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Last modified 2026-09-13

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Royce 604 (1-604)

A picture of Royce 604 (1-604)

SPECIFICATIONS

GENERAL
Type:Citizen band transceiver
Frequency range:26.965-27.405 MHz
Channels / tuning steps:40
Mode:AM
Frequency control:PLL (CCI3002)
Frequency stability:?%
Clarifier or Delta tune:No
Power supply:13.8 VDC (Male 2-pin jack)
Current drain / power consumption:RX: ? mA
TX: ? A
Antenna impedance / connector:50 ohm / SO-239
Dimensions (W*H*D):157*54*186 mm (6.19*2.12*7.31")
Weight:? Kg (? lb)
Other features:PA.




RECEIVER SECTION
Receiver system: Double conversion superheterodyne
1st IF: 9.78 MHz
2nd IF: 455 KHz
Sensitivity:0.5 uV (10 dB S+N/N)
Squelch sensitivity:Less than 0.5 uV (Threshold)
Selectivity:5 KHz (-6 dB)
10 KHz (-60 dB)
Image rejection:
AF output power / speaker:2.5 W at 10% distortion / 8 ohm
External speaker connector:TS "Minijack" (3.5 mm), 8-16 ohm




TRANSMITTER SECTION
RF output power:4 W
Modulation system:
Max AM modulation (Factory set):More than 80%
Max FM deviation (Factory set):No FM
Spurious emissions:Better than -60 dB
Microphone impedance / connector:500 ohm / 4-pin (Male GX16 locking ring jack)
Microphone input level:? mV




MISCELLANEOUS
Manufactured:Japan, 1977-1978 (Discontinued)
Main PCB:
Sub PCBs:
Additional info:
Related documents: User manual (3.8 MB)
Known markets and approvals: USA
FCC Data: RCB 13
Sams Photofact #:CB-239 (December 1978)
Modifications and fixes:
Reviews:
Options / Accessories:
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