I have 2 Heil Prosets, the Elecraft version and the ICOM/Yaesu /5 version. Later today I'll check them side by side for comparison on the K3. I can make both work equally well on the K-2 using the UN-PCB Universal Mic Interface to switch the bias in or out. I use the Heil/Elecraft Proset mono(mic) and stereo(headphones) 3.5mm jacks on back and I can switch the speaker in or out at will with or without the headset turned on. Al WA6VNN
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