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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.

General characteristics

HAM bands
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Frequency stability
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Tuning steps
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Memories
48 channels in 1 bank(s)

Receiver

RX-range
136-174 or 403-512 MHz MHz depending on version
Modulations
FM  
Sensitivity
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Selectivity
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Filters
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Receiver system
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IF-frequencies
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Image rejection
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Audio output
?

Transmitter

TX-range
136-174 or 403-512 MHz MHz depending on version
Modulations
FM  
RF-output
VHF: 6/2.5/1 W, UHF: 4/2/1 W

Connections

Antenna
NMO
Impedance
50Ω
Other
-

Electrical

Power requirements
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Current drain RX
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TX
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Physical

Dimensions (w×h×d)
72 × 164 × 36 mm (2.83 × 6.46 × 1.42 in)
Weight
673 gr (1.5 lbs) incl battery
Form factor
Handheld
Manufactured
Between 1975 and 19xx

Other features

Usage
Commercial / Land mobile communication
Features + options
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Accessories
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RigReference ID
5183
MPN
MOTOROLA-MX000300S

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