[Elecraft] K2 filters charactoristics

Sat May 22 17:24:00 EDT 2004

Right, Bill!. I keep forgetting: Never do sums in my head before coffee in
the morning.... 

Ron AC7AC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bill Tippett
Sent: Saturday, May 22, 2004 3:44 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] K2 filters charactoristics

AC7AC wrote:
 >But, if you centered the 700 beat frequency in a 2,000 Hz filter bandpass,
the passband would go from a high frequency of 1700 Hz on the high end, and
then you'd go clear through zero beat to 700 Hz on the wrong sideband!  That
is, a 700 Hz signal would appear twice on your tuning - 700 Hz on either
side of zero beat!

         Right idea but wrong numbers.  The 6 dB passband would go from 
1700 Hz on
the high end to 300 Hz on the other sideband (1700 - 2000 = -300).  But you
would probably still hear 700 Hz on the wrong sideband because the K2's
filter shape factor is fairly broad.

                                         73,  Bill  W4ZV

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