KX-3 RX issues
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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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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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 <[hidden email]> 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 > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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