On Tue, 10 Jul 2007 04:21:39 -0700, Telspam Electronics
wrote in
. com:

Beisdes increasing modulation percentage from 85% to 100% gains little
in range or intelligability. Often not worth the effort. Adds about 7%
audio power into the each of the two sidebands. Even if the limiter
section of the modulator section is not disabled adding your
compressor is not going to increase the percentage of modulation. So
why waste the money to buy and install it unless you disable the
radio's internal limiter?

The original radio has the capability of getting to 85% modulation.


Unless it's an old tube-type radio, your original radio was broke.
Just about every solid-state radio built since the 1960's has the
modulation set for 95-98%. I mentioned this before, but like every
other fact I have stated that is easily verifiable, you ignored it.


This 85% is by no means the average modulation... which is really
around 40% with voice signals.


It varies as much as people have different voices and speaking styles,
but it is generally accepted to be in the 20 to 25% range (peak to
average ratio from 5:1 to 4:1).


The VoiceMax brings the average
modulation to 100%! That means that every voice... high or low... soft
or loud... will modulate the radio at a constant 100%.


Impossible, and you prove it yourself with your implementation of a
noise gate. You can push 40 to 50% with heavy filtering, and that's
about the best you can do, but it still causes moderate distortion.
Even if your "constant 100%" modulation applies only to unmuted voice,
it would be completely unintelligible. You can pick up almost any book
on radio communications and it will say the same thing.


I'm in full
agreement with your last statement... if your leave the radio's
limiter untouched... you will only be able to maintain a constant 85%
modulation. Granted, that is a great improvement from the original
radio modulation... but to get full advantage from VoiceMax (the
VoiceMax installation instructions are quite clear on this point)...
you need to adjust or disable the radio's limiter so you're able to
reach the 100% modualtion point. Once there... the VoiceMax has an on-
board adjustable limiter that will hold you precisely at the 100%
level. You can't do any better than that!


Assuming you set your processor's limiter to 100% mush, you still need
to set the output level to the radio so it doesn't overmodulate. Even
just 101% modulation means clipping; pump that with 100% average noise
and you have the potential for some serious bleedover. And there's no
way for the average user to determine the precise point at which his
radio is at 100% modulation. Radios are set at the factory for 95% to
98% modulation to allow for slight variations in tolerance that happen
during normal operation; for you to claim that your processor limits
modulation to 100% all of the time is not only absurd, it's impossible
because of the tolerance limitations of the radio.


These are the hard questions, Brian. And this is not a rant. I'll even
grant you clemency from your now broken promise not to reply to my
posts. You have no excuse not to reply.