[Milsurplus] Marconi HS51

[Ralph Cameron]

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}ransmitter 
 Am researching a Cold War underground transmitter site in which a
Marconi HS51 transmitter was used. There was also one called ST3
which I believe could be a product of Standard Telephones and Cables
in the U.K. Does anyone have specs on either or both? I believe one
was used in the LF range.
 Thank
 Ralph
 V3BBM