Thanks very much everyone for your replies. I've got to wait until after Christmas before I can get time to work on it, but I will have a good look. I have access to all the gear, test sets, spectrum analyzer, scope, sig gens, etc. I need to study the diagrams a bit before, so it all makes sense, but I like the idea of checking the RX sensitivity.
As soon as boxing day is over, I'll have a look and report back. I may also curious as to 4 metres on the radio, bringing the PA out to SMA with hardline and having an external filter if the PA does any power on 70 MHz.
I'll report back once I've done some work. Cheers for all the advice, it's much appreciated.
73 all, and seasons greetings.
George Smart, M1GEO.