Jack,
For any wattmeter (the one in the KAT500 included), the VFWD and VRFL
values are related to forward power and reflected power. Those are raw
numbers and some math is required to calculate the actual power and SWR.
VRFL subtracted from VFWD can be used to computer the power into the
load (in this case the input to the KAT500), but you need to know the
scaling factor that may be unique to the wattmeter.
Similarly, if you divide VRFL by VFWD, you will obtain a result that is
related to the SWR.
See the formulas associated with SWR in most any book dealing with
antennas and transmission lines.
73,
Don W3FPR
On 1/11/2018 7:07 AM, Jack Satterfield wrote:
Can someone explain the VFWD and VRFL readings in the bottom right of
screen?
When I put out a 15w tune signal, VFWD reads 225 and VRFL reads 2 to 3
Just trying to make sense of the readings
Jack
W4GRJ
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