This transmitter is frequency modulated. Audio transmitter is frequency modulated and employs over 10 db of automatic gain adjustment to compensate for variations in voice levels. Audio section has an independent 5-volt supply regulator for low noise performance. Internal loop antennas are 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 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. Control Utilizes a high performance microprocessor and external permanent memory for storage of setup parameters and keypad addresses.