6500, latest 188.8.131.52 software release.
There seems there is a problem whenever I use extra RF gain. Using just the one panadaptor on any band and any RF gain: no problem at all. However if I add a second panadaptor and increase the gain on either of them (+10 and even more so with +20) the RX noise level of both immediately shoots up (from, say, -120dBm to around -60dBm, and sometimes fluctuates rapidly, sometimes remains fairly constant at -60dBm). Reducing the RF gain usually reduces or eliminates the problem, as does returning to just the one panadaptor.
Strange it doesn’t happen when only one panadaptor is present. A question possibly associated with this: if I adjust the RF gain on, say, Pan 2 whilst monitoring Pan 1, the RX gain of Pan 1 is also adjusted. For example if I have Pan 2 on 10m and Pan 1 on 17m and adjust Pan 2’s RF gain, I wouldn’t expect any change in Pan 1’s level. Well, it does change. Obviously, because of the problem I’ve first reported I can only reduce the gain from 0 to -10 otherwise everything is just wiped out.
It looks like a hardware problem to me, but I really hope it isn’t! Anyone ideas?
Jeff - G4IUA