Batboard

dear sirs
i will use a gm300 8 channels radio with kpc3 ... the radio go to tx mode when kpc3 transmit data... but the radio transmit only
the carrier without any data.. can anybody help me about this ??
regards...

You probably have the PTT hooked and not Mic Audio. You'll need both of them in order for the Data to be transmitted. You should have at least 4 connections from the TNC to the radio. Audio+(output), PTT, Mic Audio(Input), Ground.