I am able to get the mic working just fine but the speaker sounds terrible. It is very low audio and distorted and has a very "underwater" type sound.
Here is a schematic of the mic / wiring I am using and a pin out of the Hirose connector.
The select pin is grounded to allow the radio to know an external accessory is attached to the adapter.
Anyone have a schematic of the NTN8613? I do note that the adapter does NOT use the Speaker(-) connection on the radio (that pin is not even installed on the UDC) so it instead uses the Ground connection as both Mic(-) and Speaker(-). Generally on Motorola radios you aren't supposed to ground the Speaker(-) but there is no alternative here and I saw in another (very old) thread (located here: http://batboard.batlabs.com/viewtopic.p ... 01&start=0)that this seems to be the correct connection.
Anyone have any ideas?