This receiver is dual conversion crystal referenced frequency modulated. A 345 MHz RF keypad transmitter sends keypress information to the System Controller's receiver. This transmitter is frequency modulated. Internal loop antennas are enclosed and protected by the keypad housing. The system is designed to provide reliable operation in an area 75 feet by 75 feet with standard omnidirectional, quarter-wave whip antennas.
Greater range is achieved by using the optional antenna kit.
This kit includes high-gain dipole antennas that replace the standard antennas. Speed System Controller scans each keypad in sequence. Within each brief time slice, the System Controller is able to simultaneously determine a keypad's identification and process its response information. Polling cycles are adjustable to optimize speed to group size. When used with Reply -compliant distance learning software, data from multiple sites may be combined and processed with no additional delay.