[Elecraft] need some roofing filter advice?

[Bill W4ZV]

Ed Muns, W0YK wrote:
> 
> The K3 is entirely different.  I've been operating SSB with a 1.5 kHz
> bandwidth for three years now and it is perfectly intelligible.  On prior
> radios, though, I couldn't even get a 2.1 kHz filter to sound intelligible
> enough to be useful.  I think the difference is where the filter is
> located
> relative to the signal. 
> 

The K3 is not actually different or it would be violating the laws of
physics.  To make ANY radio work using narrow bandwidths on SSB is simply a
matter of optimizing the placement of the filter passband in the voice
spectrum (as Ed states above).  The FT-1000MP, K2, Orion and many others can
be made to work with narrow filters.  I first discovered this on an MP I
used in the late 90s:

http://www.va3cr.net/va3cr2.net/markv/Troubleshooting/Filters.htm

73,  Bill

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