Mysterious RCA radio

[Robert Grant]

I strongly suspect that those frequencies of 14.266Mhz and 18.277MHz were not the frequencies the radio actually received and transmitted.

More likely, these crystals were used in oscillators that were then fed to frequency multiplier circuits (amplifiers deliberately used to generate harmonics). 18.277..., for example, may have been multiplied by 9 to get 164.50 Mhz, which may have been applied to a mixer circuit to convert a signal at 153.80 MHz to 10.7 MHz to feed the IF chain of the receiver.