[Elecraft] CESSB (was Re: Software Update for KX3)

[Bob McGraw]

I strongly agree with Jim, K9YC on this approach.

I'm not sure what exactly CESSB does, although I've read and studied the 
documents, but killing the low end and using an appropriate amount of 
CMP does a great job of pushing the equivalent PEP  to a much higher 
level.  That makes a 100 watt PEP radio sound like a 2000 watt PEP 
radio.   That, my friends, is 13 dB.  My K3S does a wonderful job in 
this regard.  The only thing I use are the features and TX EQ found in 
the radio.

73

Bob, K4TAX

On 7/18/2025 11:00 AM, elecraft-request at mailman.qth.net wrote:
> Message: 3
> Date: Thu, 17 Jul 2025 15:21:01 -0700
> From: Jim Brown<jim at audiosystemsgroup.com>
> To:elecraft at mailman.qth.net
> Subject: [Elecraft] CESSB (was Re:  Software Update for KX3)
> Message-ID:
> 	<28dc4888-2adf-49c1-b91b-580bd670af52 at audiosystemsgroup.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> FWIW, the benefits of CESSB can easily be approached by a combination of
> judicious use of TXEQ to kill the low audio frequencies below about 500
> Hz, and adjustment of COMP for an indicated 10-12 dB of gain reduction
> on voice peaks. That combination provides an increase of "talk power" of
> about 13 dB -- 3 dB for killing that wasted low end that makes no
> contribution to speech intelligibility, and 10 dB for COMP. This is more
> than two S-units, making 5W as effective as 100W!
>
> I've been doing this and recommending it since my first K3 in 2008. Last
> summer, I had a long ragchew of 40M with neighbor W6GJB, who was at his
> cabin in the mountains with his KX3 and a compromise antenna. When we
> started, he was tough to copy, but when I talked him through those
> adjustments, he was armchair copy for nearly an hour until it got later
> and the band went long.
>
> 73, Jim K9YC
-- 
Retirement: It's nice to get out of the rat race, but you have to learn 
to get along with less cheese.