[Elecraft] PSK mic input question

[Ralph Abbott]

I am attempting to operate PSK31 on my K2.  I am using a BuxCom Rascal interface, with a cable from "external speaker" for audio into the computer, and a cable to the mic input using both the audio in and PTT lines with a common ground.

I am able to receive properly, and the PTT works correctly.  However, the audio input is not working correctly.  There is little or no output from the K2 (as seen on a wattmeter) no matter what the audio input level is from the computer sound card, but if the signal is monitored on another reveiver there is a very noisy, pulsing tone that does NOT change with raising and lowering the audio input level from the computer.

Since I have been using the computer and the interface with other rigs, I believe the fault is not with these parts.  I have also confirmed that the mic connector is wired correctly.

I have set the K2 up to use the Heil Proset headset, which means that I have placed the appropriate resistor between pins 6 and 1 on the front panel mic connector.  My suspicion is that the voltage supplied by that resistor may be causing the problem.  Since I will be using the K2 with the Proset most of the time, I do not wisk to remove the resistor.  Anyone have any experience with this or any suggestions?  Thanks.

73,
Larry  WA3ELQ