BBG-RSSS Serial to Synchro Converter

The Redundant Serial to Synchro System (RSSS) is a stand-alone system, which provides conversion of serial signals into high power synchro signals. The RSSS provides two redundant channels (four total) of serial to synchro conversion.


  • Radar Systems (antenna azimuth)
  • Navigation Systems (gyrocompass, speedlog, course, pitch, and roll)
  • Industrial Processes (position, velocity)
  • Meteorology Instruments (wind speed and direction)
  • Many Others

The RSSS is factory configurable to customer requirements for easy field installation. Models available include 6.81V resolver, 11.8V and 90V synchro at both 60 and 400 Hertz. The RSSS provides two dual redundant channels of serial to high power synchro conversion. Each channel has its own power supply and is fault protected against over current and over temperature faults. In addition, the RSSS provides remote control of outputs, local and remote BIT status and internal kick circuitry for added control and protection. An onboard microcontroller configures the card from power up or reset and provides all signals and control to read the serial input information and output the synchro/resolver information.

Health monitoring of each 1X/36X channel for overcurrent, over-temperature and loss of reference is provided via a contact closure status signal. Serial data formats, power outputs, synchro and resolver voltages and frequencies are factory configured to user requirements. The BBG-RSSS-90-400-1 operates on 115 Volt, 60 Hz AC power to convert serial inputs into high power synchro outputs. The RSSS accepts serial data in RS-232, RS-422, RS-423, RS-485, or MIL-STD-188C protocols. Serial baud rates are switch selectable at: 2400, 4800, 9600, 19,200, and 38,400 bits per second. Default serial input is 4800, 8 bits, no parity, and one stop bit (4800, 8, N, 1).

Card Layout:


  • 6.81Vrms Resolver
  • 11.8 or 90 Vrms Synchro
  • High Efficiency
  • 125 VA (Peak), 30VA (Continuous) Output
  • Short Circuit and Transient Protected
  • Temperature Protected
  • Enable, BIT and Kick Circuitry
Technical Specification
Parameter Value Units
Power Input 115 Volts AC
60 Hertz
6..3 Amps
Temperature Range
Operating Temperature -25 to +85 °C
Storage Temperature -65 to +125 °C
Serial Message NEMA-0183
Serial Protocol RS-232/422/423/485 or MIL-STD-188C
Reference Input 115 Volts AC
60/400 Hertz
1 Amps
Synchro(Primary 1X) 90 Volts
60/400 Hertz
125 VA (Peak)
30 VA (Continuous)
Synchro(Primary 36X) 90 Volts
60/400 Hertz
125 VA (Peak)
30 VA (Continuous)
Synchro(Secondary 1X) 90 Volts
60/400 Hertz
125 VA (Peak)
30 VA (Continuous)
Synchro(Secondary 36X) 90 Volts
60/400 Hertz
125 VA (Peak)
30 VA (Continuous)
Synchro(Primary 1X/36X) Open Good
Closed Fail
Synchro(Secondary 1X/36X) Open Good
Closed Fail
Accuracy +/- 30 Arc Minutes
Physical Characteristics
30.0 x 12.0 x 12.0 Inches
76.2 x 30.48 x 30.48 Centimeters