Hi Dave,
Take a look at the screen grabs in
http://k9yc.com/P3_Spectrum_Measurements.pdf
These were done two ways. The ones without the SVGA were saved from the
P3 Utility. Those with the SVGA were saved to a USB thumb drive via the
SVGA menu. These data were all obtained by accumulating peaks on the
signal. Before saving the screens, I used the cursor to points along the
curve on both sides to document the frequencies and levels and wrote
them down. Then I saved the screens.
Note also that there are small calibrations along the top of the screen,
and that these are sub-divisions of the scan width. Using graphics
editing software, it's possible (not easy) to turn the screen grab
negative so that the background is white and the traces are some color
dark enough to print. When using these calibrations, it helps to set the
scan width to a the smallest value that contains all the data and that
makes these calibrations a convenient scale. When printing the graphics,
it helps to scale the image so that the spacing between calibrations is
the same or close to whatever ruler is available. Also, decimal rulers
help.
The edited graphics can be printed, vertical lines drawn, and points
picked off with an architect's or engineer's scale. I've done this with
some P3 data, and also ARRL Lab data for which data files were not
available. Older engineers (those of us trained 50 or more years ago)
learned these techniques (and a lot more) in our freshman year. Data
for Fig 2 in k9yc.com/TXNoise.pdf was obtained by applying these methods
to the plots on Pages 1 and 2.
If this sounds like a lot of work, you're right. Which gives you an idea
how much time I put into producing those reports. :)
73, Jim K9YC
On 9/16/2017 10:43 AM, Dave Cole wrote:
I am looking to impress a grid structure on the P3, as opposed to some
lines I need to move. I want to be able to document exactly how wide
something is signal wise, by taking a snap of the signal, then looking
at it with my computer.
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