[Elecraft] KX-3 RX issues

[Niel Skousen]

Good Morning List,

My KX3 has a quirk that has persisted thru a factory service visit.   I'm hoping someone here has seen this before and can give me pointers on how to resolve this.

I have a very unusual 40m behavior.   I just spent a couple hours re-doing all the sideband nulling and verifying that on 40m I have a very deep null (-30 dBv) on 'center freq' as defined by the 'spot' frequency.

Previously I'd documented this, but had not checked all bands.  Today I checked every band, and it is only on 40m.   I have confirmed manual notch is OFF.    Configuration is as received from Elecraft after the RSA (which resets all the sideband nulling on an automated fixture, followed by a tech verifying since that was part of the complaint).  AF is set to 17   Note that the center tuned signal (from the PX3 calibrator) generates AFV = 1173 on all bands ( basically RX Vmax I'd assume).  The data points below correspond to the CWT symbol and the major 'tick' left and right of CWT.    

Config:
- AF = 17
- Notch = off
- Mode = CW
- BW = .350
- Base Freq = 7.199 MHz

               (L)          (CWT)     (R)
Freq      99.41         99.46     99.52
AFV         533            15          568

This effect is -30 dBv over less than 100 hz, and compared to other bands its down -38 dBv
So I'm at a loss on where to find what I've mis-configured.    Any suggestions or idea's ?

Niel
WA7SSA