[Boatanchors] Troubleshooting linear amplifier

[Bry Carling]

Thanks. No, that is not it.

The voltage and signals are switching the input network just fine. I have checked all of that thoroughly 
earlier.  That is why I have drive on each band. The problem has something to do with non-resonance 
in the PI Network. The puzzle continues.

> Date: Mon, 11 Apr 2016 08:51:23 -0500
> Subject: Re: [Boatanchors] Troubleshooting linear amplifier
> From: ranchorobbo at gmail.com
> To: duvallddennis at gmail.com
> CC: af4k at hotmail.com; Boatanchors at mailman.qth.net
> 
> 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