SVS SHR-7 Mode D'emploi page 3

UHF-Receiver module
1 Mode of Operation
The receiver module receive serial data from the corresponding transmitter, e.g. to
transmit measurement values in digital form or for the setup of alarm systems, etc.
The receiver module requires an DC voltage supply in the range of 7 to 14 V DC.
It is forbidden to modify or change component parts of the product !
The electronic components are not protected against weather conditions. Therefore,
it should not be used in the exterior without taking necessary precautions.
The cable connections should not be longer than 1 m.
It should be noted that for applications that could put human life at
risk, by using radio connection there is always present a potential
hazard due to extraneous disturbances.
The Operating Instructions need to be followed at all times.
2 Description
The Receiver Module SHR-7 receives and demodulates the transmitter signal and
forwards it to the evaluation circuit (not included in this module). The receiver add-
on board layout allows adapting to a maximum range of different uses and
applications.
To avoid that unwanted signals with different frequencies are evaluated, an input
frequency filter circuit is used, which also contributes to a high input sensitivity. This
guarantees a disturbance free operation as much as possible.
The Receiver Module can be used within the EU and Switzerland without additional
registration permits or fees.
3 Range of operation
The system is designed for large operating ranges up to hundreds of meters and
even obstructing walls or steel reinforced constructions can be penetrated.
The range may be reduced for the following reasons:
• Buildings, vegetation or any other objects will substantially reduce the operating
range.
• The distance between the antenna and the human body or other conducting
objects (e.g. Earth) may influence the working range.
• "Background electrical noise" could be relatively high so that the signal-to-noise-
ratio decreases and therewith the range.
Also other devices, with similar operating frequency, located within the
neighbourhood may disturb the receiver.
• Operating the receiver next to inadequately shielded electronic boards or other
devices (e.g. PC's) that produce electromagnetic radiation, can substantially
reduce the range of operation and could result in an apparent intermittent
operation.
• It is forbidden to modify, change or manipulate component parts of the
product!
4 Operation
For the location of the receiver, select a place which is not shielded by conducting
objects and allows an ideal orientation of the antenna, which is parallel to the
transmitter antenna.
Because the circuit board is open, make sure that no static
discharges occur and that the components will not be damaged!
Fig. 1: Receiver Module SHR-7 with connection layout
)
Operating Instructions (GB
Power Supply: Connect the voltage supply (7...14 V) between the pins GND (0 V)
and +U (pay attention to the correct +/- connection)!
Caution:
A greater voltage could damage the radio input circuits!
Data Output: Transistor output with 15 kOhm pull-up resistor with +5V internally
controlled. The data sequence received from the transmitter at the receiver output is
inverted. This needs to be taken into account when processing the data.
Clocked Operation: When shipped, the receiver module is set to continuous
operation and requires app. 6.5 mA. For applications that require less current
supply, the module can be operated in a clocked modus. For this, the user just
needs to remove the resistor "clocked operation" shown in Fig. 1. The mean current
supply is then .25 mA. The user should be aware that the transmitter has to be
sending for at least 1.3 seconds for the receiver to safely detect the transmitter
signal and the data be evaluated.
Antenna: The receiver module is shipped without an antenna (see Chap. 5).
5 Antenna Connection
A wire of app. 17,3 cm length can be used as an antenna if soldered directly at the
output „ANT". However, the best receiving characteristics can be achieved with the
Multiflex Antenna, Id.-Nr. 00069.00. If the antenna needs to be installed at a
different location, the user can use an extension with a 50-Ohm coaxial cable (see
fig. 2)
The antenna should be positioned vertically to the board or to any
other device and should not be screened by conducting objects
and should be parallel to the transmitter antenna.
grounded plane
ANT
GND-ANT
< 10 m
Fig. 2: Connection of an antenna extension cable
6 Technical Details
Frequency :
LF-Bandwidth :
Demodulation :
Evaluation sensitivity :
Operating Voltage :
Current :
Ambient temperature :
Storage temperature :
Dimensions :
Connectors :
Antenna
433,920 MHz
ca. 20 Hz to 2 kHz
ASK
tip. < -105 dBm
7 to 14 V DC
6,5 mA (clocked app. 0,25 mA)
-20 °C to +65 °C
-40 °C to +85 °C
45,2 (32,6) x 23,1 x 7 mm
Pin panel with separation of 2,54mm