I was transmitting wspr on 40 at 100 mW from a WSPRLite tx, and monitoring on an antennaless K3 in SSB mode (just listening in SP3, not trying to decode). (Background: I have for a while been fascinated with how room accoustics will sometimes, with a given head position, make the tone in cw reception almost disappear). Watching the WSPR signal on the P3 at minimum span, I could see two sideband peaks well separated from the carrier. Tuning slowly I noticed something similar to the cw/room accoustics phenomenon: At a certain tuning point the whistle from the speaker got very quiet. Moving my head around I concluded that this was probably not room accoustics but some kind of characteristic of the wspr modulation. Be that as it may, then came a big surprise, and here is my main issue for the group: Suddenly there was a loud click followed by complete silence, which lasted a second or so. It was like someone had ripped the speaker cable out of the radio. The normal sound then came back, but several seconds later the click and silence came again. This seemed to cycle forever. The picture on the P3 remained steady, so the wspr tx did not interrupt its operation, and the K3 front end kept operating normally. I then tuned around, changed the rx to cw, etc, and the phenomenon went away. Normally I would take time to study further before bothering the group, since many things could cause a break in rx audio, but I have not been able to repeat it. One thought that came to mind was that somehow the K3 dsp got saturated and hickuped, but the received signal was quite weak on a quiet band, only about 20 or 30 dB above noise, and hardware agc should prevent that anyway. While I am waiting for something similar to happen in the future, I am just asking the group if anyone has had a similar experience.
Thanks in advance, 73, Erik K7TV ______________________________________________________________ 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
