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Re: [Amps] Ten-Tec Centurion

To: "Ian White, G3SEK" <>
Subject: Re: [Amps] Ten-Tec Centurion
From: R.Measures <>
Date: Thu, 11 Nov 2004 06:42:51 -0800
List-post: <>

On Nov 11, 2004, at 4:53 AM, Ian White, G3SEK wrote:

R. Measures wrote:
Assuming the spike is at the leading edge of the transmitted signal, then an
rf sensing circuit could delay the turn on of the rf amplifier until after
the passing of the spike.

Colin -- The problem is that incoming RF does not go on a mini-vacation immediately after the spike, it merely backs down to the ALC level that is set. Thus, there is RF on the closing NO contacts while they are bouncing. This results in hot-switching and current-transients.

Also there are two sets of relay contacts, at input and output. These contacts will bounce, and even if they are on the same DPCO relay, they will not bounce exactly together. This means the PA can have some exciting moments

Englanders, the masters of understatement.

when the input relay is closed but the output contacts are not. The PA then has full drive but no load, which could lead to very high voltages across the tank components.

Ian -- Would not the Load-C be likely to arc with no load?

All of that can happen without any kind of oscillation, either at the signal frequency or parasitically at VHF.


Richard L. Measures, AG6K, 805.386.3734.

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