[time-nuts] New Subscriber, DIY GPSDO project (yes, another one)

[Matthias Welwarsky]

Hi all,

After working on my own take on the GPSDO topic for about half a year, I think 
it's time to admit that I got the time bug. Consequently, I'm subscribing to 
time-nuts.

For the past couple of months, I developed a GPSDO platform based on the 
TDC7200 TOF chip from TI. You're probably familiar with it, it's also in the 
TAPR TICC. It's kind of en vogue right now as it seems. If you want to read a 
bit about the development, there's a thread over at the EEVBlog forum:

https://www.eevblog.com/forum/projects/diy-gpsdo-project-w-stm32-tdc7200/

In its current incarnation, it plugs directly onto a LPRO-101 Rb standard, the 
size of the PCB is about the size of the LPRO front plate. It's meant as a 
frequency, not time standard, consequently there's no output for a time pulse.

I've built two prototypes, one of them was used for early design  tests and 
the second one is now driving one of my LPRO's. I'm mainly using it now to 
work on the control software and tweaking parameters.

Pics or it didn't happen: attached.

The question of performance evaluation will come up. I've ordered a TAPR TICC 
some weeks ago but the shop seems to have bungled the order - no confirmation 
received and credit card not charged, no answer to email - everyone's on 
holiday it seems.  The most stable reference source I have is another 
LPRO-101. Not the best circumstances ;)

BR,
Matthias

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