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SB Series


Mizuho SB-2M

The SB-2M is a 2 meter SSB/CW portable, with 1W output. It was sold by Mizuho in the mid 1970s. The rig runs on internal AA cell batteries or from an external 12V DC source.The SB-2M featured a very sensitive single conversion receiver. The rig was VXO controlled with each of four crystals provding 50kHz of coverage, for a total of 200Mhz of the 2m band. Crystals for 144.100-144.300 were provided from the factory. The SB-2M had a built-in telescopic whip antenna as well as an SO-239 connector on the rear of the radio for use with an external antenna.

SB-2M Internal View


Frequency Coverage:
Four 50kHz segments between 144.000-144.400MHz
Mode: A3J (USB), A1
Frequency Control: VXO
Frequency Stability: within 200Hz per 30 minutes from 60 minutes after power on
Power requirements: 12-13.5VDC (operational: 10-14V DC)
Power consumption: max. 400mA transmit, 70mA receive with no signal
Size: 190mm(D) x 120mm(W) x 56mm(H)
Weight: 1.4kg

RF Output Power: 1W (PEP)
Spurious Radiation: less than -50dB
Carrier Suppression: more than 40dB
Unwanted Sideband Suppression: more than 40dB

Receiving System: single conversion
Intermediate Frequency: 9MHz
Sensitivity: less than 0.5µV for 15dB S/N
Selectivity: more than 2.4kHz at -6dB, less than 4.8kHz at -60dB
Audio Output: 1W at 8 ohms

Internal view - top
Internal view - bottom

Manual (including schematic) (PDF format)
Schematic Diagram (PDF format - high resolution)

-Last updated 9/20/2004