4600 KHz is the threshold for 80/60 meters. Below is 80, above 60. Your KPA is trying to decide which band it needs to be on and is switching back and forth with the modulation as it causes the frequency to change. The delay is simply the band change. It would require firmware changes to fix this one.
73, Jack, W6FB > On Jul 20, 2018, at 6:58 AM, W1IE <w...@jetbroadband.com> wrote: > > Good morning, > > I have an interesting problem in which I hope the group here has an easy > solution. > > My KPA 500 is hooked to a TS-2000 outputting 20 watts to the KPA500 and > displays the following abnormalities : > > 1. At frequencies between 4581 kc to 4601.6 (we are working on MARS > frequencies) using USB and a waveform of M110A, the following > characteristics are observed. > 2. The amplifier stops transmitting briefly (less than a blink of an eye) > and then resumes during a M110A transmission at multiple random times. > 3. Does not appear to happen when using voice, although some stations on the > MARS net have mentioned that my transmissions sometimes do drop to very low > levels. > 4. This drop out does not occur: > a. On frequencies outside the range as listed in item #1. > b. If the emission is any other type other than USB/LSB. > c. When I turn off the amplifier and only transmitting using the > TS2000 at 100watts. > 5. Occasionally, but not every time when this event occurs I hear a relay > inside the KPA500 click > 6. I did the following tests in an attempt to located the problem. > a. The conditions occurs whether I am attached to any one of the > antennas I have here. > b. It also occurs when a dummy load is attached. > c. It still occurs when I switch out KAT500 antenna tuners (I have > two of them). > > > > > Initially, my thoughts were that the frequency range seems to lie some where > in the boundary between 3.5 and 5.0 band > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to jackbrin...@me.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
