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The Early 1930's MOPA

The "MOPA" was a popular design in the 1930's. It was quite simply a "power oscillator" designed to drive an antenna directly. Many radio transmitter designs of the late 1920's through to the mid 1940's were of the MOPA type. It was only natural that Rife and Hoyland would have considered using such a design.

One MOPA in particular however has special interest. In various early Rife records it is mentioned that Rife was supposedly a commander in the US Navy. If that was the case (it is unconfirmed) then he would probably have had access to Naval equipment. Also of course San Diego was the site of a major US Naval base, so any such equipment would have been "right at his front door" so to speak.

The power systems in ships are quite different to conventional domestic power systems. In particular, all power used in a ship needs to be generated on board, and for sensitive equipment needs to be stabilised. It was therefore common to drive radio transmitters and the like from their own battery banks. The power from the batteries was run through a motor generator that converted the DC from the batteries to high frequency AC and this could then be transformed normally.

It is interesting to note that Rife's original machine was said to run from batteries and motor generators. A shipboard transmitter would have already had all such required power generating equipment. Rife's original machine was also said to be large, a shipboard MOPA would also have been large. In one of his descriptions of his early machine Rife says he used "six stages of amplification" which ended in a 50W Telefunken tube.

Bob Harrison found details of a Naval Machine that fits this description very well, it is the RMCA ET-3626-C Transmitter. It doesn't have "six stages of amplification" as such, but it uses 6 parallel 50W tubes (the 50W Telefunken tube was common) in a combined power booster stage to give 300W total output. So whilst an engineer would not call these "stages", the description does fit well in layman's terms.

I will present the schematics below for the time being and will write more in the way of description and how I believe this machine could have been modified to be a Rife machine as I get more time.

ET-3626-C Master Schematic

Auxiliary Power Supply

Note the receiver circuit built in.

Another Diagram Showing Complete System