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Re: [Amps] Series C in amp output

To: Amps group <>
Subject: Re: [Amps] Series C in amp output
From: Bill Turner <>
Date: Fri, 9 Feb 2018 16:58:17 +0000
List-post: <>
------------ ORIGINAL MESSAGE ------------(may be snipped)

On Fri, 9 Feb 2018 17:06:25 +0700, you wrote:

>Amps from Acom and OM, maybe some others, have a large amount of 
>capacitance in series with the output after the power/SWR bridge. In the 
>case of the Acom 1000 this is 6 parallel 10nF/500v disc ceramic 
>capacitors with a 1 megohm (static bleed?) across them.
>Have not seen this configuration on older Alpha amps or others. Can 
>anyone comment on the purpose?
>Martin, HS0ZED

Just a guess:  It might be a safety issue. In case the plate blocking
capacitor shorts, it would prevent HV from appearing on the antenna.
Other amps do this protection with a RF choke across the output of the
Pi network. In case of a blocking cap short, the fuse(s) would blow.

73, Bill W6WRT
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