Thank you again, Don...I also got similar advice seperately from G3VVT
Bob.
I want wider bandwidth for panoramic scanning so I can see the most band
activity for search&pounce -- can't I always tighten it by selecting one
of the narrower filters once I start a QSO?
Based on your advice and Bob's, I may go with 2.2 instead of 2.5. I
definitely don't want to go with what I have which is the "original" in
terms of the CA etc caps...I ordered a bunch from Mouser so I can do
either 2.2 or
2.5. Thanks for all the help.
I really want to get the KSB2 built so I can test the K2 Mojo on the
excellent high band SSB we have had these past few days. This morning
on 15M I heard an OM with a K2 break a pileup to JW7VW on Bear Island
near Svalbard...his call was WA6HHQ...
73,
Leigh.
On Thu, 28 Oct 2004 2:43 pm, W3FPR - Don Wilhelm wrote:
Leigh,
You don't have to order new crystals.
Check the value of C179 in your K2 - if it is 100 pf (and NOT 120 pf),
then you have John's improved version of the 2nd Xtal Filter Mod in
your K2 already.
The 'bandwidth discrepancy' is not a real discrepancy, but is a matter
of different points used to define the bandwidth. John KI6WX used the
-3dB points and Elecraft uses -6 dB.
If your operating is mainly PSK31, I would believe that you would want
to use a more narrow bandpass rather than a wider one to increase the
Signal to Noise ratio in the passband - but then each to his own. I
personally prefer using a filter of about 1 kHz for PSK31 operation so
I can drop the louder signals out of my operating passband (yes, I use
the VFO knob for tuning as well as clicking on the screen to select the
correct signal). The KI6WX 2.2 kHz bandwidth is now a part of the
standard Elecraft KSB2 for new builds (but Elecraft specs it at 2.3 kHz
at -6 dB), and I would recommend that filter for more voice power in
the passband (and it is a bit flatter than the 'original' filter from
Elecraft).
73,
Don W3FPR
...
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