[Elecraft] K3: KRX3 question

[Bill W4ZV]

Joe Subich, W4TV-3 wrote:
> 
> 
> Bill, 
> 
>> David you may be suggesting that "in theory" but I would pay
>> *close attention* to what W0YK says.  Ed wins many RTTY contests 
>> including several current world records from P49X, and results 
>> sometimes speak louder to me than theory (and I'm an engineer 
>> if that means anything).
> 
> Ed and I had an extensive off-line discussion concerning the K3 
> filter options and RTTY.  We both made multiple measurements of 
> the composite bandwidth (roofing filter, DSP and dual passband 
> filter) with several settings.  The consensus is that the 200 Hz 
> DSP settings work as long as the roofing filter is more than 250 
> Hz wide.
> 

That's interesting since there isn't a 250 Hz roofing filter.  There's a 370
Hz and a 224 Hz, but no 250 Hz.  What did you use for the 250 measurement
above or is that a calculated result?  At any rate, I'll defer to Ed since
he's forgotten more about RTTY than I'll ever know, as his contest results
demonstrate.  ;-)

73,  Bill


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