In general, filters have little to do with sensitivity. On the other
hand, filters do provide selectivity. In crowded band conditions where
one is attempting to dig out a weak signal among stronger signals, the
roofing reduces the likelihood that the stronger signal will impact the
overall AGC, thus diminishing the apparent strength of the weaker signal.
Otherwise, the added roofing filter certainly can't diminish the
receiver performance but may, under certain conditions, enhance receiver
performance.
Conclusion: buy it!
73
Bob, K4TAX
On 1/29/2018 3:20 PM, stan levandowski wrote:
I am going to order another KX3 this week. Probably tomorrow. The
last one I ordered in 2012 did not have the roofing filter option and
I do not THINK I missed it.
I use ONLY CW and I do NOT contest. I like to CASUALLY chase DX and I
play in low stress sprints like NAQCC but mostly I just like to RAG CHEW.
My antenna is an EFHW installed as a "half square" in trees at 30 feet
(MyAntennas 4010).
I have reviewed the Elecraft site notes, and done a fair amount of
Googling and I now am more confused than ever. It seems that the real
value lies in dealing with strong signals, crowded bands and ferocious
contesting conditions.
My bottom line question is this: If I DO NOT get the roofing filter
option will my KX3 receiver be LESS SENSITIVE? The Sherwood report
shows a pre-amp off sensitivity of .9 uv which improves to a very
impressive .09 with the preamp on. Is this somehow related to the
roofing filter?
I am especially concerned because I remember doing an A/B comparison
on a weak signal between my previous KX3 and my 55 year old Drake 2B
and the 2B beat the crap out of the factory built KX3. I can't help
wondering if the roofing filter I didn't buy in 2012 had something to
do with this.
I sure could use a real simple answer: buy it or don't buy it? CW
sensitivity is my ultimate goal because if I can't hear 'em I can't
work 'em.
Thanks and 73,
Stan WB2LQF
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