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 MX300R is the ruggedized version of the MX300. It has most of the features of the Motorola MX300S, but is housed in an intrinsicaly safe enclosure of which the outer skin is cast in rubber. As rubber is a natural product, it might lose some of its properties over time and become stiff and brittle. This model has different knobs on the control panel, which are also made of rubber (similar to the ones used with the later Motorola SABER radios).
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