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Last modified 2022-01-12

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Johnson Messenger 123

A picture of Johnson Messenger 123

SPECIFICATIONS

GENERAL
Type:Citizen band transceiver
Frequency range:26.965-27.255 MHz
Channels / tuning steps:23
Mode:AM
Frequency control:XTAL matrix (14 XTALs)
Frequency stability:±0.005% @ -30 to +50°C (-22 to +122°F)
Clarifier or Delta tune:No
Power supply:13.8 VDC
Current drain / power consumption:RX: 350 mA (Squelched)
TX: 850 mA
Antenna impedance / connector:50 ohm / SO-239
Dimensions (W*H*D):157*64*222 mm (6.19*2.5*8.75")
Weight:2.27 Kg (5 lb)
Other features:




RECEIVER SECTION
Receiver system: Single conversion superheterodyne
IF: 455 KHz
Sensitivity:0.5 uV (10 dB S+N/N)
Selectivity:6 KHz (-6 dB)
30 KHz (-60 dB)
Image rejection:
AF output power / speaker:3 W at 10% distortion / ? ohm
External speaker connector:




TRANSMITTER SECTION
RF output power:~3.5 W (5 W input)
Modulation system:High level, class B
Max FM deviation (Factory set):No FM
Spurious emissions:Better than -? dB
Microphone impedance / connector:1 Kohm / Fixed cord
Microphone input level:? mV




MISCELLANEOUS
Manufactured:USA, 1969-197x (Discontinued)
Main PCB:Single sided
Sub PCBs:
Additional info:Approximately 48000 units were manufactured
Related documents:Service manual (22 MB)
Sams Photofact #: CB-24 (November 1969)
CB-42 (October 1972)
Modifications and fixes:
Reviews:
Options / Accessories:
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