[Elecraft] KFL3A-1.0K filter for voice???

[Ed Muns]

First of all, the crystal filter has nothing to do with trying different
bandwidths.  The DSP provides complete flexibility, including 1 kHz with the
stock 2.7 kHz crystal roofing filter.  But, yes, I've operated at a 1 kHz RX
bandwidth on SSB, 400-1400 Hz.  The intelligibility was much better than I
expected, but I prefer 1.5 kHz (300-1800 Hz).  If you actually use the
KFL3A-1.0K crystal filter with a 1 kHz DSP bandwidth, the cascade will be
less, maybe 900 Hz or so.  As I recall, the KFL3A-1.0K is actually about 1.1
kHz at the -6 dB points, so it won't reduce a 1 kHz DSP bandwidth too much
lower than about 900 Hz.
 
For bandwidths that you use a lot, a crystal roofing filter slightly wider
will provide maximum protection of the DSP from nearby strong signals.  For
example, if you operate SSB in heavy QRM a lot, e.g., contests, you might
like a 1.6 kHz DSP bandwidth with the KFL3A-1.8K crystal filter.
 
Ed - W0YK


  _____  

From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of JD
Sent: Friday, 28 November, 2008 19:10
To: Elecraft at mailman.qth.net
Subject: [Elecraft] KFL3A-1.0K filter for voice???



Hello,

Has anyone tried using the KFL3A-1.0K  1 kHz filter in situations of
extremely

close in stations? I realize the audio would be harsh but is it readable?

Is it a viable filter for extreme conditions?

 

Thanks,

Jeff, N0OST

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