open every 10 years or so to clean them out is well worth the effort. Bob > On Mar 5, 2017, at 8:54 PM, Scott Stobbe wrote: > > Recently the fan