GEM2003 FLIGHT DATA/TELEMETRY SYSTEM SPECIFICATIONS
FUNCTION  RANGE
SET
POINT
USER
 INPUT
DESCRIPTION
TRUE AIRSPEED
0-240MPH  N  Y 
REQUIRES USER INPUT OF BAROMETRICPRESSURE WITHOUT
OPTIONAL BAROMETRIC SENSOR
INDICATED AIRSPEED 0-240MPH  Y  Y 
USER PROGRAMMABLE STALL WARNING USES THIS . THE STALL
WARNING BEGINS TO BEEP AT 15MPH ABOVE THE STALL AND
INCREASES IN FREQUENCY AS THE STALLPOINT IS APPROACHED
TO A STEADY TONE AT AND BELOW STALL
ENGINE 1 RPM 0-150,00RPM 
0.5 SECOND UPDATE RATE
SELF-CONTAINED UNIT - NO SMALL MAGNETS NEEDED!
ENGINE 2 RPM 0-150,00RPM  
OPTIONAL - 0.5 SECOND UPDATE RATE 
ENGINE 1 TEMPERATURE 0-1,500 F 
THERMOCOUPLE SENSOR
ENGINE 2 TEMPERATURE 0-1,500 F    N
OPTIONAL
AIR TEMPERATURE 0-120 F 
COMES WITH AIRSPEED SENSOR
BAROMETRIC PRESSURE 0-31"HG 
 Y
USER SETABLE IF OPTIONAL AIRBORNE SENSOR NOT INSTALLED
ALTITUDE 0-30,000 FT  N
OPTIONAL AIRBORNE SENSOR
       
AIRBORNE TRANSMITTER      
THIS IS BOTH THE TRANSMITTER AND MICROPROCESSOR IN ONE
PACKAGE
TRANSMIT FREQUENCY 903-921 MHZ       
NUMBER OF CHANNELS      
TRANSMIT POWER ODBm    
THIS LOW POWER INSURES NO INTERFERENCE WITH THE RC RECEIVER
NO FERRITE BEADS NEEDED!
MODULATION FSK       
BANDWIDTH 25KHZ       
TRANSMIT BAUD RATE 9600       
NUMBER OF ANALOG CHANNELS  8      
ANALOG HARDWARE RESOLUTION 12-BITS     
THE EFFECTIVE RESOLUTION OF THE AIRSPEED IS SUCH THAT THE FIRST READING ABOVE ZERO IS 1.2MPH WITH THE RESOLUTION
GOING BELOW 1MPH AT 9MPH. THIS LOW-END PERFORMANCE MAKES THIS SYSTEM IDEALLY SUITED TO THE ACTUAL SPEED THAT MODEL AIRCRAFT FLY AT.
NUMBER OF DIGITAL CHANNELS      
SUPPY VOLTAGE 3-7 VOLTS     
USES AIRBORNE BATTERY
       
GROUND RECEIVER        
RECEIVE FREQUENCY 903-921MHZ       
NUMBER OF CHANNELS      
SENSITIVITY -118DBM       
BANDWIDTH 25KHZ       
RECEIVE BAUD RATE 9600       
RX ANTENNA GAIN 6.5DBI       
RANGE 3000+FT     
THE BACK OF THE RECEIVER SHOULD BE POINTED ROUGHLY IN THE
DIRECTION OF THE AIRCRAFT +/-25 DEG FOR MAXIMUM RANGE. CAN BE
USED AS A DIRECTION FINDER IN LOCATING A DOWNED AIRCRAFT.
SUPPLY VOLTAGE 9.6 VOLTS     
 RECHARGABLE
       
USER INPUTS        
INC(+)      
USE TO SELECT MENUES/FUNCTIONS AND INCREMENT VALUES
DEC(-)      
USE TO SELECT MENUES/FUNCTIONS AND DECREMENT VALUES
SET      
 BRINGS UP THE SETPOINT MENU AND CURRENT SETTING
AN EXAMPLE WOULD BE TO USE IT TO CHANGE THE STALL SETTING
USING THE INC/DEC KEYS
ENTER      
WHEN NOT IN A SETPOINT MENU USE TO TURN THE STALL
ALARM ON/OFF. WHEN IN A SETPOINT MENU WILL TERMINATE THAT
OPERATION.
DISPLAY 2X16 LCD     
 BACKLIT DISPLAY