[Elecraft] K3S High Current in 6 metre mode

I have just tried 6 metre USB operation for the first time on my K3S and I notice that as soon as I key the transceiver (without speaking into the microphone), the transceiver draws a quiescent current of 18 Amps with a power meter indication of zero. When I speak into the microphone, the curren

[Elecraft] K3S relay noise when using Rx ANT IN port

My K3S is configured to use the RX ANT IN port for a separate Rx antenna. However, on SSB transmissions I can hear an internal relay operating in synchronism with peaks in transmit power.  I assume this is a relay in the receiver input protection circuit? Is operation of the relay in this manner

[Elecraft] KPA100 Acoustic Noise

When my K2/100 is keyed in SSB mode (connected to a dummy load) and the microphone is gently tapped, I can hear a faint noise coming from somewhere on the KPA100 printed circuit board. It is a low level buzzing/rattling noise similar to a small metal object vibrating against a loudspeaker cone b

[Elecraft] KPA 100 Resistance Checks

I thought the following observations may be of help to anyone having difficulty achieving the KPA 100 resistance measurements on page 44 of Rev H of the KPA 100 manual. I initially performed the checks using a DMM with the PCB illuminated by a 40 Watt bench light a few inches away. Resistance va