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Last modified 2025-07-24

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SoundBoy 081 (MM-081)

A picture of Sound Boy 081 (MM-081)

SPECIFICATIONS

GENERAL
Type:VHF receiver/scanner
Frequency range:76-82 / 164-172 MHz
Tuning steps:Channelized
Frequency stability:? ppm
Mode:FM
Channels / memory management: 8 regular @ 16 channels per second
One XTAL per channel
Power supply:12-15 VDC (Male barrel jack, center positive)
Current drain / power consumption:Less than 350 mA
Antenna impedance / connector:50 ohm / DIN41585 (Motorola)
Dimensions (W*H*D):118*41*164 mm (4.65*1.61*6.46")
Weight:750 g (1.65 lb)
Other features:




RECEIVER SECTION
Receiver system: Double conversion superheterodyne
1st IF: 10.7 MHz
2nd IF: 455 KHz - Ceramic filters: Two Murata CFU455D
Sensitivity:1 uV @ band centers
Squelch sensitivity:Less than 1 uV (Threshold)
Noise figure:
Selectivity:20 KHz (-6 dB)
40 KHz (-40 dB)
Image rejection:
AF output power / speaker:350 mW at ?% distortion / 8 ohm
External speaker connector:TS "Minijack" (3.5 mm), 3.2-16 ohm




MISCELLANEOUS
Manufactured:Japan, 1979-1980 (Discontinued)
Additional info: Main PCB: 8-081-005 by Marukura
Sub PCB: 8-081-006 - Switches and LEDs board

New price, 1979 in Sweden: SEK 695:-
Related documents: AF amplifier: M51513L
Modifications and fixes:
Reviews:
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