User's Manual

RANGE INFORMATION
The following table gives an indication of the typical ranges to be expected between a transmitter
and receiver that have simple end-fed dipole antennas.
The following assumptions have been made in the calculations:
line-of-sight between antennas
0dB gain for the transmitter and receiver antennas
0dB loss for connectors and cables between the antenna and the radio connector
20dB fade and environmental margin
-100dBm received signal strength, allowing for digital and analog signals
Range versus TX power
Frequency (MHz) Power (mW) Power (dBm) Range (km)
173 1mW 0 1.4
173 10mW 10 4.4
173 100mW 20 13.8
173 500mW 27 30.9
TECHNICAL SPECIFICATION
Frequency of operation
: 216 to 219MHz (other frequency bands available)
Channel spacing : 12.5kHz (25kHz available as an option)
Number of RF channels
: One, set by PIC micro controller (contact Sales Office for
serial channel select option)
RF output power
: 2W nominal at 12V DC
Frequency stability : ±2.5ppm over temperature range (12.5kHz version)
Supply voltage : +12V DC nominal (+10 to +14 volts possible)
Supply current
Transmit : 500mA typical at 2W
Receive : 50mA typical
Size : 119 x 57 x 21mm (l x w x h) including connectors
Weight
: 120 gms
Temperature (operating) : -30 to +55 °C standard
Temperature (storage)
: -30 to +70 °C