[Elecraft] Analysis of FT-1000 APF

[Bill W4ZV]

Al Lorona wrote:
>  
> I assumed that the front panel control was a 1k potentiometer. Probably a
> reasonable guess.
> 

Al, I found an online FT-1000 Service Manual and confirm that the APF pot
(VR8901-2) is indeed 1k.  Good guess!

KC7OTG:
>   I'd rather see a menu setting in menu probably even rather than config
    that allows one to set the focus BW and then use the width knob to set
    the width of the wider skirts.  I think that also being able to set the
    depth of the step between the two filters would also be really nice.

Unfortunately that also makes it more complex which lessens the probabliity
of it happening.  If Elecraft *only* wanted to emulate the FT-1000 APF
characteristic, they should narrow the 150 Hz focus of DUAL PB to whatever
is practical (hopefully 30 Hz).  The width of the -20 dB pedestal is already
determined by the WIDTH setting in the present implementation (with the
restriction that 600 Hz is the minimum).  I tried the existing DUAL PB for
awhile, found it contributed little to better CW copy and now it's one of
several unused functions for me.  I don't operate RTTY where the present
dual peak filter is probably quite useful.  

73,  Bill
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