[Elecraft] AM receive band width

[Mike Scott]

>So my questions are: (1) Is audio distortion on AM a known problem with the
>K3? (2) What does the LCD BW actually read? Is it an IF BW, an audio BW, or
>what, and does the displayed BW actually correspond to reality?

On my K3 I see and measure the following:

6 KHz AM filter AM mode
Band width displayed as 3.00 KHz, 
Spectrum lab -10 dB audio band 100 Hz to 3100 Hz

6 KHz AM filter LSB mode
Band width displayed as 4.00 KHz
Spectrum lab -10 dB audio band 120 Hz to 3500 Hz

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13 KHz FM filter AM mode
Bandwidth displayed as 5.00 KHz, 
Spectrum lab -10 dB audio band 100 Hz to 4200 Hz

13 KHz FM filter LSB mode
Bandwidth displayed as 5.00 KHz
Spectrum lab -10 dB audio band 120 Hz to 3600 Hz

If I had a second 13 KHz filter in the sub receiver I would try linking VFOs
and place one on upper sideband and the other on lower sideband (otherwise
know as ISB mode).
----------------------------------------------------------

AM audio much more understandable (pleasant) on the FM filter, the extra 1
KHz helps. 

AM on the 6 KHz filter on LSB is okay and using LSB/USB is best possible
reception of AM if you only have a 2.7 KHz filter. 

I will leave it up to you to decide what the LCD BW corresponds to.

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
K3-100 #508/ KX1  #1311