K2 DSP & SSB

[RobertG]

Hello all...

Ser# 5957: DSP works fine on CW; use it all the time. On SSB, more iffy.
Signals sound very watery, to the point of being hard to copy, even
allowing for the noise reduction. Are there adjustments for DSP/SSB that I
can tinker with to clear this up? Thanks much.

...robert


Robert G. Strickland PhD ABPH - KE2WY
[hidden email]
Syracuse, New York  USA

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[KK7P]

> ...Are there adjustments for DSP/SSB that
> I can tinker with to clear this up? Thanks much.

Yes, set Beta and Decay each to 00 and listen to the effect.  Cycle the
denoiser through all 4 levels((see page 25). Next, set Beta to 99 (just
decrease the setting by one and it will wrap around to 99).  Listen
again to all four settings. This will give you a good feeling for the
effect of this parameter.  Next, change Decay to 99, and listen.
Finally, change Beta back to 00 with Decay still at 99.

Now you will have an idea what each parameter does to the "wateriness"
as well as the amount of denoise, and how much it is affected by the
demoiser level.  You can then adjust Beta, Decay and Level until you get
the best compromise between denoising and the artifacts that result from
the denoise operation.

In general, if a signal is strong, you'll just turn the denoiser off. If
it is really in the noise, you probably can't recover it. If it is
marginal, the denoiser comes into its own.

73,

Lyle kK7P

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[RobertG]

Lyle...

Thanks for your reply. Are these adjustments, when finalized for SSB,
retained through on/off and mode cycling? Take care.

...robert

At 08/06/2007 15:34, Lyle Johnson wrote:

>>...Are there adjustments for DSP/SSB that I can tinker with to clear this
>>up? Thanks much.
>
>Yes, set Beta and Decay each to 00 and listen to the effect.  Cycle the
>denoiser through all 4 levels((see page 25). Next, set Beta to 99 (just
>decrease the setting by one and it will wrap around to 99).  Listen again
>to all four settings. This will give you a good feeling for the effect of
>this parameter.  Next, change Decay to 99, and listen. Finally, change
>Beta back to 00 with Decay still at 99.
>
>Now you will have an idea what each parameter does to the "wateriness" as
>well as the amount of denoise, and how much it is affected by the demoiser
>level.  You can then adjust Beta, Decay and Level until you get the best
>compromise between denoising and the artifacts that result from the
>denoise operation.
>
>In general, if a signal is strong, you'll just turn the denoiser off. If
>it is really in the noise, you probably can't recover it. If it is
>marginal, the denoiser comes into its own.
>
>73,
>
>Lyle kK7P

Robert G. Strickland PhD ABPH - KE2WY
[hidden email]
Syracuse, New York  USA

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[KK7P]

> ...Are these adjustments, when finalized for SSB,
> retained through on/off and mode cycling?

Yes, all settings (except putting the unit in "bypass" mode) are
"sticky" and are saved through power cycles.

73,

Lyle KK7P


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