Hi Mathew, You did not mention where you're picking up the audio from the VHF RX. It should be speaker audio, that has been de-emphed. If you are taking it from the high-side of the squelch pot (VOL-SQ HI), that is discriminator audio, and as it has already been correctly pointed out by others, that is still pre-emhed by the users radio. If you send it along to the TX, it will be pre-emphed again there, making the audio double pre-emphed, and it will sound very tinny.
One other item to think about. Have you measured the audio level at your pick-up point in the RX? It should be at least 2 volts peak-to- peak for maximum system deviation, usually 5 kHz, coming into the VHF RX. That should drive the pants off your TX. However, if you're not getting that kind of audio level, then you're going to have to adjust the audio level pot, inside the discriminator silver box on the RX. It is the edge-mounted pot. Start with a good audio level, and your TX should be able to deviate normally. Hope that helps, Shorty, K6JSI San Diego --- 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 >
