[Elecraft] ESSB Equalization

[Alan Bloom]

I use ESSB but with the equalizer set to limit the bandwidth to about 
2.5 kHz.  I do that because I believe you get better audio quality.

Much of the "Donald Duck" quality of SSB is due to the ripple in the 
phase response of the crystal filter, which occurs primarily at the 
edges of the filter passband.  ESSB in the K3 uses the 6 kHz AM filter 
so the passband edges are well away from the 2.5 kHz voice band.  It 
should have much flatter phase response.

I should do some double-blind A/B testing to compare ESSB versus 
non-ESSB and see for sure if it really makes a difference.

Alan N1AL


On 1/27/2013 9:07 PM, Don Wilhelm wrote:
> IMHO, those who want "studio quality" SSB should obtain a commercial
> broadcasting license and use that instead of using the ham bands for
> "wideband SSB".  Not only is it wasted bandwidth, but it is QRM to
> adjacent stations.  My opinion of AM on the ham bands is similar.
> Technology has advanced to the point where minimum bandwidth to achieve
> effective communications is all that should be used, and an audio
> bandwidth of 300 to 2600 Hz is more than adequate for good communications.
>
> 73,
> Don W3FPR
>
> On 1/27/2013 11:47 PM, Richard Fjeld wrote:
>> I have watched ESSB signals on the P3 and I have this question;  most
>> receivers are limited to as narrow as 2.1 KHz, commonly 2.8 KHz on
>> SSB.  That is about all they are going to hear when listening to a
>> wide ESSB signal.  Unless someone with ESSB is in qso with a station
>> of the same width, isn't it going to be wasted bandwidth?
>>
>> Rich, n0ce
>>    ----- Original Message -----
>>    From: Matt Zilmer
>>    To: Mike Markowski
>>    Cc: elecraft at mailman.qth.net
>>    Sent: Saturday, January 26, 2013 8:08 PM
>>    Subject: Re: [Elecraft] ESSB Equalization
>>
>>
>>    It works quite well too!  Looks like Wide SSB TX and plain SSB TX are
>>    always left with the same profile.
>>
>>    73,
>>    matt W6NIA
>>
>
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