I can't speak to the P3TXMON accuracy. I don't think it's specified anywhere,
however, I don't own one and just skimmed the documentation.
That said, you should be worrying about your "calibrated" VSWR tester. It's
lying to you. You would pay big bucks to get a precision termination guaranteed
to 1.01 (46 dB return loss).
To have a power dummy load that good would be astounding.
On 9/8/2015 10:49 AM, Robert Nobis wrote:
I am having a VSWR measurement accuracy issue with my P3TXMON. I have a
calibrated VSWR tester that indicates my antenna and feedline VSWR is 1.05:1.
When I connect the P3TXMON and transmit, the PS display shows my VSWR is 2.0:1
into my feedline and antenna.
I also tried testing into a dummy load. The VSWR tester shows a VSWR into the
dummy load of 1.01:1, whereas the P3TXMON shows a VSWR of 1.29:1.
Power level readings on the P3TXMON are within 5% of measured power levels
using a power meter, so the P3TXMON is reasonably accurate measuring the
transmitted power.
In reviewing the P3 manual, I do not see any methodology for calibrating the
VSWR measurement accuracy for the P3TXMON.
Any suggestions on how to calibrate the P3TXMON for better measurement accuracy?
Thanks and 73,
Bob Nobis - N7RJN
[email protected]
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