On Wed, 11 Jul 2007 05:54:19 -0700, Telstar Electronics
wrote in
. com:

On Jul 10, 5:47 pm, Frank Gilliland
wrote:
It's really pretty redundant, since almost every radio built since the
1960's has had some form of AGC in the mic line. If he were to use the
noise gate to trigger a keyer relay, use the processor to increase the
peak-to-average level to 40 or 50%, then put it in a box and not lie
about the specs, he could easily sell them for SSB rigs of all types,
ham included. But alas, as you stated befo

Frank... I think you're a little confused... cause you appear to be
using limiter and AGC interchangably. Most radios you speak of use a
limiting circuit... not an AGC. There is a huge difference. A typical
limiter circuit in these radios doesn't have nearly the compression of
AGC/limiter combination. That is because the limiter circuit in these
radios has no absolutely no gain... and can only attenuate the audio
signal on large peaks. That equates to very low compression. The
VoiceMax AGC has about 60dB of gain possible. This accounts for the
very high 15:1 compression ratio. Welcome to the real world.


In the "real world", stock radios do indeed have AGC. I've mentioned
that many times before, it's been stated in this group many times
since I've been here, and the alignment of mic AGC was even a topic of
"discussion" with Dave the Hypocrite. I would think by now you would
have read a few service manuals but obviously not. Yes, they do have
limiters. Sometimes the limiting is done by the AGC (sharp elbow), and
sometimes it is a seperate circuit. But they all have mic AGC, usually
serving double duty as receive audio AGC. I'm not going to scan my
library to prove it to you -- manuals are available on ebay for pocket
change. A lot of people in the group already have a few and know I'm
right. Get some of your own and read them. THEN you can tell me about
the "real world".