[Elecraft] PX3 Problem?

[Matt Zilmer]

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]