[TenTec] Purpose of 250 Hz 8 pole filters

[Ken Brown]

>   Another viewpoint:  I have both filters (500 and 250) in my Corsair 
> II, and found that I never used the 250.  Too narrow for comfortable 
> tuning, and if I couldn't isolate a signal in the 500 hz bandpass it 
> wasn't worth the aggravation anyway.
>   
>   
This is sort of my experience too. I do use the model 221 six pole 250 
Hz filter in the 9 MHz IF a lot. However the  model 282 in the 6.3 MHz 
IF never gets used . Using the 250 Hz  8 pole filter "interferes" with, 
or detracts from, my own ability to discriminate between
noise and CW signals. I found I was also not using the 250 Hz filter in 
a FT-1000 this weekend for the same reason. It seems like the main 
purpose of a 250 Hz 8 pole filter is to use it to demonstrate that you 
don't really need a filter narrower than 500 Hz. This is for human 
copied CW, there may be practical application of the 250 Hz filter for 
other modes.

DE N6KB