AUREL AC-RX Economic Receiver Instruction Manual

: June 12, 2024
: AUREL

Table of Contents

AUREL AC-RX Economic Receiver
Product Information
Technical Features

AUREL AC-RX Economic Receiver

Product Information

AC-RX Receiver The AC-RX Receiver is an economic receiver with low consumption, low voltage supply, and a variable coil. It has been optimized for use with the HCS KEELOQ decoder/encoder family. The receiver operates at a working center frequency of 433.92 MHz and has a voltage supply range of 4.5V to 5.5V. It features a low absorbed current of 2.5mA to 3mA and a high RF sensitivity of -100dBm. The receiver also has a square wave output with a frequency of 3KHz and output voltages that depend on the load applied.

Technical Features

Working center frequency: 433.92 MHz
Voltage supply range: 4.5V – 5.5V
Absorbed current: 2.5mA – 3mA
RF sensitivity: -100dBm
Square wave output frequency: 3KHz
Output low voltage: Gnd+0.4V
Output high voltage: V (dependent on load applied)
Switch-on time: 2s
Operating temperature range: -20°C to +80°C
Dimensions: 38.1mm x 12.3mm x 5.5mm

Note

Values have been obtained by applying the test system as per Fig. 1.
The RF emission measure has been obtained by connecting the spectrum analyzer directly to RX Pin 3.
Switch-on time refers to the time required by the receiver to acquire the declared characteristics from the moment power supply is applied.
Values obtained with a maximum load of 10K applied.

Device Usage In order to take advantage of the performances described in the technical specifications and to comply with the operating conditions, follow the instructions below:

Printed Circuit

The receiver must be fitted on a double-layer printed circuit, with vias to the ground planes placed approximately every 15mm.
The circuit must be properly dimensioned, especially in the antenna connection area if a radiating whip antenna is fitted (approximately 50mm radius is suggested).

50 Ohm Line

The 50 Ohm line should be as short as possible.
For 1mm thick FR4 printed circuits, it should be 1.8mm wide. For 1.6mm thick FR4 printed circuits, it should be 2.9mm wide.
Keep the line 2mm away from the ground circuit on the same side and ensure a ground circuit area is present on the opposite side.

Antenna Connection

The receiver’s antenna connection can be used as the direct connection point for a radiating whip antenna.
It can also be used to connect the central wire of a 50 Ohm coaxial cable. Make sure the braid is welded to the ground in a close point.

Antenna A whip antenna, 16.5mm long and approximately 1mm in diameter, made of brass or copper wire, must be connected to the RF input of the receiver.
Technical features are subject to change without notice. AUREL S.p.A. does not assume responsibilities for any damages caused by the device’s misuse.

AC-RX Receiver

Economic receiver with low consumption, low voltage supply and variable coil. Optimised characteristic for HCS KEELOQ decoder/encoder family.

Pin-out

$AUREL-AC-RX-Economic-Receiver-fig- $1$$

Connections

Pin 2-7-11| Ground| GND Connections: Internally connected to a single ground plate
---|---|---
Pin 3| Antenna| 50W impedence antenna connection
Pin 1-15| +V| Connection to the +5V ±0.5V supply positive pole
Pin 13| Test Point| Analog output of the demodulated signal. By connecting an oscillograph the entity and quality of the received RF signal can be seen.
Pin 14| Data Out| Receiver digital output. Apply loads over 10 KW

Technical features

| Min| Tipical| Max| Unit|
---|---|---|---|---|---
Working centre frequency| | 433.92| | MHz|
Voltage supply| 4.5| 5| 5.5| V|
Absorbed current| | 2.5| 3| mA|
RF sensitivity| | -100| | dBm| See note 1
-3 dB RF bandwidth| | ±2| | MHz|
Square wave output| | | 3| KHz|
Output low voltage| | | Gnd+0.4| V| See note 4
Output high voltage| VS – 0.4| | | V| See note 4
RF spurious emissions in antenna| | -65| | dBm| See note 2
Switch-on time| | | 2| s| See note 3
Operating temperature range| -20| | +80| °C|
Dimension| 38.1 x 12.3 x 5.5 mm|

