[Elecraft] CESSB Duty Cycle

[Joe Subich, W4TV]

> That said, we will be playing with this in DSP code to see if it's
> worth the trouble.

In theory it should be worth the trouble as the distortion (other than
any increased background noise) should be less than typical "hard"
clipping with a non-phase equalized filter (for the K3, that's the
KFL3B-2.7 or KFL3B-2.8).  Put another way, the user should be able to
clip "harder" with less distortion using the CESSB algorithm.

73,

    ... Joe, W4TV


On 1/21/2016 10:39 AM, Wayne Burdick wrote:
> The finals could handle it, just as they handle full-carrier modes
> like RTTY and FM. The bigger problem, specifically described in the
> article, is the power supply. Many operators who use SSB or CW only,
> not full-carrier modes, are using power supplies that are barely
> adequate. They can handle 20+ amps at light duty cycle, but not
> CESSB, etc.
>
> As I mentioned previously, both the K3/K3S and KX3 have excellent
> speech compression already, and the difference between a fairly
> aggressive compression setting and CESSB is, in practice, rarely
> going to make a difference. That said, we will be playing with this
> in DSP code to see if it's worth the trouble.
>
> Wayne N6KR
>
>
>
> On Jan 21, 2016, at 6:56 AM, Bob McGraw K4TAX <rmcgraw at blomand.net>
> wrote:
>
>> The recent article in February QST describing the CESSB mode is of
>> interest.  Just wondering if that mode can or will be added to the
>> code operating the K3S?   Also, wondering if the higher duty cycle
>> of the CESSB mode will exceed the ratings of the PA stage and that
>> of the KPA500?  From what I read it seems that most SSB rated amps,
>> past and present,  may have inadequate ratings for the higher duty
>> cycle.
>>
>> Thoughts?
>>
>> 73 Bob, K4TAX
>
>
>
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