Fwd: [AMPS] SB-220 High input SWR and transceiver fold back

[ToddRoberts2001@aol.com]

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Do you have any kind of tuned input on the SB-220? A solid-state transceiver 
could behave badly if there is no tuned input at the amp. What kind of coax 
cable are you using between the exciter and the amp? I have seen too many bad 
coax jumper cables in the past to count. Do you have the amp tied in to a 
good station ground? Is the exciter strapped to a good ground also? There 
could be RF feedback floating around your shack. A few things you might want 
to double check. 73 Todd WD4NGG.

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Reply-To: <johndb@dbtechnet.com>
From: "John den Boer" <johndb@dbtechnet.com>
To: "Amps" <amps@contesting.com>
Subject: [AMPS] SB-220 High input SWR and transceiver fold back
Date: Wed, 21 Feb 2001 05:30:34 -0800
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I have been having a problem with my FT-847 transceiver output power being
folded back when driving a SB-220 in SSB mode due to erratic SB-220 input
SWR.  The input SWR of the amplifier is varying between 1:1 and 5:1.  As the
SWR increases, the power of the transceiver reduces due to the automatic
fold back circuits and therefore amplifier output power reduces accordingly.
If the transceiver is set to CW then SWR is 1.2:1 and amplifier produces
full output.

My previous TS-830S exciter always produced correct output ... but it didn't
have any fold back circuits either.

Is this a normal situation using solid state exciters?

Thanks for any comments.

John (VE7JDB)


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