|[AMRadio] RE: MODULATION POWER REQUIRED|
macklinbob at msn.com
Fri Feb 15 09:04:51 EST 2008
I understand the modern RICEBOXES had speech processing the clips peaks and
filters the audio.
I had a tube speech processor back in the 60's. It was a classic
clipper/filter. It worked very well. For a lower power transmitter like the
smaller Heath DX units you can increase the voice level clipping and
filtering there by generating a higher modulation index without over
modulating. And if properly set you won't exceed the legal limits.
I am going to build another one for my current DX-60.
"Real Radios Glow in the Dark"
----- Original Message -----
From: "D. Chester" <k4kyv at charter.net>
To: <amradio at mailman.qth.net>
Sent: Friday, February 15, 2008 1:46 AM
Subject: [AMRadio] RE: MODULATION POWER REQUIRED
> Most of us stay somewhere within the ballpark of the so-called "legal
> limit", and worrying about an occasional voice peak that might jump a
> over, every now and again for a milliseconds or two during the course of
> entire old-buzzard transmission, is MUCH ADO ABOUT NOTHING. Is everyone
> that picky and consientious in regard to exceeding the posted speed limit
> when we drive, something that can actually put our own or someone else's
> life in danger?
> We need to be more concerned about overmodulation, flat-topping and other
> improper conditions that generate spurious distortion products and do
> harm on the bands by causing unnecessary splatter and interference beyond
> the limits of our normal channel width. (Not the same thing as the higher
> frequency audio components that occur naturally in our voice signals.)
> Don k4kyv
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