Nota1: Values have been obtained by applying the test system as per Fig. 1.
Nota2: The RF emission measure has been obtained by connecting the spectrum analyser directly to RX Pin 3.
Nota3: By switch-on time is meant the time required by the receiver to acquire the declared characteristics from the very moment the power supply is applied.
Nota4: Values obtained with 10KΩ maximum load applied

The declared technical features have been verified by applying the following test system: $AUREL-AC-RX-Economic-Receiver-fig- $2$$

Device usage

In order to take advantage of the performances described in the technical specifications and to comply with the operating conditions which characterize the Certification, the receiver has to be fitted on a printed circuit, considering what follows:

5V Supply voltage

The receiver must be supplied by a very low voltage source, safety protected against short circuits.
Maximum voltage variations allowed: ± 0.5 V.
De-coupling, next to the receiver, by means of a minimum 100.000 pF. ceramic capacitor.

Ground

It must surround at the best the welded area of the receiver. The circuit must be double layer, with throughout vias to the ground planes, approximately each 15 mm.
It must be properly dimensioned, specially in the antenna connection area, in case a radiating whip antenna is fitted in it (an area of approximately 50 mm radius is suggested.)

50 Ohm line

It must be the shortest as possible.
1,8 mm wide for 1 mm thick FR4 printed circuits and 2,9 mm wide for 1,6 mm thick FR4 printed circuits. On the same side, it must be kept 2 mm away from the ground circuit.
On the opposite side a ground circuit area must be present.

Antenna connection

It may be utilized as the direct connection point for the radiating whip antenna.
It can bear the connection of the central wire of a 50 Ω coaxial cable. Be sure that the braid is welded to the ground in a close point.

Antenna

A whip antenna, 16,5 mm long and approximately 1 mm dia, brass or copper wire made, must be connected to the RF input of the receiver.
The antenna body must be keep straight as much as possible and it must be free from other circuits or metal parts (5 cm minimum suggested distance.)
It can be utilized either vertical or horizontal, provided the connection point between antenna and receiver input, is surrounded by a good ground plane.
N.B: As an alternative to the a.m. antenna it is possible to utilize the whip model manufactured by Aurel (see related Data Sheet ed Application Notes). By fitting whip antennas too different from the described ones, the EC Certification is not assured.

Other components

Keep the receiver separate from all other components of the circuit (more than 5 mm).
Keep particularly far away and shielded all microprocessors and their clock circuits.
Do not fit components around the 50 Ohm line. At least keep them at 5 mm distance.
If the Antenna Connection is directly used for a radiating whip antenna connection, keep at least a 5 cm radius-free area. In case of coaxial cable connection then 5 mm radius will suffice.

Reference Rules

The AC-RX receiver is EC certified and in particular it complies with the European Rules EN 300 220-3 and EN 301 489. The equipment has been tested according to rule EN 60950 and it can be utilized inside a special insulated housing that assures compliance with the above-mentioned rule. The receiver must be supplied by a very low voltage safety source protected against short circuits The use of the receiver module is foreseen inside housings that assure the overcoming of the rule EN 61000-4-2 not directly applicable to the module itself. In particular, it is at the user’s care the insulation of the external antenna connection, and of the antenna itself since the RF output of the receiver is not built to directly bear the electrostatic charges foreseen by the a.m. rule.

Fig.3 Frequency – sensitivity plot $AUREL-AC-RX-Economic-Receiver-fig- $4$$

Technical features are subject to change without notice. AUREL S.p.A. does not assume responsibility for any damages caused by the device’s misuse.
AUR°EL S.p.A. Via Foro dei Tigli, 4 – 47015 Modigliana (FC) – ITALY Rev. A, 9-01-2003
Tel.: +390546941124
Fax : +390546941660 Pag 4 di 4
http://www.aurel.it
email : aurel@aurel.it