[time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread Mark Sims
For the money, those are excellent little GPSDOs... providing that it wasn't damaged while being salvaged. I got three different models in from 3 different sources and they all worked well. They are not nearly as tweakable as the Tbolt (nothing is) but they seem to get the job done.

Re: [time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread Giuseppe Marullo
Hello Attila, not cheap at that point, and I already have that ST board(I live few km from ST headquarters, BTW)!. Still licking my wounds from Eclipse-whatever chaintool, ouch, no way I am going to mess with that again anytime soon. I am not in the mood to start another endless project,

Re: [time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread Bryan _
The link on EEVblog is http://www.eevblog.com/forum/projects/a-look-at-my-symmetricom-gpsdo-(ocxo-furuno-receiver)/ the Symmetricom and the Trimble you referenced are almost identical in operation. Issue is receiving one that works, a bit hit and miss. Apparently the next version of Lady

Re: [time-nuts] Anybody want a Thunderbolt power supply?

2016-10-23 Thread Bob Camp
Hi > On Oct 23, 2016, at 2:12 PM, Scott Stobbe wrote: > > I would certainly hope a 7912 would be good enough, because at 1ppm rms in > 0.1 Hz to 10 Hz there is maybe a little over one order magnitude left with > a dedicated low-noise reference. In all likely hood the

Re: [time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread Jim Sanford
Nice! (I had one of those, 20 years ago . . . .) 73, Jim wb4...@amsat.org On 10/23/2016 1:49 PM, William H. Fite wrote: Bravo for boat anchors, Wes. I have a Collins R390 with a tuning gear train so complex it has to go in every 3000 miles for an oil change. On Sunday, October 23, 2016,

Re: [time-nuts] Anybody want a Thunderbolt power supply?

2016-10-23 Thread Scott Stobbe
I would certainly hope a 7912 would be good enough, because at 1ppm rms in 0.1 Hz to 10 Hz there is maybe a little over one order magnitude left with a dedicated low-noise reference. In all likely hood the reference on board the thunderbolt likely has 1ppm pk-pk over 0.1 to 10 Hz band. Tempco for

Re: [time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread William H. Fite
Bravo for boat anchors, Wes. I have a Collins R390 with a tuning gear train so complex it has to go in every 3000 miles for an oil change. On Sunday, October 23, 2016, Wes wrote: > On 10/22/2016 9:22 AM, Chris Albertson wrote: > >> >> You have to remember what this thing

Re: [time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread Attila Kinali
On Sun, 23 Oct 2016 15:32:33 +0200 Giuseppe Marullo wrote: > I am puzzled about what to do, still the total cost of it for a OXCO + > GPS(unit with antenna) + control mcu is 67usd, I doubt I could find > anything like this for a cheaper price new. Yes, it's cheap for a

Re: [time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread Wes
On 10/22/2016 9:22 AM, Chris Albertson wrote: You have to remember what this thing replaces. In ham radio, some people are using vacuum tube oscillators with mechanical variable capacitor tuning. Maybe some advanced rigs use gear drive on the capacitor shaft to allow more exact tuning This

Re: [time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread Bob Camp
Hi There is a *long* list of information on that unit over on EEVBlog. Bottom line is that if you get a good one (you may not) it is a *much* better solution than the other one you are looking at. Bob > On Oct 23, 2016, at 9:32 AM, Giuseppe Marullo wrote: > > Thanks to

Re: [time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread Tim Shoppa
I've been very impressed by the LED/VFD car clocks that come built into cars for the past 20 years. They have to work in temperature extremes from below zero to way above 120F when parked in the sun on a hot day. And every six months at DST time when it's time to reset them, I find they are never

Re: [time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread Giuseppe Marullo
Thanks to all that have answered, as usual very good advices. I am puzzled about what to do, still the total cost of it for a OXCO + GPS(unit with antenna) + control mcu is 67usd, I doubt I could find anything like this for a cheaper price new. Only cheap alternative could be this

Re: [time-nuts] Has anybody checked this? GPSDO in kit

2016-10-23 Thread Bob Camp
Hi You *could* calibrate the nominal frequency a chip very cheaply these days. They may / the may not, who knows. It certainly *is* done that way on very low cost wrist watches. I’d bet that they do and it leaves the factory set within less than 1 ppm. A good generic crystal is still going