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Last modified 2022-02-13

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Roadstar RM-550 MkII

A picture of Roadstar RM-550 MkII


Type:Citizen band transceiver
Frequency range:26.965-27.405 MHz
Channels / tuning steps:40
Mode:AM / FM / SSB
Frequency control:PLL
Frequency stability:0.0005%
Clarifier or Delta tune:? KHz
Power supply:Mains: 220 VAC (Fixed power cord)
Current drain / power consumption:RX: ? VA
TX: ? VA
Antenna impedance / connector:50 ohm / SO-239
Dimensions (W*H*D):440*140*235 mm (17.32*5.51*9.25")
Weight:5.1 Kg (11.24 lb)
Other features: PA. NB. SWR-meter. 24 hr clock. Tone control.
External selcall connector.

Receiver system: Double conversion superheterodyne
1st IF: 10.695 MHz
2nd IF: 455 KHz
Sensitivity: AM: 0.5 uV (10 dB S+N/N)
FM: 0.5 uV (12 dB SINAD)
SSB: 0.16 uV (10 dB S+N/N)
Image rejection:60 dB
AF output power / speaker:3.5 W at 10% distortion / 4 ohm
External speaker connector:

RF output power:AM: 1 W
FM: 4 W
SSB: Max 4 W (PEP)
Modulation system:
FM deviation (Factory set):1.8 KHz
Spurious emissions:Better than -? dB
Microphone impedance / connector:500 ohm / 4-pin (Metal locking ring connector)
Microphone input level:? mV

Manufactured:Japan, 198x-198x (Discontinued)
Main PCB:
Sub PCBs:
Additional info:
Related documents:
Sams Photofact #:None
Modifications and fixes:
Options / Accessories:
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A rear picture of Roadstar RM-550 MkII