433MHz Narrow Band Radio Transmitter & Receivers
Transmitter Connection Diagram
Frequency Adj.
CV1
CV1
Receiver Connection Diagram
Discr.
Quasar
UHFNarrow Band Radio Transmitter
CV2
Frequency Adj.
RV1
Squelch Level
Quasar
UHFNarrow Band Radio Receiver
1
2
3
4
5
6
7
1
2
3
4
5
6
7
8
9
Figure 1: Narrow Band Transmitter
Figure 2: Narrow Band Receiver
Pin Description:
GND
(pin 1)
Ground connection, connected to pins 4 and 5.
MODULATION INPUT
(pin 2)
A digital data signal (0-5V) or an analogue signal
(3V
P-P
) directly coupled with a 0.1 – 0.22µF
capacitor must be directly connected to this pin. A
st
1 order low-pass filter is used internally and so
there is a resulting frequency deviation of
±7
KHz.
Note:
a DC bias of 2.5 V is present on this pin.
CV1 must be adjusted to obtain the centre
channel frequency with the modulation input
terminal disconnected.
UNCONNECTED
(pin 3)
Extra SIL pin for additional mechanical retention.
GND
(pin 4)
Ground connection, connected to pins 1 and 5.
GND
(pin 5)
Ground connection, connected to pins 1 and 4
RF OUT
(pin 6)
Antenna output
V
CC
(pin 7)
+Ve supply pin. Operation from a 5V supply able
to source 22mA.
Pin Description:
V
CC
(pin 1)
+Ve supply pin. Operation from a 5V supply able
to source 14mA. Connected to pin 9.
GND
(pin 2)
Ground connection, connected to pins 4 and 5.
RF IN
(pin 3)
Antenna input.
GND
(pin 4)
Ground connection, connected to pins 2 and 5.
GND
(pin 5)
Ground connection, connected to pins 2 and 4.
RSSI
(pin 6)
The Received Signal Strength Indicator provides a
DC output voltage proportional to the RF input
signal
AF OUT
(pin 7)
Analogue signal output. A 100nF series capacitor
is required.
DATA OUT
(pin 8)
CMOS compatible output. This may be used to
drive external decoders.
V
CC
(pin 9)
+Ve supply pin. Operation from a 5V supply able
to source 14mA. Connected to pin 1.
DS337_2
June 01
©
2001 REG No 277 4001, England.
Page 4
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