[Elecraft] 700 Hz Filter Benefit

[Fred Jensen]

On 1/22/2014 2:06 PM, Joel Black wrote:
> I'm not bashing the filter, but I'm pretty happy with my 2.7 kHz and 500
> Hz filters (main and sub receiver). What would be the benefit of the 700
> Hz filter?

I have a 2.7 and 500 too and they seem to be all I need.  They're 
roofing filters whose only job is to keep very strong signals adjacent 
to the BW [set by the DSP] that you're listening to from activating the 
HW AGC that protects the ADC.  If you have neighbors who run a lot of 
power, or are physically close, the narrower filter would seem to be 
valuable.  That said, I usually run CW at 200-250Hz DSP BW, RTTY takes a 
minimum of 300Hz, and I can't understand SSB at anything much less than 
1.8KHz.

That's a lot just to say, "I guess I don't know."  Maybe the passband is 
smoother on the 700Hz filter?

73,

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