On Fri, 8 Mar 2024, John Vendely wrote:
The reason for various military branches switching from MARK high to
MARK low is surely one of the world's great mysteries, on par with the
construction of the pyramids. From an engineering perspective, the
choice is entirely arbitrary, but so far as I can see, prior to the U.S.
Army's introduction of the MD-522 in 1967, MARK high was the
convention. So why change? This must have been a bit confusing at
times for Army RATT operators, since their existing GRC-26 and GRC-46
equipment was MARK high...
Perhaps it may have something to do with higher frequencies being
attenuated or something?
-- Dave (vk2kfu)______________________________________________________________
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