Deni F5VJC wrote:
I have kept my K2 (1188) up to date with all the A/B mods, however at times
I see references such the one below about T7 where a toroid may have been
changed from the original windings to a revised spec. Are these documented
anywhere, which toroids are now different and why?
Thanks for the many replies, after spending HOURS of tweaking and reading
and retweaking and listening I have a better picture of what my K2 CW
filters are capable of.. There is an interesting dent in each of the curves
that I can not explain.. any ideas?
Worth noting, I found out by accident
Ken Lotts wrote:
The below chart is the best I can produce with the AGC turned off. Bottom
line is that I get about 6 db of attenuation when I switch to the 200 Hz
filter.
I would say this is typical.
But...your widest filter shouldn't be centered on 570 Hz, since this allows
significant
Ken Lotts wrote:
To give you an idea what I am seeing I have posted a spectrogram screen shot
with all three filters superimposed on each other. Does it look typical to
you?
It looks fine, although I would move the two wider filters a bit to the right.
There looks like about 6-8 db
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