Posted by
Karsten Eppert (DK4AS) on
Apr 26, 2005; 4:21pm
URL: http://elecraft.85.s1.nabble.com/K2-CW-Filter-Response-is-that-ok-tp377646.html
I have set the wide CW-Filter (Fil1) to 1,5 and aligned the BFO to a
pitch of 700 Hz. I applied HF of constant frequency to the
receiver-input with a signal strength that generated S9+10 db max. and
plotted the S-meter versus variation of the VFO from high pitch to low
pitch in 100 hz-steps. So I could determine a filter-curve. What strikes
me is, that even at very low pitch-frequencies there is hardly
attenuation and even at zero beat the S-meter still shows approx. S3.
Turning the VFO "behind" zero-beat lets the S-meter decrease but it
takes another 300 Hz until S0 is reached. The tone of the "wrong"
sideband remains audible at even higher frequencies.
In real amateur life this means, that strong near-by stations close to
zero-beat still affect the AGC considerably.
My question is: is that typical for the cw-filter-design of the k2 or is
something wrong with my device? Do I have any method to check, if
something is dead or badly installed?
By the way: I did the same kind of plot with the Filter of the
SSB-Adapter (OP1). Result: perfect.
Karsten
DK4AS
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