[Elecraft] K3 Distorted Audio On Transmit

[dave_w0ru]

I have a K3, P3 and KPA500. Last night I was encountering some high SWR. The
K3 has the KAT3 internal 100 watt antenna tuner. I do not have the KAT500
tuner. If the SWR was too high, the KPA500 indicated a fault and I went back
to 100 watts with the K3. I tried bypassing the KAT3 to see how the SWR
looked. The K3 started producing extremely distorted audio when I
transmitted (I was listening with my headphones). The audio sounds like a
loud roar. This only occurred on 20 and 30 meters at about 50-100 watts
output using upper sideband (yes, I know we can't legally use USB on 30
meters, I just briefly keyed the PTT). The other bands were fine. Today I
found the problem does not happen when I use a dummy load. The K3 schematic
shows`there is a low-pass filter for 20/30 meters. I am just trying to
figure out if the high SWR caused damage.

73,
Dave W0RU



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