What if a carrier frequency came in from the bottom. Then the signal splits to two transmitter circuits. They are tuned and with the doppler effect would cancel each other out at times. Movement would create a differential "tone" that is combined and transmitted by the top transistor.

Thanks for the reply . I partially removed the board from the frame hoping to find a note / schematic or any information but none was found . No easy way to flip the board over as it's attached to foam backing
and was professionally framed . I would hate to damage it .
Someone cared a great deal about it . Sad it was probably dumped in a estate sale and forgotten .

Ok, T1 at top could be the output section of the motion detector ?
Remote long range guidance for amateur rocket ?

So all the transistors are Fujitsu FLL100 .
I assume going from the top down and left to right T1 is pre-amp ?
Then thru a Wilkinson power divider into T2 and T3 Doherty power amplifier circuit (A)
and matching power circuit (B) composed of T4 and T5 .
Balance circuit between the two and feed into another power divider .
Most likely a high power motion detector ?