[Boatanchors] Troubleshooting linear amplifier

[Rob Atkinson]

The Centurion bandswitch has two wafers.  One switches both pi network
fixed load caps and pi output coil taps.  The other is actually a
small pc card mounted on the switch (I don't remember exactly) that is
made to switch input network relays.  There is a pc card with separate
input matching networks for each band and relays that open and close,
a pair for each band so the correct network is in line for the
selected band.  The little board on the bandswitch has a ribbon cable
to the input network card.  if the amp isn't working on any band the
bandswitch is probably okay.  Perhaps the 24 v. supply to the input
network board that powers the relays is out.   That would mean no
relays or LEDs or anything else work.  The filament supply transformer
has a tertiary winding to provide the ac that is rectified to get the
24 v. filtered dc.


Sounds like you have your exciter connected to the antenna jack and
the antenna feedline connected to the exciter input jack.

Rob
K5UJ