CIRCUIT DESIGN, INC.
CDP-RX-03AS UHF Radio Data Module Operation Guide
3
GENERAL DESCRIPTION & FEATURES
Features
•
868-870 MHz & 433-434MHz UHF band. Compatible with European EN 300 220 standard
• Very small compact integrated device with robust metal housing
• FM narrow band modulation and high frequency stability
• Low current consumption, ideal for mobile application
• Control terminal for switching the power on/off
Applications
• Remote control system
• Telemetry system
• Social alarm system
• Security alarm system
• Paging system
General description
The CDP-RX-03AS UHF FM-narrow band receiver is developed to cover a band plan of ERC
Recommendation on Short Range Device (SRD) in the range of 868-870MHz and 433-
434MHz ISM band. The receiver design is based on the double Super-heterodyne principle
with PLL control enabling high signal sensitivity, high selectivity, and high frequency stability
not achieved by simple SAW resonator receivers or other low cost designs.
Extensive filtering by an integrated unique SAW filter element enables operation in hazardous
areas where interference may be expected. Steadily increasing use of the available frequency
spectrum demands the application of narrow band systems for maximum operation reliability
and fairness to other users of the ISM band.
The CDP-RX-03AS receiver module is designed to match the CDP-TX-03S and the CDP-TX-
04S transmitter modules, though signals from other FM-narrow transmitters can be received as
well.
The receiver frequency must match with the transmitter frequency to enable reception. The
CDP-RX-03AS is designed for PCB mounting. A simple wire can be soldered to the antenna
input or the antenna can be printed on the PC board. Antenna of impedance matching with
each frequency should be used.
The receiver module has AF, DATA and RSSI signal out puts, and one control pin.
