Well, it seems that the first transistor on the driver board is the
culprit. Or, at least, when the transmitter fails, that is where the RF
stops. It is a Motorola MPS-H20
I found the schematic on Ron's site. Thanks Lee.
Bob K6GGO
Hi Guys,
Thanks for the replies. The first thing I thought to do was re-seat
the boards and I did. Well, I didn't re-seat the ones that were
hidden under
the display board (DR-7). I'll take it apart and re-seat them if I
have to, but, I think I have isolated the problem to the pre-driver
board and it
doesn't plug into anything. It is bolted to a heatsink next to the
PA. When it is in a failed condition, I have RF going into, but not
out of, the pre-driver board.
Thanks for the offer, but I already have a set of extender boards.
I will find the problem eventually , I just need a schematic. I will
take another look at Ron's site.
Thanks again,
Bob K6GGO
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