It was my intent to order a K3 when they were
available from stock. Looking at the demand/supply
curve, it would seem I will be long dead and buried
before that will happen so I'm now looking very
closely at those attributes which directly affect the
usability of the radio in my particular environment.
The roofing filter plots I see published have poor
resolution and it's not possible to determine the
passband ripple from them. I think this has been
addressed on the list in the past, but I don't
remember any better data being mentioned. If there is
better passband data can someone point me to it?
I'm concerned because in the past when I've
characterized INRAD crystal filters, they have had
very poor passband response resulting in degraded weak
signal performance. In their defense, I have not had
the opportunity to look at any recent production
filters so maybe it's not an issue anymore.
Lacking any better data it appears to me the best
roofing filter option for very weak signal CW and data
modes is the standard 5 pole 2.7 kHz filter.
Thanks.
Larry - W7IUV
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