FM transmitter/receiver provides 433-MHz link

For applications such as handheld terminals, inventory control, and security systems, the RTFQ1 transmitter and complementary RRFQ1 receiver from OKW Electronics give you a moderate-speed, moderate-distance FM link at 433.92 MHz These hybrid modules, which have no adjustable components, typically enable links as long as 250 ft (75m) indoors and 800 ft (240m) outdoors. Data rates range to 4.8 kbps; the modules interface to standard CMOS/TTL signals. The transmitter measures 20¡Á11¡Á4 mm and requires 7 mA from a 3V supply; the receiver measures 38¡Á18¡Á4 mm and requires 7 mA from a 5V supply. The laser-trimmed units, which operate from ¨C25 to +80¡ãC, cost $9 each (small quantities).