Hi all (and sorry about the blank post-I don't know what happened there).
I am experiencing a continuing and repeatable problem with my KPA-1500 on 6m. With the amp in bypass I am able to operate normally with my K3s, but the amp's meter is showing a 1.8 to 2:1 SWR on that band, despite measurements on an AA-230 analyzer and the SWR meter on the K3s itself showing it virtually flat (no more than 1.2:1). Once the amp is placed set to operate it's still showing SWR measurements of 1.8:1 to 2.1:1 consistently when delivering power. If the tuner is bypassed I can't run more than about 600W out before it faults. If I put the tuner in and click it to tune, it will deliver power just fine at 1200 or 1300 Watts for ONE FT8 transmit cycle. When it goes to transmit again it hard-faults with too much reflected power. Using 100W straight from the K3s there is no issue whatsoever, but *any* level of power from the KPA is liable to trip the excess reflected power sensor on the amp. At first I thought I had an antenna problem, but yesterday I put up a brand new 6m LFA and it's doing the same thing. This coming week I plan to replace the feedline with LMR-400--it's got a combination of 3/8" hardline and RG-213 at the moment. Any thoughts on what might be going on here? Is there a known-issue on 6m with the KPA? --------------------------------------------- 73 and Good DX Peter, W2IRT President, North Jersey DX Association DXCC Card Checker Letter O Manager, ARRL Incoming 2nd District QSL bureau ______________________________________________________________ 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 Message delivered to [email protected]
