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.
Inside is an orignal, clean SYMETRICOMM GPSDO board mounted on an carrier PCB.
10MHz output at 50Ohm
Spectral purity of the 10MHz signal at 50Ohms
1PPs output at 50Ohms
1PPS risign edge at 50Ohm
1PPS falling edge at 50Ohm
10MHz sine output from the GPSDO vs. my 10MHz DCF77 reference square wave