433MHz Narrow Band Radio Transmitter & Receivers
Transmitter Connection Diagram
Receiver Connection Diagram
Frequency Adj.
Discr.
CV1
CV1
Quasar
Squelch Level
Frequency Adj.
UHFNarrow Band Radio Transmitter
RV1
CV2
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:
Pin Description:
VCC (pin 1)
GND (pin 1)
+Ve supply pin. Operation from a 5V supply able
to source 14mA. Connected to pin 9.
Ground connection, connected to pins 4 and 5.
MODULATION INPUT (pin 2)
GND (pin 2)
Ground connection, connected to pins 4 and 5.
A digital data signal (0-5V) or an analogue signal
(3VP-P) directly coupled with a 0.1 – 0.22mF
capacitor must be directly connected to this pin. A
1st 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.
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.
UNCONNECTED (pin 3)
Extra SIL pin for additional mechanical retention.
RSSI (pin 6)
The Received Signal Strength Indicator provides a
DC output voltage proportional to the RF input
signal
GND (pin 4)
Ground connection, connected to pins 1 and 5.
GND (pin 5)
Ground connection, connected to pins 1 and 4
AF OUT (pin 7)
Analogue signal output. A 100nF series capacitor
is required.
RF OUT (pin 6)
Antenna output
DATA OUT (pin 8)
CMOS compatible output. This may be used to
drive external decoders.
VCC (pin 7)
+Ve supply pin. Operation from a 5V supply able
to source 22mA.
VCC (pin 9)
+Ve supply pin. Operation from a 5V supply able
to source 14mA. Connected to pin 1.
DS337_2
June 01
Ó 2001 REG No 277 4001, England.
Page 4
RFSOLUTIONS [ RFSOLUTIONS.LTD ]
