[Elecraft] [K3] Roofing filters are misunderstood

[Fred Jensen]

I too think roofing filters are really not well understood.  For the 
record, I have the stock SSB [2.7 KHz? I don't actually know] and the 
500 Hz CW.  In 99% of my operating situations, it doesn't matter which 
one I use, I set the received BW with the DSP, and I'm a very happy ham.

I do have several close HP contesters, WX6V is one.  On CW if I were to 
use the 2.7 roofer, even with a 250 Hz DSP, Jim will desense my K3 -- 
like maybe 1.5 miles as the electromagnetic waves travel.  The roofer 
makes a difference with strong close in signals.  Whether or not you 
want a 1.8, 2.7, 5-pole, 8-pole, or whatever may be trying to pick fly 
poop out of the pepper for most of us.  If you run a lot of CW in 
crowded conditions, a more CW-ish filter is likely good for you.

My neighbor Jim got a K3 early this year, replacing an ICOM<something>. 
  Still just as strong on frequency, all of the phase noise has 
disappeared, no clicks -- nothing.  Yet again, I'm a happy ham.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2014 Cal QSO Party 4-5 Oct 2014
- www.cqp.org

On 5/11/2014 7:02 PM, David Gilbert wrote:
>
> I completely agree with all of that except for the very last sentence.
> Clearly you've never used a 756Pro (first version) in a major CW
> contest.  I can remember very loud stations 10 or 15 KHz away completely
> desensing my receiver to the point that the station I was trying to copy
> simply disappeared.  When I switched to the K3 the difference was
> astounding.