To: | amps@contesting.com |
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Subject: | Re: [Amps] please help with weird problem |
From: | "Ian White, G3SEK" <G3SEK@ifwtech.co.uk> |
Reply-to: | "Ian White, G3SEK" <g3sek@ifwtech.co.uk> |
Date: | Sat, 29 Jan 2005 09:06:58 +0000 |
List-post: | <mailto:amps@contesting.com> |
We Never Close - your morning shift has started in Europe! Steve Thompson wrote: k8bb@comcast.net wrote:Oh amplifier gurus ... this is rather long ... I have searched the archives, but I don't know what I am looking for ... Groaning sounds, dimming lights and crazy meter readings - all happening together - are classic signs of RF feedback, possibly leading to the oscillation that Steve describes. It sounds very much like something has suddenly become un-grounded. Go find that ONE thing, and fix it, and everything will be OK again. DO NOT TEAR YOUR WHOLE STATION APART! That is the worst thing you can do! Remember that *almost* every part of your station is still perfectly OK... so your aim should be to disturb as little as possible. Leave everything as it is, and then very selectively check ONE thing at a time. If it's OK, put it back EXACTLY as you found it. Don't automatically blame your amplifier. Sometimes it's simply the higher power that triggers a fault somewhere else, and there may actually be nothing wrong with the amp itself. Prime suspects are all those PL-259 jumper cables. Unless you've been very good about soldering the shields, every jumper contains two un-grounding faults, just waiting to happen.
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