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I've compared my daily driver Daiwa 501 to a Bird and they were very close. The Daiwa was a wee bit conservative in its reading on the 150 watt scale, but it is still very close to the Bird.
I use Daiwa-type MFJ meters to observe the input side of amplifiers. Since the SWR tends to change as drive level rises and falls, it tells you right now what your mismatch is under all drive levels. The design is legit.
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