I have an Alpha 91b hooked to the K3 (SN 8376) and I'm having an "Odd" problem ... on 75/80 meter SSB, if I run the amp at 45 watts, which is what works on CW without issue, I encounter significant nuisance tripping of the Amplifier to the fault condition. The amp also exhibits a power spike into the 2KW range often times when it faults. If I reduce the power to 30 watts on the K3, the amp runs 1500 watts OK without tripping. Please .... resist the temptation to say "Run at 30 watts then". All other bands ... except 6 meters which I didn't check, do not exhibit this issue. Power out from the K3 is 45 watts and the amp runs 1500 watts out with NO nuisance tripping. I've talked to the tech's at Alpha and at least one other K3 owner has had this same problem. He asked me to check the amp with another radio so, using my spare radio, Yaesu FT-450, to drive the amp I have no nuisance tripping on any band while running 45-50 watts into the amp. Neither radio has ALC hooked up, only the TR relay. Both radios and amp are grounded to the same ground buss. RF calibration was done when the radio was assembled and I have not re-done that process. Any ideas as to why the radio would exhibit a tendency to over drive the amp just on 75/80 meters? Mike N9QR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net
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