[Elecraft] CW/SSB K2 Filter Flexibility

Fri Apr 18 22:59:07 2003

I believe you can set FL2 and upward to whatever bandwidth you wish.
They merely suggest "default" bandwidths.  They do suggest you turn FL4
off unless you are going to use PSK31 in which case, a 1 Khz bandwidth
is suggested.  But again, that is only a suggestion.  You are free to
follow it or not. Frankly, I think more filters of different widths are
of questionable utility.  
FL1 is fixed in the sense that the 2.2 Khz SSB filter is used for both
transmit AND receive.  You do not want to vary that one because of
possibly adverse effects on the transmitted signal.  But the other
filters are for receive only and will affect only what you hear.  Of
course, in addition to the filters set up for SSB you still have the CW
filters available for use in that mode.

Bruce - W8FU
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Linden, Mike
(BRC-Hes)
Sent: Friday, April 18, 2003 3:56 PM
To: [email protected]
Subject: [Elecraft] CW/SSB K2 Filter Flexibility

  I've recently joined the list because I'm planning on purchasing a
pretty
much loaded K2 around the end of the year (my K2 "account" should be
fully
funded by then). After reading MANY reviews on the K2, both by magazines
and
individuals, I'm absolutely positive that this is the radio for me.

  I'm essentially looking for an overview of the configuration
possibilities
for filtering on a CW/SSB K2. Table 8-1 on page 86 of the K2 manual rev
E
shows that each CW filter can provide unique CW and SSB configurations.
This
looks great.

  But, it appears the situation changes when one adds the SSB adapter
(which
I plan to do). Table 3 on page 20 of the KSB2 manual rev C shows a
similar
table for a K2 with the SSB adapter. I assume OP1 refers to the 7-pole
fixed-width crystal filter that is on the SSB adapter that has a width
of
2.2kHz?

  Given the above and the suggested arrangement in table 3, it appears
that
FL1 will provide 2.2kHz for both CW and SSB and FL2 will also provide
2.2kHz
for SSB. Would it be possible to use the CW filter for SSB's FL2 instead
of
OP1 in order to obtain a 2.0kHz bandwidth for the SSB FL2 setting? If
so,
since this isn't the suggested filter setting, I assume there must be
some
sort of downside to such a configuration?

  Thanks, Michael N9BDF

PS  The "Amateur Radio Emergency Communications Consistency Act" (HR
1417)
and the "Amateur Radio Spectrum Protection Act" (HR 713 & S. 537) have
been
reintroduced in Congress. Please contact your Congressmen to ask for
their
support of these bills! See the following ARRL link for details:
http://www.arrl.org/govrelations/

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