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Author Topic: AL80B HIGH SWR  (Read 1661 times)
N2YHN
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« on: January 01, 2006, 03:08:13 PM »

Hello All, i have an AL80B that up until a few weeks ago ,performed flawlessly , last time the amp was turned on and keyed it showed no outupt , the swr's were off the scale , the tube lights and everything else looks ok(doesnt smell like anything is burning) ,checked all jumper cables etc all seem ok , swrs are normal when amp is off and radio is barefoot the amp is 7 years old and in decent condition,did the 3-500z go bad ? thanks to all and happy new year!
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K0BG
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« Reply #1 on: January 01, 2006, 03:41:46 PM »

The obvious questions are, did you try it into a dummy load? Where are you measuring the SWR, and with what?

The simple truth is, you cannot rely on internal metering in most transceivers. Secondly, you have to eliminate as many variables as possible, especially reactive ones like antennas.

Based only on what precious little definitive information you gave, I can only assume you are speaking about the INPUT impedance of the amp when it is in operation. Personally, I'd doubt it is the tube. Rather, I'd suspect the transfer relay(s) which because of their inherent design, can oxidize when not used regularly. Without better info, it's a WAG.

Alan, KØBG
www.k0bg.com
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