cannot xmit when intercomm is in ICS(all)
The saga continues. I can xmit only in isolate on intercomm. talked to flightcom
they said that if pin 7&8 were swapped that would be the case. If pins are correct then intercomm is bad. I checked those pins and they are correct So I ordered a new intercomm from vans and installed it. Still has the same problem!!!!! Has to be wiring or circuit brd. vans will not give out pinouts and color code.Have reprogramed the radio as vans directed . don't know where to go from here.
How about if we start with you trying to be more specific in detail as to what you are describing.
Example... you say you "can't transmit" with the switch in ICS.
Does that mean the radio doesn't show the Xmit indicator, or just that no one can hear your transmission?
If it means no one can hear you (meaning you are transmitting a carrier only, but when in Isolate you can transmit.... meaning someone with a receiver can hear you, then their probably is a wiring mix up.
Use an ohm meter/continuity tester to verify that when you push and release the pilot PTT switch (switch on the left stick), pin # 7 on the Dsub connector that plugs into the back of the intercom switches between shorted to ground and open. Do the same with the copilot side PTT switch (right stick) while checking pin # 8. If they are not working correctly, see if pushing the opposite PTT switch produces a change on your meter/checker. If all is well, move on to checking the mic jacks.
Check continuity between the
shorter of the two tangs on the pilot mic jack (the one that contacts the ring position on the mic plug), and pin 2 of the intercom Dsub connector.
Do the same with the copilot mic jack and pin # 3 on the Dsub connector.
If your radio is always switching into transmit (and sending out a carrier) when you push a PTT switch, but you can't always be heard, the only likely cause is a wiring problem with either the PTT switches, or the mic jacks.
The checks described above should show you which it is.
(another thought.... in a previous post you said that when transmitting, all anyone could hear was engine noise. Did you have a second head set plugged in when that was happening?)