Hi Dave, Many transceivers have automatic muting of the microphone whenever the rear panel accessory jack PTT is in use... and they do not require external switching or modification.
However, some Icom transceivers and other brands do not have internal muting of the microphone muting when the rear panel audio/PTT is enabled. A simple modification of the Icom HM-36 microphone results in the muting of the microphone whenever the microphone's PTT button is not being pushed. It enables the computer to interface via the transceiver's rear panel data accessory jack, without ambient audio entering via the hot microphone during computer audio transmissions. CLICK HERE TO VIEW THE MOD: http://hflink.com/icom/microphone/hm36/ This mod provides an easy viable solution that does not require modification of the transceiver itself. The principles used in this modification may be applied to other brands of transceivers and microphones. 73 Bonnie VR2/KQ6XA > Dave KB3MOW wrote: > I'm using the ACC jack on the rear of my IC-746 for > digital mode audio from my computer. Convenient, > but the downside is that the microphone > picks up audio from the room and that also gets > transmitted. > ... might there be a simpler way to kill the > audio from the microphone without going through all this?
