On 2/25/2014 2:02 PM, Bob McGraw - K4TAX wrote:
I can agree with Jim on this.
Proper use of compression {emphasis on "proper} does raise the
average audio level. Excessive compression can cause a "pumping" sound.
Yes. In general, audible pumping is most often caused by bass content,
which is another reason for rolling off the low end of TX audio in ham
systems.
Compression with incorrect attack and release times, largely defined
by the program content, can also make things better or worse.
Compressors with automatic variable ratio attack and release times
plus variable input to output ratios do a really nice job to hold the
audio level up and do not artificially color the sound. The
Teltronics LA-2A is a good example. Also the CBS Labs VolumeMax is
another good one.
That's some pretty old iron, Bob. :) TX compression is done quite well
in the Elecraft K3 and KX3, and I suspect Ten Tec stuff of recent
vintage performs well. Although Al Kahn was a CW guy, he was one of the
two founding partners of Electro Voice, and started Ten Tec with the
proceeds from selling EV.
73, Jim K9YC
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