Joel,
Mirror images normally mean that only one channel of the I/Q outputs are
being received by the PX3. Make certain the RX I/Q cables are fully
plugged in (both ends).
So rather than "holding your mouth right", try "holding your fingers
right" to fully insert the plugs.
Start over with the default settings after checking the cable and go
from there.
I doubt the service monitor will do much unless it tunes down to the low
audio range.
You can try plugging a set of amplified speakers into the KX3 RX I/Q to
see if you get something in each channel, or if you want to get more
exotic, use an audio spectrum analyzer that will display stereo channels
and feed the RX I/Q to a computer soundcard.
The 2 audio channels from the KX3 should be shown, but out of phase.
73,
Don W3FPR
On 6/1/2016 8:31 PM, Joel Black wrote:
I recently acquired a used PX3 and am quite pleased with it. I am, however,
having a difficult time with the carrier null procedure. If memory serves, I
had a problem trying to do the carrier null on an SDR I built five or six years
ago too.
I never could quite get the signal generator in the PX3 to get to -40. It
stayed around -45. I did write everything down and did try to adjust the nulls
but I’ve either got too much noise in the shack or I just don’t know what in
the world I’m doing.
Right now, I’m listening on 75 m and I can see the center carrier plus mirror
images of each side of the carrier. The span is set to 50 kHz.
Any certain way I’m supposed to “hold my mouth” or “stick out my tongue” while
I do this? :)
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