I have 2 K3s: one I built a year or more ago and one I just purchased with a sub receiver built at the factory. On the new unit with the sub, when I transmit there is a tone in the audio. It's pretty constant at about 2.8 kHz, will vary with the mic gain, is audible in the MON output as well as on a separate receiver. It is evident in USB/LSB, Data, AM and FM in the monitor and is present with no mic plugged in. My usual power supply is a 25 amp switching supply, but the issue remains when i switch to a 25 amp linear supply. I can unhook everything from the K3 except for power and antenna with no change.
The K3 that I built does not exhibit this problem hooked in the station the same way--e.g. unplug one from antenna, power, rs232, etc. and drop the other one in with the same connections. Elecraft's thinking was that it's an interaction between the main and sub receiver dsp boards and they sent me a replacement sub receiver dsp board which I have just installed. Problem remains and was not changed--still the same tone. The new unit contains the ATU, sub receiver, digital audio board, and the 100 W option. Anyone come across this problem before? Thanks & 73, Ken, KY5G ______________________________________________________________ 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
