This receiver is dual conversion crystal referenced frequency modulated. A 345 MHz RF keypad transmitter sends keypress information to the Base Station's receiver. This transmitter is frequency modulated. Internal loop antenna is enclosed and protected by the keypad housing. The system is designed to provide reliable operation in an area 100 feet by 100 feet with standard omnidirectional, quarter-wave whip antennas.
Greater range is achieved by using the optional auditorium antenna kit.
This kit includes high-gain dipole antennas that replace the standard antennas. The Base Station scans each keypad in sequence. Within each brief time slice, the Base Station is able to simultaneously determine a keypad's identification and process its response information. Polling cycles are adjustable to optimize speed to group size. Control Utilizes a high performance microprocessor and external permanent memory for storage of setup parameters and keypad addresses.