Looking ahead to Field Day - roofing filter question

[Julius Fazekas n2wn]

Bill,

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.

The 500 Hz filter is a good choice for general contesting and semi-crowded conditions. For casual CW, you probably don't even need a special CW filter with the K3.

The beauty of the uber-narrow filters in excessively crowded bands is that you can really kill most of the garbage outside of your filter's pass band.

I think it's been stated here before, unless you have serious needs, like contesting, the K3 does great bare bones and added roofing filters are not necessary.

I'll be hauling my K2 out for FD, love the "all-in-one" QRP package.

73,
Julius

Julius Fazekas
N2WN

Tennessee Contest Group
TnQP http://www.tnqp.org/

Elecraft K2/100 #4455
Elecraft K3/100 #366
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[Bill W4ZV]

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

[Buck - k4ia]

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,  
[hidden email] 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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