[Elecraft] adding 250Hz filer, any improvement?

[Robert Bajuk]

I found 8 pole 400 Hz and 5 pole 200 Hz as a great combination in last CQ 160m. 400 Hz filter was to wide most of the time. 

73 Robert, S57AW

Sent from iPhone

Na dan 9. feb. 2011, ob 02:30, Wayne Burdick <n6kr at elecraft.com> je zapisal:

> On the other end of the spectrum: If the going is really tough, you  
> might consider our 200 Hz, 5-pole filter. It's a favorite of CW and  
> data-mode operators who routinely have to dig for weak ones between  
> monster signals in CW and data modes.
> 
> 73,
> Wayne
> N6KR
> 
> On Feb 8, 2011, at 11:07 AM, Scott Ellington wrote:
> 
>> QRM levels are generally much lower outside EU or NA.  Years ago, I  
>> did a CW contest from ZL with a TS-50 and a single 500 Hz filter.   
>> That would have been woefully inadequate in NA, but it was fine  
>> there.  So, the question I would ask is whether anyone in a non-EU  
>> or NA QTH has compared the K3 400 Hz filter with narrower DSP with  
>> the 250 Hz filter.  Surely, the 400 Hz fliter +DSP would be far  
>> superior to that old TS-50, so I would expect it to be fine.  Note  
>> that the K3 "250 Hz" filter is really about 370 Hz wide, compared to  
>> 435 for the "400 Hz" one, so the difference isn't that great, anyway.
>> 
>> Perhaps Jorge can check this out in the next contest:  Set the "I"  
>> filter to 400 Hz, and the "II" filter to 250 Hz, both with the 400  
>> Hz xtal filter. I'd be interested in the results.
>> 
>> 73,
>> 
>> Scott  K9MA
>> 
>> 
>> 
>> On Feb 8, 2011, at 11:49 AM, Jorge Diez - CX6VM wrote:
>> 
>>> Hello,
>>> 
>>> 
>>> 
>>> I have both KFL3A-400 (400 Hz 8-pole) and KFL3A-1.8K  (1.8 kHz 8- 
>>> pole)
>>> filters in my K3.
>>> 
>>> 
>>> 
>>> If I add a KFL3A-250 (250 Hz 8-pole) filter I will notice it better  
>>> to use
>>> in contests?  Or with the 400Hz is enough?  Notice I am not in USA  
>>> or EU
>>> with strong stations near me, I don´t have the QRM this big  
>>> populations
>>> have, trying to reduce the splatters.
>>> 
>>> 
>>> 
>>> 73,
>>> 
>>> Jorge
>>> 
>>> CX6VM/CW5W
>>> 
>>> k3 #4077
>> 
>> Scott Ellington
>> Madison, Wisconsin
>> USA
>> 
>> 
>> 
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