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Model No.: DL-R18A Description:GPRS RFreceiver module Product Detail: DL-R18A is a kind of UHF high frequency receiving module with perfect performance, adopting advanced RF integrated circuit, super heterodyne modulate mode. It is widely applied in some spot with high interfere and severe conditions. 1. Application:a. Wireless remote control system for garage gate;b.Various anti-theft system;c.Industrial remote control, remote measurement and remote sensing;d.Data transmit with low rate;e.Anti-theft alarm signal receiving and various remote controls for home-appliances.2. Technical Specifications:Operating voltage: 5.0V±0.5V Operating current: ≤9.5mA (5.0VDC) Operating principle: super heterodyne Modulate mode: OOK/ASK Operating frequency: 315MHz, 433.92MHz, customized frequency is available Bandwidth: 1MHz (315MHz, test when the sensitivity decline to 3dBm) Sensitivity: better than -105dBm (50Ω) Rate: <9.6Kbps (at 315MHz at -95dBm) Output signal: TTL electric level entire transmission Antenna length: 24cm (315MHz), 18cm (433.92MHz) 3. Size and Pin definition4. Notes for usagea.Pls use soft lead wire or other hard metal (like telescopic antenna), It can not be either too long or too short, or it will affect the receiving distance. The antenna should be stretched as straight as possible if it is using soft lead wire, and as far as possible from the metal objects.b.The power voltage needs to be stable with low ripple factor and multilevel wave filtering (such as adding magnetic ball, inductance, capacitance etc.)c.We suggest the clock frequency of the MCU should be lower than 4MHZ if used together with MCU, the crystal should be as far as possible to the RF receiving module, or the higher harmonic of the crystal will affect the communication distance.d. There is short distance signal block up problem during the work of the ASK receiver module, pls pay attention to it during the operation.