Hi Mike,
Thanks for posting the photos. They certainly throw up a few issues.
Firstly, I’m confused - you say in your OP that you ‘upgraded from a Classic last year but went the partial upgrade route so I am still using the original Classic bridge.’ But your photo clearly shows a PAW Rosetta Bridge. The Classic Bridge doesn’t have the cutout for the 1090 antenna or the 5volt input and output points.
Secondly, you have a WiFi dongle plugged into Port 3, but you are running the unit on a Raspberry Pi3 which already has onboard WiFi - so you need to take that WiFi dongle out and reset that port (which is USB Port 3) to ‘Auto’ not 19,200 Baud.
Thirdly, you have Port 2 (the one below the GPS) - which is presumably where your FTDI lead goes - configured as ‘Auto’. For direct FLARM integration via the RS232 to USB lead, that port must be configured as ‘FLARM In’ at ‘19,200 Baud’.
As your GPS is now ‘internal’ (inside the Rosetta case), it would also be advisable to remove the case from the GPS to improve cooling.
GPS fix looks fine, but for the avoidance of doubt, please also confirm that the unit is mounted ‘right side up’ in the aircraft (i.e. with the GPS antenna uppermost and where it has a clear view of the sky).
Oh - and yes, the SMA RF connector looks fine.
Finally, please remember that the depiction of known position targets (ADSB, FLARM and MLAT) on SD is determined primarily by your vertical altitude filters in SkyDemon/Navigation Options/Show within Vertically. If you have this set too tight, you won’t see any of the above traffic outside that height above or below your current altitude.
Please let us know if the situation improves after making these changes.
Regards
Peter