RX-4MR50-SMD
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Technical features are subject to change without notice. AUR°EL S.p.A does not feel responsible for any da age caused by the device’s isuse.
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Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: +39.0546.941124 Fax: +39.0546.941660
01/08/2018 - Rev.A
Pag 2 di 6
The declared technical features have been obtained by applying the following testing syste :
Picture 1: Measure ent of sensitivity
Device usage
In order to obtain the perfor ances described in the technical specifications and to co ply with the
operating conditions, which characterize the Certification, the trans itter has to be ounted on a printed
circuit taking into account the following.
Power Supply:
1. RX-4MR50-SMD ust be supplied fro very low voltage safety source protected against the short circuits.
Maxi u voltage variations allowed: 3 ÷ 5,5 V. However it is preferable to aintain a stable voltage to a
predeter ined value in the range of voltage as specified above, using a "fast transient response" voltage
regulator.
2. Connect electrolytic capacitor 100uF, low ESR, close to pin 2 (+Vcc).
Ground:
The ground ust surround at the best the welding area of the odule and ust also be realized in the
lower face of the PCB in order to obtain the opti al result, with the through holes connecting the two
ground planes approxi ately each 15 .
It ust be properly di ensioned, especially in the antenna connection area, in case a radiating whip
antenna is fitted in it (an area of approxi ately 50 radius is suggested).
Antenna:
1. A whip antenna, 16,5 long and approxi ately 1 dia, brass or copper wire ade, ust be
connected to the RF input of the receiver (pin 6).
2. The antenna body ust be keep straight as uch as possible and it ust be free fro other circuits or
etal parts (5c ini u suggested distance).
3. It can be utilized either vertically or horizontally, provided that a good ground plane surrounds the
connection point between antenna and trans itter output.
50 Ohm line:
1. It ust be the shortest as possible.
2. 1,8 wide for 1 thick FR4 printed circuits and 2,9 wide for 1,6 thick FR4 printed circuits.
On the sa e side, it ust be kept 2 away fro the ground circuit.
3. On the opposite side a ground circuit area ust be present.
Digital Encoder
HCS 300
RF Generator: frequency 433.9 MHz
AM Modulation OUT RF
Decoder
HCS
Pin 3
