[Elecraft] [K3] AM Filters ??

[Phil Hystad]

I just noticed some behavior on my K3 that I never noticed before since I have not used AM mode until now.  In AM mode, I noticed several things about the filter adjustment.  By the way, I do have the 6 KHz filter installed (FL2).

First observation:  the maximum filter width that I can adjust for an AM signal with the 6 KHz filter switched in is 5 KHz.  Is this normal?  So, is this value in my filter adjustment the whole signal width (both sidebands) or just half the signal width?  Note: I do not have a wider filter.

Second observation:  with other modes, CW, SSB, as I narrow down the filter width I can see each filter being switched in on the xfil display.  But, in AM mode, this does not happen.  The only filter in use is the 6 MHz filter no matter how far I narrow down the filter width (well, down to about 1.35 KHz or so which is the smallest achievable).  I assume this is normal behavior and I assume it has something to do with AM TX requiring the 6 KHz filter.

Also, if this stuff is explained in the manual can someone point it out.  I have read, what I think are the relevant parts of the documentation but I do not see this behavior explained.

73, phil, K7PEH

P.S.  Actually, did not TX on AM, just listening to an AM station -- had to go to dinner before I could get a turn.