[Elecraft] K3 - Filter suggestions for new builder

[Fred Jensen]

On 9/25/2012 4:22 PM, Mike Harris wrote:

> 2700Hz and 500Hz in both main and sub RX here.  Nothing else, not felt
> the need, however, an FM filter could be added in one RX one day.

The only reason to agonize over roofing filters is, "How many strong 
stations do you have near you?"  I have the two "stock" filters with my 
K3, no second RX, I have two very strong contesters within 2 KM of me, I 
don't have any problems.  I can get within a KHz or so of either and 
work the station I'm calling.  I don't know if my close neighbors like 
that, but I know them well and they haven't complained. :-)
>
> There have been measurements which show that the 5-pole filters have
> superior group delay characteristics when compared to the 8-pole.

Might be a problem for some digital modes [not CW, the "First Digital 
Mode"], but some of the more esoteric modes could be affected.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012  Weekend after next
- www.cqp.org