Try unplugging the antenna to see if it's internally- or
externally-generated. If the artifacts remain with no antenna, only one
of the I/Q signals is making it to the PX3. This may be due to the cable
or the KX3 or PX3 3.5mm sockets. Try using a different M-M 3.5mm cable
and see if it makes a difference.
What you would see if only the I or Q signal were connected is a
symmetrical display of amplitude about the center (carrier) frequency.
Even with the "not symmetrical" spikes, I'd still guess that is the problem.
Had the same experience here with a failed / intermittent cable.
73,
matt W6NIA
On 7/16/2017 3:06 PM, Dave Sublette wrote:
I have had my PX3 for a little over a year (I think). It has been used
sparingly. Until this afternoon, it has worked perfectly. Now I see a spike
in the center of the display and periodic spikes across the entire screen.
Almost all are symmetrical in frequency and amplitude about the center line.
There are some that are not symmetrical. I have plugged and unplugged all the
cables, taking care to see that each is fully into the socket.
So, perhaps I have a failure that requires returning to Elecraft? Have any of
you had the same experience?
73,
Dave, K4TO
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--
"A delay is better than a disaster."
-- unknown
Matt Zilmer, W6NIA
[Shiraz]
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