@BlueCoder's nice answer to Syncom-3 was the first geostationary satellite. Anyone know of a description of the onboard electronics? mentions that the the master oscillator was doubled eight times to get to (nearly) X-band.
The answer links to NASA Technical Report R-252 “Syncom Engineering Report, Volume II” and in the neighborhood of pages 10 to 12 there is a description of the RF system and Figure II-7 shows a block diagram.
28.8917 Mz times 256 ($2^8$) does indeed equal 7396.275 MHz, but the block diagram only shows seven frequency doublers rather than the eight mentioned in the text.
How does the "missing" doubling come about? What is a "Multiplier Inverter" and is that the "secret sauce" that does it?