To: | Andy Forsberg <CS-Imaging@prodigy.net> |
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Subject: | Re: [Amps] Alpha 87A troubles with fault 17 |
From: | Rob & Terri Sherwood <rob@sherweng.com> |
Date: | Thu, 22 Jan 2004 11:43:44 -0700 |
List-post: | <mailto:amps@contesting.com> |
I have a manual tune version of the amp, an Alpha 89, along with an
Alpha 99. See Walt, W0CP's web site on a fix for the 781 ALC spike
problem. (W0CP.com) While the spike is there with the Icom, I have not had nearly as much of a problem like you have with faults. My ALC spike on CW, at worst is as follows: Set the amp for steady state out put of 1 kW, and the spike can be as high as 1.5 kW. My IC-706MkIIG has a modestly worse spike than the 781 (before the mod). With all the faults you have listed, I don't think you amp is working properly. Is there a possibility your have some kind of an arc problem on your transmission line? At one of my QTHs I have a 40 meter extended double zepp fed with a Johnson KW Matchbox. At one point on the transmission line the open wire feeders got squeezed too close together. When I was tuning up with a carrier, as the output approached 1.5 kW the reflected power would go from about 20 watts to full scale and the amp would fault on excessive reflected power. After inspecting the feedline the next day during daylight, I found that the feedline had been arcing at one point. If you have a coax system, and a balun on a beam, for instance, it is possible the balun could be flashing over. I had this difficulty with a Hy-Gain BN-86 once on a Hy-Gain 402BA. 73, Rob Sherwood, NC0B Andy Forsberg wrote: Hi All, _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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