[Elecraft] K3 Filter Option Questions (revisited yet again)

[Duncan Carter]

Currently I have the 8 pole 2.8 KHz filter and the 250 Hertz cw filter.  
One of my friends, W5XZ, who is considering buying a K3 asked me about 
filter choices and especially whether a narrow cw filter.  My reply was 
the "It depends".  Do you want to work near strong local signals without 
blocking?  I f so, then you need a narrow crystal filter for cw.  I 
chose the 250 Hz filter and I'm happy that I did as I can work very 
close, like within 200 Hz to strong locals like K0RF and, in Chuck's 
case, even blank his key ( Yaesu?) clicks at the same time.  I'm 
debating about getting the 400 Hz cw filter or the 500 Hz version from 
Inrad.  Some of my operation is on relatively empty bands like 17 meters 
right now and I use the SCAN feature on cw; 250 Hertz or less seems too 
narrow for this most of the time unless the scan rate is really slow 
using the 1 Hz frequency increment but 400 to 500 Hz is a wide as I ever 
use for that.  For my purposes, I see no need for a 1 KHz cw filter but 
I think this depends, to a considerable degree, on the strength of other 
in-band signals and how close your ham neighbors are.  I don't work much 
ssb and so far, my neighborhood big signals all use the opposite 
polarization but this my change.

Dunc, W5DC

Phil Hystad wrote:
> One of the things that I have not yet decided is the filters to get for my K3 order.  I am firm on getting the 400 Hz 8-pole filter (80 percent or so CW ops).  But, I like to scan the band looking for signals with a wider filter, say around 1 to 1.2 KHz.  Do I need to get the 1 K filter.  If I remember right, I can set DSP filtering to about 1 KHz which may be good enough or is there an advantage to the 1 KHz filter.
>
> Also, is there a good reason to swap out the 5-pole 2.7 kHz filter for the 2.8 KHz 8-pole?  I presume this gives the filter sharper skirts so you can cut off those close stations a bit better but I am curious as to how much better.
>
> Since the dollar cost differences in decisions regarding filters is not that great I would prefer answers that ignore the cost issue.
>
> So far, I am planning on getting the following filters with a ? on the 1 KHz 8-pole and 2.8 KHz 8-pole:
>
> 400 KHz 8-pole
> 1 KHz 8-pole  ??
> 2.8 KHz 8-pole swap for 2.7 KHz 5-pole ??
> 6.0 KHz 8-pole
>
> 73,
> phil, K7PEH
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>