[GreenKeys] Military RATT mark high/low change

[Nick England]

Evidently, earlier military HF radioteletype (RATT) transmitters were
designed to produce mark high. Later military gear produces mark low. When
and why did this change occur? It is a puzzlement to me that anyone would
have created such confusion on purpose. Nets would have been a nightmare.
Note- I am talking about the RF frequency being low or high.
Cheers
Nick
-- 
Nick England K4NYW
www.navy-radio.com
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