When initially transmitting on SSB there is a very short noise burst. Seems the tx audio buffer is active on rx and contents are being transmitted on initial transmit. This is most prevelant with stations that have mics that pick up background noise (amps, fans, etc)
Maybe easiest way to get rid of it is to have the tx audio buffer flushed on rx to tx transition?
By adjusting mic gain, compression, and external eq equipment you can reduce mic sensitivity to where it is neglible but the problem still exists. Tx audio buffer needs to be flushed on rx to tx transition.
This has been ongoing for many releases now. It was offically stated that it would be addressed in an earlier release, but immediately reported by users that in fact it still occurs after said release. Prior inquiries to the issue (above) have NOT been answered.