Posted by
AJSOENKE on
Jan 13, 2008; 1:50am
URL: http://elecraft.85.s1.nabble.com/New-K3-SN-207-built-but-question-on-AM-Filter-tp458592p458625.html
In a message dated 1/12/2008 3:40:37 P.M. Pacific Standard Time,
[hidden email] writes:
Hi All
just built my K3 up to the 10 watt level (still to fit the 100w pa) have
been giving it a quick test and have a question, i have fitted the AM filter in
FL2 (The FM will go in FL1) and the stock filter in FL3 (2.7KHz), i have set
the filters for all modes and set FL2 (6KHz) for AM mode and also selectable
in SSB Modes.
now when i select SSB and tune to a AM signal i can alter the bandwidth to
anything up to 6KHz, when i switch to AM i can only adjust the bandwidth up to
3KHz , the audio sounds like it is a 3KHz filter too, what am i doing wrong
since i cant set the 6KHz bandwidth in AM.
any ideas???
regards
Paul M0BMN
K3 S/N 207
++++++++++++++++++++
It's working OK. AM bandwidth includes both sidebands. Also, if you tune in
an AM station using AM mode and then switch to a SSB mode, you will note a
change in the fidelity (audio band response). There was much discussion on the
list a while ago on the subject. I'm looking toward the release of the fm
filter that should be in excess of 12 Khz, thus improving the fidelity. The
advantage of the 6 KHz filter in AM is primarily for transmitting, to maintain a
legal bandwidth, and to eliminate the heterodynes to some degree.
Al WA6VNN
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