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Last modified 2021-03-10

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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 +50C (-22 to +122F)
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:No FM
Spurious emissions:Less than -? dB
Microphone impedance/connector:1 Kohm / Fixed cord
Microphone input sensitivity:? mV




MISCELLANEOUS
Manufactured:USA, 1969-197x (Discontinued)
Main PCB:Single sided
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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