In a message dated 1/12/2008 3:40:37 P.M. Pacific Standard Time, [EMAIL PROTECTED] 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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