Could it be the tuned input circuit in the amp you are driving
just does not have enough range to bring it into a perfect match
with your driver? The mismatch may be more noticeable the
longer the length of coax between the xcvr and amp.
You could try using a regular transmatch or antenna tuner
between your rig and the coax going to the amplifier input and simply
tune that for a flat SWR to keep your xcvr output happy.
After all a "tuned input" built into an amplifier is nothing more
than a small transmatch with small slug-tuned coils that can
be optimized or "tuned" broadly for each band. Nothing wrong with
using an outboard transmatch and tune it for the band you are
operating on.
Also I would be sure to use the best quality coax with double
shield between the xcvr and amp input.
73 - Todd WD4NGG
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|