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[Amps] AL-811H problem

To: amps@contesting.com
Subject: [Amps] AL-811H problem
From: Rick Stoneking <w2rds@arrl.net>
Date: Mon, 02 Aug 2004 13:54:56 -0400
List-post: <mailto:amps@contesting.com>
I have a problem with my Ameritron AL-811H that I am hoping someone can give me some help with.

Back in March I pulled my TS-950 out of my station to take it to a multi two operation for ARRL DX Phone. When I brought it back I put the station back together before I had had enough sleep apparently and I connected the output of the 950 to the output of the 811H (and connected the antenna to the input of the 811H). Everything worked just fine with the amp in standby - but when I turned the amp on and keyed the 950 I could immediately see that there was a problem!! Unfortunately I tried keying the rig two more times before it dawned on me to check if I hooked the amp back up correctly.... After getting the connections right I tried it out and the SWR seen by the 950 into the 811H was not good. I can switch bands and the SWR looks good (I have not done a systematic trouble shooting of this yet). I did not have time to dig into it at the time, and I have not used the amp until last night. I again have poor SWR on 20M, but SWR is perfect on 40M (this is what the 950 sees going into the 811H), and I believe that 10M is good from the last time I was trying to figure this out. I printed out the schematic and took a quick look, but it is not drawn in a format that makes it easy to quickly see what the circuitry is looking into the RF out port.

So my questions are: Does anyone have a recommendation on the best way to check out the amp (other than the obvious of put power in on each band, and look at SWR and Pout). What is the mostly likely component(s) that I damaged?

Thanks to all who respond.

73 de W2RDS,
Rick

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