New 3.41 IMPROVED RX LOW-FREQUENCY RESPONSE in AM/SSB/CW MODES

[mark roz]

To me there is no difference between 3.30 and 3.41. Same low freq. response.
However, for my needs it is OK. Yes, I'm adjusting shift and width.
 
There is one problem with the new 3.41- the DSP high pitch noise level is higher (3dB or so) than with 3.30.
Condition: RF gain at 12 o'clock    AF set for normal listening level with good headphones.
Antenna switch is being used to ground the antenna. Listen  to the band noise on 20 or 17m and ground the antenna. Now compare internal DSP noise to band noise by using antenna switch
Do the above with 3.30 and than 3.41. My K3  SN is above 3000.
I like 3.30  and I'm hoping that DSP gain distribution/noise level in future firmware will be the same as in 3.30.
There is also difference in DSP gain between 3.30 and 3.41.   
 
 


     
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[wayne burdick]

Lyle and I will discuss your findings, retest the passband and get  
back to you. However, I'm virtually certain that 3.41 is vastly  
different from 3.30, as others have noted, so this is a mystery.

73,
Wayne
N6KR

On Oct 7, 2009, at 4:14 PM, mark roz wrote:

> To me there is no difference between 3.30 and 3.41. Same low freq.  
> response.
> However, for my needs it is OK. Yes, I'm adjusting shift and width....

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[Alexander Ponomarenko-5]

My K3 feel the difference between 3.30 and 3.41.
Open these plots (LSB/USB-mode) in two different windows:
FW3.41 - http://forum.cqham.ru/download.php?id=49432
FW3.30 - http://forum.cqham.ru/download.php?id=49431
RX-EQ is equal for both plots. Plots for Phone-out.

P.S. But my K3 has been modified:
http://ur5lam.jimdo.com/elecraft-k3-mod-s-page/

73!
Alex UR5LAM

Wayne Burdick:

> Lyle and I will discuss your findings, retest the passband and get  
> back to you. However, I'm virtually certain that 3.41 is vastly  
> different from 3.30, as others have noted, so this is a mystery.
>
> 73,
> Wayne
> N6KR
>
> On Oct 7, 2009, at 4:14 PM, mark roz wrote:
>
>> To me there is no difference between 3.30 and 3.41. Same low freq.  
>> response.
>> However, for my needs it is OK. Yes, I'm adjusting shift and width....

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