I've build a simple distribution amplifier for my GPSDO.

My SYMMETRICOM GPSDO 090-03861-03 with firmware release has a bunch of commands available:

I've done some long term measurements on my GPSDO. The GPSDO has a RS232 based simple command interface.

To have a stable 10MHz reference in my shack, I've ordered a SYMMETRICOM based GPSDO from an Chinese eBay seller. It was delivered in kit form, so no issues with missing CE marking etc.

The GPSDO is build into a sturdy aluminium case with a PCB front panel and an aluminium back panel.

2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.