[TenTec] Purpose of 250 Hz 8 pole filters

[k8vf_mark at centurytel.net]

If you ever work on a very noisy band looking for weak signals, you'll find 
the 250's-even stacked-help quite a bit.

Also, on most cw contests, the narrow filter really makes a difference in 
blocking out the "neighbors".

Trying to work a station with 3 guys in the 500 Hz passband, is 
futile....but SOMETIMES, the 250 solves the problem.

Dont forget to touch up the PBT as it MAY be different than the 500Hz model.

K8VF