I built the AN762 amp along with 6 low pass filters with parts bought from
Communication Concepts.


Hi Michael, Just some thoughts on your problems with the AN762.

I connected all parts with short runs of RG-58, but a lot of the power seems
to get lost in this system. If I'm lucky I can get 100W out.
The short runs of RG-58 should not produce any noticeable loss. I would look
at Tx/Rx relay and the filter bandswitch.
Another thing to consider is how you determined the power gain of the PA
before and after you put it in the enclosure. Make sure all the measurement
parameters (frequency ect.) are exactly the same.
Another thing to remember is that the circuit board is the only thing that
has a power gain. All the cabling, switches, and relays will have some loss.
If you are losing 80 watts, it is probably in one section, and it should get
pretty hot. Of course the circuit board will get hot, it does in normal
operation. Look for some of the stuff you added getting hot. Also does the
circuit board get hotter now than it did before you enclosed it?


73 Gary N4AST