Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

I found all ICs except the VCXO here in the US, from only two sources; Mouser and Unicorn Electronics. A couple substitutions can be made without affecting the circuit. The 78L06 is the only change i made... substituting an LM317L adjustable regulator for the fixed 6-volt reegulator. I've

Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

Hal wrote: It would be interesting to measure the propagation delay over a day or week, and watch the PLL error voltage over a scale of seconds or minutes. Somewhere I probably still have miles and miles of paper tape that came out of a WWVB phase comparator for many years BGE (before the

Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

Hi Bob I have just realised that MSF may work diffently?? The Anthorn signal is monitored by NPL at Teddington, West of London and frequency off-sets twice a day are published in parts in 10^12 on their web-site.involving lot of averaging I think. They do not recommend using the signal

Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

The last NPL MSF Bulletin showing their errors was over 4 years ago: http://resource.npl.co.uk/time/bulletins/bulletin_archive.html http://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/msf-radio-time-signal The error at a receiver over an interval of a couple of days

Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

Hi It’s not to hard to detect the ionosphere changing and impacting the 60 KHz signals. If you run one of the old style strip chart systems it goes nuts as the sunrise or sunset point passes between you and the transmitter. At some point the signal may even drop by enough for the receiver to

Re: [time-nuts] time sync from cellphone TO microcomputer

Jim Lux kirjoitti: While this is trivial with a GPS receiver, we were thinking about a very minimalist implementation, with a smart phone as the control interface. Forget the smart phone - at least if it's un-rooted Android. I'm not sure how the default time sync is done, it's either by

Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

> On Nov 22, 2015, at 7:47 AM, paul swed wrote: > > As mentioned a nice answer to the wwvb modulation change. > I looked up the parts and it seems that they have gone into the NOS state. > Though you can get some from digikey and such especially in the SOIC > package. Also

[time-nuts] Trimble Thunderbolt E frequency pulling.

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] KD2BD WWVB receiver/decoder in QEX

As mentioned a nice answer to the wwvb modulation change. I looked up the parts and it seems that they have gone into the NOS state. Though you can get some from digikey and such especially in the SOIC package. Also the VCO isn't available. It appears that the Chinese sight has the lmc6484 and

Re: [time-nuts] time sync from cellphone TO microcomputer

On Sun, 22 Nov 2015 11:08:50 +0200 Esa Heikkinen wrote: > > While this is trivial with a GPS receiver, we were thinking about a very > > minimalist implementation, with a smart phone as the control interface. > > Forget the smart phone - at least if it's un-rooted Android. I'm

Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

Hi The most basic gotcha with WWVB is that propagation can (and does) shift the carrier more than a full cycle over the course of a day. That’s at 60 KHz, so one cycle is a lot (as in 16.666 ppm). Even at one second with a not so great receiver and a poor antenna, GPS should give you ~0.01

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

> I'm familiar with the concept of frequency pulling in oscillators but > would have expected the Thunderbolt E output to be better buffered than > this, it's certainly not something I've experienced with the gold cased > Thunderbolts. > Before I start probing any deeper I'd be interested

Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

> I’d have to guess that the PLL would behave better given a 60 kHz reference > rather than a 1 Hz one. But how stable is that 60 kHz reference after going > through, what, a thousand miles of ionosphere or so? One of the reasons for using 60 kHz is to avoid the ionosphere. If you measure