Re: [Amps] Ten-Tec Centurion

[R.Measures <r@somis.org>]

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.

Agreed.
>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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