elsema 433.920mhz ask radio da ta receiver , R433E description the R433E is a radio data receiver to receive digital data. baud rates of 300 to 4800 bps can be received. the low cost, small size, wide operating voltage combined with low current consumption makes it ideal for various applications. the receiver is available with a plastic case or as a printed circuit board assembly only the pcb assembly only is called r433. the printed circuit board assembly allows oem manufactures to inte grate the receiver with their own products. r433 technical data supply voltage 8.0 to 28.0 volts dc. current consumption 14ma receiver type single conve rsion superheterodyne receiving freq 433.920mhz oscillation system vco with 10ppm crystal controlled reference oscillator operating temperature range -5 to 50c if freq 320khz selectivity -3db at 20khz sensitivity better than -107dbm or 1v type of demodulation amplitude shift keying. (ask) baud rate 300 to 4800 bps with 50% duty cycle data output level 0-5v frequency response 150 to 2400 hz w ith 50% duty cycle (other duty cycles R433E 433.920 mhz ask radio data receiver features ? receives digital data ? baud rates 300 - 4800bps ? low cost, small size, low current consumption application ? telecommand systems ? security systems ? alarms ? radio data communications ? commercial / industrial telemetry
elsema 433.920mhz ask radio da ta receiver , R433E will degrade sensitivity) connections supply & data out: 3- way screw type terminal block (r433 without case); 4-pole mic socket (R433E with case). mounting bracket brass bracket suitable to clamp onto antenna pole dimension 115 x 80 x 58mm excluding antenna & mounting bracket weight 200g excluding antenna & mounting bracket usable transmitter t433 data transmitter antenna 50 ohms, 433mhz antenna R433E data format it is important to input the correct data format otherwise the receiver will have a lower se nsitivity which will result in a re duced transmission range. the R433E receiver data slicer is set for 50/50-duty cycle, th erefore the ?data in? should have a 50/50-duty cycle. the 50/50-d uty cycle data can be pulse-width modulated to transmit resets, 0's or 1's. see diagram below : a 50/50-duty cycle will have an average dc signal resulting in a constant reference for the data slicer. users should use pulse -width modulation to transmit data with logic 1's or 0's. if a different duty cycle is used, for exam ple 66/33 ( manchester format) the data s licer in the receiver will try to adjust it self to the average dc signal. since this average dc signal is changing with different data bits this will result in a constantly changing reference for the data slicer, resulting in lower sensitivity. see diagram below : *only 50/50 duty cycle data is suitable fo r the t433 transmitter and r433 receiver. manufactured by elsema pty ltd 3/10 hume rd, smithfield nsw 2164 ph: 02 9609 4668 fax: 02 9725 2663 website: http://www.elsema.com
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