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Not that it matters for this question, but I have an RV-8A that I bought a little more than a year ago, constructed by a reputable builder and with avionics installed professionally.
About two weeks ago, keying the radio for transmission with the switch on the grip caused the AP to disengage and reboot. Further, I noticed that the manifold pressure increase 10# during transmission, dropping back down to the correct pressure when I released the mic key.
There is no static in the radio at any time, including during transmission.
I was on a trip and determined to get back to home base and did so, but an additional symptom occurred - now when I key the mic the ammeter goes to -20.
I do not know the make of the grip, but it has switches for the mic, AP disengage and trim (although no problems when I trim the aircraft). The logical place to start the search seems to me to be in the grip - looking for a frayed wire. My bet is that I have something going to ground when I trip the mic hence the ammeter reading.
Anyone have any similar experience or advice?
About two weeks ago, keying the radio for transmission with the switch on the grip caused the AP to disengage and reboot. Further, I noticed that the manifold pressure increase 10# during transmission, dropping back down to the correct pressure when I released the mic key.
There is no static in the radio at any time, including during transmission.
I was on a trip and determined to get back to home base and did so, but an additional symptom occurred - now when I key the mic the ammeter goes to -20.
I do not know the make of the grip, but it has switches for the mic, AP disengage and trim (although no problems when I trim the aircraft). The logical place to start the search seems to me to be in the grip - looking for a frayed wire. My bet is that I have something going to ground when I trip the mic hence the ammeter reading.
Anyone have any similar experience or advice?