[Elecraft] K3s AM filter

[Don Wilhelm]

Dave,

That is not a problem, but a result of AM modulation.

The filters work at the IF passband.
The 5kHz is the audio bandwidth.
For an AM signal, the IF bandwidth must be twice the audio bandwidth - 
there are 2 sidebands, and the audio width is only equal to the width of 
one sideband.

You could try synchronous AM receive.

73,
Don W3FPR

On 11/1/2019 8:27 PM, Dave Sublette wrote:
> Good evening all,
> 
> I installed the 6 KHz filter into FL1 on the main receiver today.  I did
> not put one in the sub receiver.  To do this, I had to move four filters
> from slots 1 thru 4 to slots 2 thru 5 in both receivers. So now I have 6
> KHz in FL1 in the main Rx, no filter in FL1 in the sub receiver and FL2
> thru FL5 match widths in the main and sub receivers.  I made the
> appropriate entries in the gain and setup menus.  Checking them on several
> bands shows that all appears to be in order.
> 
> However, in the AM mode I can only widen the passband to 5.0 KHz.  Is this
> normal operation, or have I missed something?
>