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Last modified 2021-03-11

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Johnson Messenger 123A

A picture of Johnson Messenger 123A

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 +50C (-22 to +122F)
Power supply:13.8 VDC
Current drain/power consumption:RX: 400 mA (Squelched)
TX: 1.2 A
Antenna impedance/connector:50 ohm / SO-239
Dimensions (W*H*D):157*62*245 mm (6.18*2.44*9.65")
Weight:1.66 Kg (3.66 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:2.5 W at 10% distortion / 8 ohm
External speaker connector:




TRANSMITTER SECTION
RF output power:~3.5 W (5 W inpit)
Modulation system:
Max FM deviation:No FM
Spurious emissions:Less than -50 dB
Microphone impedance/connector:? ohm / Fixed cord
Microphone input sensitivity:? mV




MISCELLANEOUS
Manufactured:197x-197x (Discontinued)
Main PCB:
Additional info:Approximately 705000 units were manufactured
Related documents:Service manual (33.9 MB)
Sams Photofact #:CB-47 (July 1973)
Modifications and fixes:
Reviews:
Options/Accessories:
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