[Elecraft] Q on Setting K3 Filter Offsets

[Grant Youngman]

i guess I'll end up breaking down and do a real SA measurement over  
the weekend to double check  my ears :-)

Grant/NQ5T

On Feb 13, 2009, at 9:09 AM, Don Wilhelm wrote:

> Grant,
>
> The answer depends on how much you can trust your ears to discern  
> pitch - mine are terrible at that task, so I use the spectral  
> analysis software as my 'crutch', but if you have good pitch  
> recognition, your settings may be as good as it gets.
>
> 73,
> Don W3FPR
>
> Grant Youngman wrote:
>> I have all 8-pole filters in my K3.  I've always noticed a slight   
>> audio response difference between LSB and USB positions.  Read  
>> some  list history on the topic.  I do have a wideband noise  
>> generator and  spectral analysis software, but have been too lazy  
>> to get everything  set up.  So I did a quick and dirty, just  
>> equalizing the receive  response aurally on all of the installed  
>> filters.
>>
>> Ended up with  -0.12 on the 2.8, +0.06 on the 1.8 and -0.05 on the  
>> 400.
>>
>> I'm curious wether the experts around here think that's close  
>> enough  for government work, or if it's really worth going the  
>> spectrum  analyzer route.  Could these results just be due to  
>> unequal skirts,  and maybe I should just "don't worry, be happy"  
>> and leave the 8-pole  offsets set to zero?
>>
>> Thanks ... Grant/NQ5T
>>