KX3: Difficulty performing I.F. image (16 kHz) nulling

[Mark Volstad]

I am attempting to perform the opposite sideband and I.F.
image nulling procedure on my KX3, per the app note (rev
A8). I had no trouble performing the opposite-sideband
nulling steps, but have run into a problem in the I.F. image
(16 kHz) nulling procedure on page 5.

Step 7(a) on page 5 states that "you should hear a strong
signal". This contradicts step 14 on page 2, which states
"Note: If you are preparing to null the RX SHFT=8.0 I.F.
image, you may not hear any signal at this time since the
VFO is offset from the signal source by 16 kHz". In fact, I
am *not* hearing any signal.

Is it safe to assume that step 7(a) on page 5 is incorrect,
and that I can safely proceed without hearing any signal?

73,
Mark   AI4BJ

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[Don Wilhelm-4]

Mark,

Step 7(a) on page 5 is correct.  Step 14 on page 2 is also correct.
Page 2 refers to having the signal source and the KX3 set to the same
frequency.
Page 5 requires that the signal source be set 16 kHz lower than the KX3
signal - you will be tuned to the opposite sideband, so the signal may
be weak.  Increase the level from the signal source or increase the
preamp gain.

If you cannot hear the opposite sideband signal, it may already have an
optimum setting.

73,
Don W3FPR

On 4/26/2014 8:42 AM, Mark Volstad wrote:

> I am attempting to perform the opposite sideband and I.F. image
> nulling procedure on my KX3, per the app note (rev A8). I had no
> trouble performing the opposite-sideband nulling steps, but have run
> into a problem in the I.F. image (16 kHz) nulling procedure on page 5.
>
> Step 7(a) on page 5 states that "you should hear a strong signal".
> This contradicts step 14 on page 2, which states "Note: If you are
> preparing to null the RX SHFT=8.0 I.F. image, you may not hear any
> signal at this time since the VFO is offset from the signal source by
> 16 kHz". In fact, I am *not* hearing any signal.
>
> Is it safe to assume that step 7(a) on page 5 is incorrect, and that I
> can safely proceed without hearing any signal?

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