The MX-300 was a handheld radio, developed by Motorola in 1975. Many different variants of this radio were developed, incuding VHF, UHF and SHF versions, ruggedized versions, crystal operated channels, versions with a frequency synthesizer, and optional Digital Voice Encryption.
The Motorola MX300S is the synthesized model of the MX300. Rather than installing RX and TX crystals for each channel, the frequencies are stored in a PROM (later in an EEPROM), organised in 4 banks of 12 channels each. Depending on the variant, 2, 4, 6, 8 or 12 channels are selectable. Furthermore, also depending on the variant, an additional rotary switch might be present to select up to 4 channel banks (marked A, B, C and D). Some versions had a scan option. Digital voice encryption was also available as on option.
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