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Last modified 2026-10-06

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Cobra 77X (By Dynascan)

A picture of Cobra 77X (By Dynascan)

SPECIFICATIONS

GENERAL
Type:Citizen band transceiver
Frequency range:26.965-27.405 MHz
Channels / tuning steps:40
Mode:AM
Frequency control:PLL (uPD858)
Frequency stability:0.005% @ -30 to +50°C (-22 to +122°F)
Clarifier or Delta tune:No
Power supply:13.8 VDC (Male 3-pin jack)
Current drain / power consumption:RX: 0.5-1.5 A
TX: 2 A
Antenna impedance / connector:50 ohm / SO-239
Dimensions (W*H*D):149*57*216 mm (5.88*2.25*8.5")
Weight:1.76 Kg (3.88 lb)
Other features:PA. ANL




RECEIVER SECTION
Receiver system: Double conversion superheterodyne
1st IF: 10.695 MHz
2nd IF: 455 KHz
Sensitivity:1 uV (10 dB S+N/N)
Squelch sensitivity:Less than 1 uV (Threshold)
Selectivity:7 KHz (-6 dB)
10 KHz (-60 dB)
Image rejection:50 dB
AF output power / speaker:4 W at 7% distortion / 8 ohm
External speaker connector:TS "Minijack" (3.5 mm)




TRANSMITTER SECTION
RF output power:4 W
Modulation system:High- and low-level Class B
Max AM modulation (Factory set):?%
Max FM deviation (Factory set):No FM
Spurious emissions:Better than -? dB
Microphone impedance / connector:? ohm / 4-pin (Male GX16 locking ring jack)
Microphone input level:? mV




MISCELLANEOUS
Manufactured:Taiwan, 197x-197x (Discontinued)
Main PCB: PC-169 by Uniden
Sub PCBs: PC-193 - Channel selector board
Additional info:
Related documents: User manual (8.3 MB)
Schematic diagram (248 KB)
AF amplifier: Two 2SC1096
RF driver: 2SC2028
RF final: 2SC2029
Known markets and approvals: USA
FCC Data: 77X
Sams Photofact #:CB-134 (August 1977)
Modifications and fixes:
Reviews:
Options / Accessories:
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A rear picture of Cobra 77X