Speech Processing Re: [AMRadio] RE: MODULATION POWER REQUIRED


RJ Mattson rjmattson at hvi.net
Fri Feb 15 10:25:46 EST 2008


Bob
Let me know what u decide on. I'm running qrp AM and need every ounce to be 
intelligence.
I can't waste power to be hifi.
Was your ckt similar to the Eico modulator clipper?
I assume you will strictly use tooobes?  :-)

bob...w2ami  x  wn2ami  1962


----- Original Message ----- 
From: "Bob Macklin" <macklinbob at msn.com>
Subject: Re: [AMRadio] RE: MODULATION POWER REQUIRED


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.

Bob Macklin
K5MYJ



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