Jim
Really appreciate this information and going over it now to make sure I
understand the limits. The presentation is well done.
How did you capture the SVGA images?
Dave K5MWR
On 3/13/2017 10:53 PM, Jim Brown wrote:
Hi Dave,
The P3 is quite good for measurements, and the SVGA card is even
better. Here's a collection of work I've done with whatever rigs and
amps I could get my hands on to measure.
http://k9yc.com/P3_Spectrum_Measurements.pdf
In my experience, if you keep the K3 within its linear region, you'll
get good data from the P3 if you understand the measurements you're
making. Limitations -- the dynamic range is 100 dB, but you can only
display 80 dB on screen. For all of the operation I do, I use the P3
with a lot of averaging and a slow waterfall, fairly large waterfall.
For measurements, I use the P3 in Peak reading mode and let it
accumulate peaks for a while. I make the amplitude display pretty
large, set it for 80 dB, and adjust levels to fill the amplitude screen.
When I'm checking CW bandwidth, I send a series of dits in the range
of 35 WPM for at least 20 seconds I reset the peak a second or so
after I've started sending dits so I don't see any initial transient
that might be present. Notice that I set the span for a fairly narrow
bandwidth.
The annotations you see for bandwidth are obtained by moving the
cursor to each data point and writing down the readings, and they are
the DIFFERENCE between the high and low points.
If you want to show data more than 80 dB below the peak of the signal,
you can repeat the measurement with the reference level reduced by 20
dB. More than that and the P3 will overload.
73, Jim K9YC
On Mon,3/13/2017 6:03 PM, K5MWR via Elecraft wrote:
I am trying to use my P3 to evaluate signals from other hams here in
my community. While I know the K3s is excellent, I am not sure what
to expect out of the P3 in terms of phase noise or response under
high signal conditions. I can always pad to lower the signal but that
will not help with any P3 internal phase.
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