KX3 - Receive Opposite Sideband and I.F. Image Nulling question

[Mike Parkes]

I am trying to perform only page 5 of the RX sideband null procedure, and
and have a question. (My KX3 is a later serial number 9852 and according to
the RX sideband null A8.doc, most of this nulling procedure was performed
when the KXFL3 was installed by Elecraft, the only part not done(?) is the
2nd part of the  RX SHFT=8.0 I.F. Image (16 kHz) Nulling procedure which is
on page 5 of the PDF document.)

So, I am trying to work through this (using an XG3 with its freqs set per
the instructions to  1810, 3510, 5310, 7010, 10110, 14010, 18110, 21010,
24910, 28010, 50010) and I am at Page 5, Step 7:

  7. Optimize RX SHFT=8.0 I.F. image gain and phase settings as follows: a.
Set both the signal source and KX3 to the target band (starting with 160
m). Recall that *the VFO should be set 16 kHz higher than the signal source*.
Make sure you’re in CW mode. (Note: You can change bands and modes from
within the RXSBNUL menu entry.) *You should hear a strong signal,* and see
an S-meter reading of between S9 and S9+30 dB. If not, adjust the preamp
setting or the RF source level.

What strong signal? With the KX3 iin CW mode, set to 16 KHz higher than the
signal generator frequency, there is no signal at all heard! If I tune down
on 160 meters to the XG3 freq at 1.810 KHz then it is very strong S9. What
am I doing wrong here?
Thanks for any help!

Mike AB7RU
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[Grant Youngman-2]

I think there’s a problem with the instructions.  I could not hear a signal when the VFO was set 16 KHz above the KX3 frequency with RIT off as you say.  But you will hear it with RIT turned on.

Grant NQ5T

> On Jul 19, 2020, at 5:02 PM, Mike Parkes <[hidden email]> wrote:
>
> I am trying to perform only page 5 of the RX sideband null procedure, and
> and have a question. (My KX3 is a later serial number 9852 and according to
> the RX sideband null A8.doc, most of this nulling procedure was performed
> when the KXFL3 was installed by Elecraft, the only part not done(?) is the
> 2nd part of the  RX SHFT=8.0 I.F. Image (16 kHz) Nulling procedure which is
> on page 5 of the PDF document.)
>
> So, I am trying to work through this (using an XG3 with its freqs set per
> the instructions to  1810, 3510, 5310, 7010, 10110, 14010, 18110, 21010,
> 24910, 28010, 50010) and I am at Page 5, Step 7:
>
>  7. Optimize RX SHFT=8.0 I.F. image gain and phase settings as follows: a.
> Set both the signal source and KX3 to the target band (starting with 160
> m). Recall that *the VFO should be set 16 kHz higher than the signal source*.
> Make sure you’re in CW mode. (Note: You can change bands and modes from
> within the RXSBNUL menu entry.) *You should hear a strong signal,* and see
> an S-meter reading of between S9 and S9+30 dB. If not, adjust the preamp
> setting or the RF source level.
>
> What strong signal? With the KX3 iin CW mode, set to 16 KHz higher than the
> signal generator frequency, there is no signal at all heard! If I tune down
> on 160 meters to the XG3 freq at 1.810 KHz then it is very strong S9. What
> am I doing wrong here?
> Thanks for any help!
>
> Mike AB7RU
> ______________________________________________________________

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