[Elecraft] New K3 SN#207 built but question on AM Filter

[AJSOENKE at aol.com]

In a message dated 1/12/2008 3:40:37 P.M.  Pacific Standard Time, 
m0bmn at yahoo.co.uk 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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