To: | "R. Measures" <r@somis.org> |
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Subject: | Re: [Amps] Alpha 86 |
From: | Vic Rosenthal <vic@rakefet.com> |
Date: | Mon, 24 Nov 2003 19:59:19 -0800 |
List-post: | <mailto:amps@contesting.com> |
R. Measures wrote:
I will be happy to send it to you at no charge, Rich. I think the question "why did this burn out" is interesting, because I know the individual who was operating it when it happened, and he did not hot-switch it. He was attempting to load an 80-meter coax-fed dipole on 160 meters (it was late, in a contest, etc.). The contacts which burned were used to switch padders in parallel with the loading capacitor of the Pi-L output circuit. The question then is, "Why didn't the amplifier trip off from excessive SWR?" My theory, which I will happily hear attacked or supported, is the following: The amp doesn't exactly trip on SWR, it trips on reflected power. My sleepy friend found a setting of the controls which was highly underloaded, producing a very high circulating current in the tank circuit, and very little power out (and hence very little reflected power). The current was enough to burn the contacts. He probably was not driving it very hard, or it would have tripped on grid current. I'll send you the switch tomorrow, Rich. Vic K2VCO _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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