The module has made it back from testing by Paul PA0PBZ, many thanks for that!!
With the original Symmetricom OCXO it works
fine.
I decided that now that the module has been tested to be OK it was time to ensure I have a proper GPS antenna.
A fellow ham operator had some surplus GPS roof antennas available, plus a really neat inline GPS antenna amplifier.
Both Symmetricom branded. I put the amplifier inline with the antenna cable to my existing roofmounted GPS antenna.
That really helped, suddenly the UCCM module happily received sats! See the LH screenshot. The 'interesting' signal strength
pattern is due to the fact that the antenna is mounted on the side of a VHF/UHF antenna pole. But works A-ok as far as I am concerned.
Not having to climb on top of the roof in the autumn rain has me sold on the amp
The UCCM currently has the Trimble OCXO fitted, which works just as bad as before
Paul PA0PBZ has sent me some ideas on how that might be fixable, next step I'd say..
Wilko