Hello Wise and Powerful Reflector; I am experiencing a confounding problem with Ham Radio Deluxe, Digital Master 780 and my K3. I've determined that HRD polling the K3 is introducing a croaking pulse-like noise into my signal chain. I know it is HRD because if I quit out of HRD, no noise. In fact, if I merely click and hold on the Radio pane in Digital Master 780, the noise ceases. Additionally, if I click and hold on the Sound Card Pane, the noise also ceases. I assume this is because that action arrests HRD's polling of the K3.
I hear it on transmit and I know it is going out with my signal because I've tuned my TH-F6A to the transmit frequency and gone out on the deck and heard it in the TH-F6A's receiver. I assume the noise is coming in on my various antennas because pulling the antenna jack causes the noise to cease. Pulling the audio cables does nothing. I hear the noise on the K3's RX on some bands but not on others. Where I really hear it is on the TX monitor when the Line in is set high and the computer's sound card is set low. If I try the reverse - set the Line In to 2 and the sound card on the computer to 100, I can barely hear the noise. That has been my workaround when on PSK lately but I would like to eliminate this noise altogether and keep my signal clean. Interestingly this doesn't show up as distortion on my external IMD meter from KK7UQ. I guess the noise is too wide and not a distortion product. I'm thinking a ferrite toroid on the antenna coax might solve this. I tried one of those clip on ferrite dealies with no joy. So the question is: does anybody on the list have any experience like this? Is a toroid a good idea? Which one and how many turns? TIA 73 de Eric, KG6MZS ______________________________________________________________ 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
