Skipp, right, you do get audio compression by "hitting" the limiter in the transmitter harder. I've done that several times myself on repeaters. It does give a nice boost to the user's audio, but it increases audio background noise by the same amount. I've A/Bd input audio vs. output audio numerous times and the output audio always has more wind noise, other people talking, RF noise, etc., than the input does. Essentially, this is a very fast release compressor.
This is why I always recommend SLOW release compression, more properly called AGC or ALC. Several seconds release time for sure. It sounds much better than hitting the transmitter limiter harder, and accomplishes the same goal. Laryn K8TVZ --- In Repeater-Builder@yahoogroups.com, "skipp025" <skipp...@...> wrote: > > > Jim Brown <w5zit@> wrote: > > One way might be to set the transmitter deviation to 5 kHz > > for a 2.5 kHz deviation input signal. Set the VOX threshold > > to trip at about 3 kHz input deviation and use it to > > switch in a 6 dBV pad to cut the deviation back down. A > > fast attack VOX with a slow release would keep the audio > > from pumping up and down. > > 73 - Jim W5ZIT > > You'd get compression/limiting just using the example above > without any type of Vox Control Circuit. If the input versus > output audio (deviation) values are properly thought out > the original circuit without any extra circuit hardware is > all you'd really need. No need to complicate things... > > cheers, > s. >
