[Elecraft] audio cut-out problem

[k6rb at baymoon.com]

Last night I was setting up for ARRL 160 and had the K3 in full QSK mode.
During a QSO I had I noticed during TX a randomly occuring crackling noise
followed by a one second or so muting of the monitor audio. In semi-QSK
the problem disappeared. Is this due to a too-short delay setting? I've
never had this happen on any other band using full QSK. I was not using
the RX antenna; I was using the same antenna for TX/RX. Any clues?

Rob K6RB