K3 P3 OK I have another question.

[k6dgw]

P3 is in Fixed Mode, that's not the right term but the center frequency
stays put and I tune across it until I get to the edge and then it
switches.  I normally have a few fixed frequency spurs, they mainly come
from the wireless company's RAP at the top of my tower, there are two
backhauls and one distribution radio.  I don't mind it, I don't
interfere, and we get free internet.

Lately, sort of after I calibrated my K3 S-meter with my svc mon and set
the P3, I'm seeing very large "spurs" I can't tune to ... they move as I
tune.  I'm pretty sure I don't have the IF mod for the P3.

Anyone know where they're coming from?  When I "calibrated" the P3 to
the S-meter, I had to run the setting way down to the -20 range.
Signals all look good, just these big couple of "spurs."

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org

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[Geoffrey Mackenzie-Kennedy-3]

Fred,

Do the "spurs" appear on all bands?

Are the "spurs" still there if you disconnect the antenna from your K3?

When you tune, does the fequency of each spur change by the same amount as
the change in "zero beat" frequency due to tuning?

If the "spurs" disappear, then their source is outside of the K3 - P3 of
course.  The answer to my third question would help to determine whether or
not the "spurs" are being "heard" by a spurious response of the K3's
receiver, be the source internal or external, and which response.


73,

Geoff
LX2AO


On April 28, 2012 at 04:39 +0200, Fred Jensen wrote:

<snip>


> Lately, sort of after I calibrated my K3 S-meter with my svc mon and set
> the P3, I'm seeing very large "spurs" I can't tune to ... they move as I
> tune.  I'm pretty sure I don't have the IF mod for the P3.
>
> Anyone know where they're coming from?  When I "calibrated" the P3 to
> the S-meter, I had to run the setting way down to the -20 range.
> Signals all look good, just these big couple of "spurs."
>

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[k6dgw]

On 4/28/2012 6:22 AM, Geoffrey Mackenzie-Kennedy wrote:
> Fred,
>
> Do the "spurs" appear on all bands?

Yes
>
> Are the "spurs" still there if you disconnect the antenna from your K3?

Yes
>
> When you tune, does the fequency of each spur change by the same amount
> as the change in "zero beat" frequency due to tuning?

Yes.  I can't "tune to the P3 signal"
>
> If the "spurs" disappear, then their source is outside of the K3 - P3 of
> course. The answer to my third question would help to determine whether
> or not the "spurs" are being "heard" by a spurious response of the K3's
> receiver, be the source internal or external, and which response.

I think the problem is I don't have the K3 IF level mod [replace a
resistor I think].  I finally dug out the service monitor and calibrated
my K3 S-meter [after about 3 years :-)].  It had always seemed a little
"stingy," as we used to say.  Then I set the P3 gain to give me -73 dBm,
and I had to turn it way up ... way way up.  My guess right now is that
it is so high that the stray signals from the K3 are showing up.  I
guess I'll need to make the IF mod.

Thanks and 73,

Fred K6DGW
Auburn CA

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