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Reviews (1)
16 Sep, 2016
SWR calculation is defective
I am writing this review at firmware version 4.5 where I discovered a major fault with SWR calculations. I have reported it to the seller and the Surecom factory so the problem may be rectified in future versions. Still I wouldn't buy another unless the listing specifically states the fix.
Let's assume the meter measures accurately the forward and reflected power. The correct calculation for SWR is: gamma = sqrt(reflected_watts / forward_watts); swr = (1+gamma)/(1-gamma);
However, this meter seems to calculate gamma without using the square root: gamma = reflected_watts / forward_watts; This is incorrect and significantly wrong. In my case an absolutely terrible antenna that should have displayed SWR 2.85 showed 1.6 instead which can be considered acceptable.
So, if you decide to buy one make sure the listing shows a photo of firmware greater than 4.5. Take the froward and reflect power from the photo and do the math yourself. If your SWR result matches the photo the problem has been fixed.