[Elecraft] K4D R29 beta ESSB and CESSB - Rolls off low end TX frequency response when COmp at 1 or higher.

[Morgan Bailey]

ESSB---Folks, if you want to be a broadcaster with high fidelity, then use
AM. SSB is for COMMUNICATION of information and as such making it a
fidelity race will occupy more bandwidth than is necessary to communicate.
The bands are already crowded, Imagine everyone one in a contest with 1500
watts of ESSB with 4KHZ bandwidth. What a waste of available spectrum. As
long as I do not sound like some woke disney donald duck character and have
clear audio at 2.3khz, I am good to go and freely give up the 1.7khz to
another station's bandwidth.

73, Morgan NJ8M

BS + MS + $2.98 = COFFEE
Real Life Experience = Priceless, says the man who set his back yard on
fire with a breadboard tuner loading a 160 meter inverted L with 1000
watts. LOL


On Tue, Apr 5, 2022 at 10:29 PM <rocketnj at gmail.com> wrote:

> Hi All,
>
>
>
> Just received a K4D from a friend. I have it connected and just getting
> used
> to the radio.
>
>
>
> We operate ESSB (4 kHz LSB) on the lower end of 80 meters where there is
> ample room without causing interference. When you rag chew for several
> hours
> it is much more pleasing to listen to.
>
>
>
> I upgraded the radio to R29 beta and set TX to ESSB and TX BW to 4 kHz.
> First thing I noticed is the low frequency rolloff point is fixed and not
> adjustable. The TX bandwidth seems to use the same low frequency cutoff.
>
> Second thing I noticed is the CESSB compressor seems to be programmed in
> both ESSB and normal TX mode as a mid band compressor, boosting the
> midrange, which then makes the audio sound very flat. This happens as soon
> as compression is 1 or higher.
>
>
>
> This is fine for normal SSB TX to add punch and help crack pileups but in
> ESSB mode it should affect the complete TX passband. I guess I have gotten
> used to a couple of other brand SDRs that do use CESSB and don't attenuate
> the lows and highs when engaged.
>
>
>
> I'd like a feature request that the CESSB compression work over the whole
> range of TX audio in ESSB mode and also have the low frequency and high
> frequency cutoffs on TX in ESSB be adjustable, just like the RX filters
> are.
> The CESSB implementation for normal SSB is fine.
>
>
>
> 73
>
> Dave wo2x
>
>
>
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