Mike, I have used my K3 and A91b successfully on all bands from 160 through 10 meters for over a year. No problems with SSB on any bands. I have run full output on 160 and 80/75, both SSB and CW. Net: I can't think why you're having trouble.
I do have one problem on the low bands that I do not associate with the K3 but might be playing into your situation somehow. I believe my house wiring is picking up RF, which kills my DSL connection whenever I run high power on 160 and sometimes when I only run 100W barefoot from the K3. Have you run the setup into a dummy load? Brian K1LI On Tue, Jan 19, 2010 at 3:59 PM, <[email protected]> wrote: > 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
