[Elecraft] K3 SSB - Is the 5 pole filter good enough

[John A. McCabe]

Wow, that is dramatically different then what I am getting. Here is the 
response I am getting using a bandwidth setting of 0 to 6000:

http://mysite.verizon.net/respk8uz/k3/id1.html

I am open to any suggestions, I have tried changing FL FRQ and 
re-calibrating the synthesizer.

73,

John, KD8K



Barry N1EU wrote:
> My SpectraPlus plots are viewable at
> http://www.n1eu.com/images/K3_2700usb_lsb.gif  
>
> LSB is the acqua trace and USB yellow
>
> As you can see, they're very close and both fairly flat in the passband.  RX
> EQ was zeroed for the measurements and config menu FL FRQ setting was
> adjusted for best match between the modes.
>
> 73,
> Barry N1EU
>
>
> John A. McCabe wrote:
>   
>>  >On USB the trace was substantially flat with the -3dB points at 430Hz 
>> and 2.77KHz. Not too bad >and could probably be improved by moving the 
>> carrier offset frequency.
>>  >On LSB, however the trace was far from flat having a slope from audio 
>> LF to HF of about 6dB. >Not very good at all...
>>  >I wonder if others have plotted their 5 pole filters.
>>
>> Stewart,
>>
>> I just ran a similar test using spectrogram and it confirms what I 
>> thought I heard with my ears and was similar to the results you got. It 
>> was basically flat on USB but was sloped about the same amount on LSB.
>>
>>
>>     
>
>