[Elecraft] KX3 More on Sideband Nulling Issue

[Matt VK2RQ]

It looks like your KXFL3 roofing filter may either not be seated correctly, or may be faulty. If reseating the roofing filter doesn't help, then I suggest to contact Elecraft support about this issue.

73,
Matt VK2RQ

> On 17 Dec 2014, at 11:12 pm, Ed G <ed.n3cw at gmail.com> wrote:
> 
> 
> In re-running the KX3 opposite sideband nulling procedure, I am seeing more
> I don't understand.  
> 
> I have very carefully set all parameters according to the procedure, so I'm
> quite sure RIT, normal CW, dual receive is off, etc are set properly.  The
> automatic null operation works fine for FL1 (I can hear and see the null
> being found), but does not null at all for FL2 or FL3.  There is no change
> in test signal level for FL2 and FL3 when the automatic null procedure (or
> manual for that matter) is running. Screen ends up with Gain 00. Anomaly
> exists on all bands.
> 
> In actual operation, the filters seem to work properly, and the display
> indications for width and filter selection are as they should be.  The
> problem is that there is no opposite sideband suppression at all when FL2 or
> FL3 are selected.  That's also what I am seeing during the automatic null
> procedure, when no change is observed in the signal level as the null
> operation progresses.  There is good suppression when FL1 is selected.
> 
> This KX3 is factory-built, S/N 0162, latest firmware.
> 
> Any ideas?
> 
> --Ed--
> 
> 
> 
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