[Elecraft] KX-3 RX issues

[Wayne Burdick]

Niel,

Please email me directly with a description of how you are setting up the radio and how you're doing the nulling procedure. I also need to know:

- whether you're using the internal speaker or headphones

- how you're coupling the PX3's signal generator output to the KX3

- whether you're also attempting to monitor the process on the PX3

- the setting of RX SHFT on 40 m vs. other bands

- whether you have a KXFL3 installed

- your REF CAL frequency as displayed in the menu

Thanks,
Wayne
N6KR


On Jan 3, 2015, at 9:17 AM, Niel Skousen <nskousen at talisman-intl.com> wrote:

> 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
> 
>