On Apr 4, 2008, at 12:20 PM, Craig D. Smith wrote:
In my opinion the difficulty in making the choice is because of the
pricing
structure adapted by Elecraft for this option. If the filters were
sold
"ala carte", and you needed to buy the 2.7 or 2.8 in addition to the
K3 (or
sub receiver), I'm guessing that most people, including me, would
elect to
pay $120 for the 2.8 rather than $100 for the 2.7.
=======================
I think that Elecraft wanted to sell a working radio for the base
price. That is the way that I ordered my K3 and it has worked very
well. I am a CW only operator and I would never have considered
ordering any rig without a 500 hz filter, in years gone by. For my
use, since I am not a contest operator and run from pileups, I found
the 2.7 khz filter just fine with the bandwidth set at CW widths. I
have since ordered the 6 khz, 1 khz and 500 hz filters, just
because. Also, the general coverage filter board because I didn't
have a good general coverage receiver. I have read discussions on
other reflectors involving the concept that under heavy QRN
conditions, filters characterized as having steep skirts, with the
resulting sharp shoulders, cause mixing products with the desired
signal, and that the result is unpleasant to listen to when QRM is
not a problem. For the operating I do, especially on the lower
frequencies, QRN is usually the problem. I seldom have to deal with
QRM over S9 and have decided to go with the 5 pole filters where
they are available. But I am also fine with the 8 pole, 1 khz
filter to experiment with. This seems to be my go to filter on CW
these days but I will be comparing both. With a strong interfering
signal close by, I can use the 1 khz filter, with its steeper
skirts, along with shift, to eliminate the QRM. The shift seems to
change the center of the passband in 50 hz steps. I usually have to
fine tune with VFO A after getting close with the shift control.
Not a problem, as I am always working split, since I prefer that to
RIT.
73
Rick Dettinger
K7MW
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