rx2-433-40-5v Radiometrix Ltd, rx2-433-40-5v Datasheet - Page 3

• Manufacturer Part Number: rx2-433-40-5v
• Description: The Tx2 And Rx2 Data Link Modules Are A Miniature Pcb Mounting Uhf Radio Transmitter And Receiver Pair Which Enable The Simple Implementation Of A Data Link At Upto 160 Kbit/s At Distances Upto 75 Metres Inbuilding And 300 Metres Open Ground.
• Manufacturer: Radiometrix Ltd

RX2 receiver:
CD
The Carrier Detect may be used to drive an external PNP transistor to obtain a logic level carrier detect
signal, see test circuit. If not required it should be connected to pin 5 (Vcc).
0 Volt
Supply ground connection, connected to pin 1 and screen.
Vcc
+ve supply pin. +3.0V to +6.0V @ <17mA . The supply must be clean < 2mV
coupling capacitor and 10
AF
This is a buffered and filtered analogue output from the FM demodulator. It has a standing DC bias of
1.2V and 400mV
impedance should be > 2k
RXD
This digital output from the internal data slicer is a squared version of the signal on pin 6 (AF). It may
be used to drive external decoders. The data is true data, i.e. as fed to the transmitter. Load impedance
should be > 1k
Radiometrix Ltd., TX2 & RX2 Data Sheet
Pin description
RF in
50
DC isolate internally. (see antenna
section for suggested antenna/feeds).
RF GND
RF ground pin, internally connected to
the module screen and pin 4 (0V). This
pin should be connected to the RF
return path (e.g. coax braid, main
PCB ground plane etc.)
RF input from the antenna, it is
RF in (1)
RF gnd (2)
(pin 3)
(pin 4)
(pin 5)
(pin 6)
(pin 7)
(pin 1)
(pin 2)
433 MHz band
pass filter
and < 1nF
P-P
base band signal. It is useful as a test point or to drive linear decoders. Load
pre -
amplifier
series resistor is recommended if a clean supply is not available.
and < 100pF.
SAW band
pass filter
Fig. 3: RX2 block diagram
1st Local oscillator
418 MHz SAW-
controlled
1 mixer
st
2 mixer
IF amlpifier
demodulator
2 local
oscillator
15.82 MHz
nd
nd
Fig. 4: physical dimensions
AF
91 kHz
buffer
P-P
ripple. A 10 F de-
adaptive data slicer
2 F
+
-
Data out (7)
0 VOLT (4)
Vcc (5)
CD (3)
AF (6)
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