An/prc-66b
This is what can be found in the AN/PRC-66B Data Summary.
Radio Set AN/PRC-66B is a small manpack radio designed for short range ground to-air or ground-to-ground communication. It is also capable of transmitting a tone modulated carrier for direction finding purposes. It is normally carried on the body but can also be used as a vehicular set with a suitable adapter kit.
The AN/PRC-668 is a compact, light weight, completely self-contained amplitude modulated UHF transceiver. The radio can be tuned in 50 kHz increments to any one of 3500 channels in the 225 to 399.95 MHz frequency range. The required operating channel can be quickly selected by setting knob operated digit dial numerals in three indicator windows. The frequency selector knob settings result in corresponding "step" changes or increments in the output frequency of a frequency synthesizer (which produces the rf input frequencies to the transmitter and receiver). The rf output frequencies of the frequency synthesizer are generated by a stabilized master oscillator (SMO), with tuning and frequency division provided by logic circuitry and referenced to a built-in frequency standard. The relatively light weight and small physical size of the transceiver is mainly due to the use of hybrid thin-film or monolithic integrated circuits and to miniature discrete parts contained in encapsulated circuit blocks.
My sources show that 218 were manufactured.
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