Motorola MX300S

Handheld VHF/UHF Transceiver

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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 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: 2m 70cm
Frequency stability: ?
Tuning steps: ?
Memories: 48 channels in 1 bank(s)

Receiver

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

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: -
Accessories: -
RigReference ID: 5183
MPN: MOTOROLA-MX000300S

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