David wrote:
My meter has lowest range of 3W FSD. I do have a digital power meter and
directional coupler, would it be best to manually measure fwd power and
reverse pwr and calculate SWR ?

On the upstream side of the diodes (if any) in the directional
coupler, you might be able to obtain AC measurements proportional
to the forward and reflected power, depending upon the sensitivity
of your meter. It could also be done using an o'scope.
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73, Cecil http://www.qsl.net/w5dxp