Mathew, Not sure if your problem is with the rx or tx. 15k might be bit high and could lower for driving most controllers, but probably not a problem.
On the exec IIs in the mobile version on the SAS board tx audio input is a 600 Ohm resistor to the 10 volts for biasing a microphone. This offers a 600 Ohm load to the controller driving the tx. If you remove it this will provide a much higher input impedance. Only a few hundred mV is required to drive an exec IIs tx to full 5 kHz dev. I drive them with the resistor removed, but do add a 2.2 k in series. I hope you do not have a bad tx audio IC, custom made for GE. Easier to replace the exciter. 73, ron, n9ee/r --- In [email protected], "n9lv" <[EMAIL PROTECTED]> wrote: > > I have taken a UHF transmitter and combined it with a VHF receiver for > a crossband split. The very maximum deviation that I can obtain from > the radio is about 1.5 KHz. This is with the pot turn all the way > up. Mic high is being fed into a 1.0 MFD cap through a 15K resistor > to the high side of the volume control. The audio is clear, just not > all that loud. > > Mathew >
