[Elecraft] Looking ahead to Field Day - roofing filter question

[K4IA at aol.com]

I use the 500 hz roofer set to cut in when the  DSP gets around 750 hz.  That 
eliminates a lot of the crud that comes  through.  That crud is the 
"growling" noise you hear in background of the  other rigs when you tighten down their 
DSP.

Buck 
k4ia
k3  #101

In a message dated 2/6/2009 8:38:10 A.M. Eastern Standard Time,  
btippett at alum.mit.edu writes:



Julius Fazekas n2wn wrote:
>  
> In my CW opinion, I would say you don't need a filter for FD use.  While
> popular, it doesn't hold a candle to the harsh conditions during a  160M or
> major DX contest, such as CQ WW on 20M.
> 

Unless  your antennas or operating environment can present signals
approximately  S9+30 to the K3's front end, there is NO need for ANY roofing
filters other  than the stock 2.7k.  Also remember that 2.7k is already about
twice as  narrow as the narrowest roofing filters in the FT-1000 family
*with* Inrad  roofing filters, FT2000, FT9000, IC-7700, IC-7800, etc.  Yes
Icom and  Yaesu claim to have "3k roofing filters" but they have been
actually been  measured at ~5k by Sherwood and others.  Advertising hype
rules at these  companies (as usual).

73,  Bill

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