433MHz Narrow Band Radio Transmitter & Receivers
Features
•
Miniature Module
•
FM Narrow Band Modulation
•
Optimal Range 400m
•
Operates Within 433 Licence Free Band
•
34 Channels Available
•
Single Supply Voltage
Applications
•
In Vehicle Telemetry Systems
•
Wireless Networking
•
Domestic And Commercial Wireless
Systems
Security
•
Panic Attack Facility
Transmitter
•
Analogue And Digital Inputs
•
10mw RF Output Power (100mw Optional)
•
Narrow Band Crystal Stabilised
•
Small Form Factor
General Description
The QBT37-XXX and QBR37-XXX are miniature
narrow band transmitter and receiver UHF radio
modules, which enable the implementation of a
simple telemetry link at data rates up to 20Kbits/s.
Available for operation between 433.075 and
434.725 MHz in 50KHz steps these modules give
the possibility of 34 different frequency channels
and are able to transmit at distances of up to
400m.
Receiver
•
Data & Af Out
•
CD Implemented On Data Output
•
RSSI Output
•
Selective Ceramic If Filters
The QBT37-XXX and QBR37-XXX modules will
suit one-to-one and multi-node wireless links in
applications including building and car security,
remote industrial process monitoring and
computer networking. Because of their small size
and low power requirements, both modules are
ideal for use in portable battery powered wireless
applications
DS337_2
June 01
©
2001 REG No 277 4001, England.
Page 1
433MHz Narrow Band Radio Transmitter & Receivers
Absolute Maximum Ratings: Transmitter
Operating temperature:
Storage temperature:
Supply Voltage (pin 3)
Data input (pin 5)
-10°C to +55°C
-40°C to +100°C
10V
10V
Electrical Characteristics: Transmitter
pin
DC LEVELS
Supply voltage
Current & RF POWER
Supply current @ V
CC
= 5V (data low/high)
RF output power @ V
CC
= 5V
RF & Data
Channel separation
Max Modulation frequency
2
nd
harmonic
Harmonics @ > 1GHz
Initial frequency accuracy
Overall frequency accuracy
FM deviation (±)
Modulation bandwidth @ -3dB
Modulation distortion (THD)
Power up time to full RF
Data rate
Data pulse width
Note 1:
measured into a 50Ω impedance
22
10
mA
mW
1
1
min.
4.5
typ.
5.0
max.
5.5
units
Volts
notes
50
10
66
46
1
5
7
10
10
20000
10000
KHz
KHz
dBc
dBc
KHz
KHz
KHz
KHz
%
µs
bits/s
µs
1
1
50
DS337_2
June 01
©
2001 REG No 277 4001, England.
Page 2
433MHz Narrow Band Radio Transmitter & Receivers
Absolute Maximum Ratings: Receiver
Operating temperature:
Storage temperature:
Supply Voltage
Data input
-10°C to +55°C
-40°C to +100°C
10V
10V
Electrical Characteristics: Receiver
pin
DC LEVELS
Supply voltage
Supply current
Supply ripple
Data output high
Data output low
RF
RF sensitivity
IF Bandwidth
Initial frequency accuracy
Max R.F. input
E.M.C.
Spurious responses upto 1GHz
LO leakage, conducted
LO leakage, radiated
DYNAMIC TIMING
Power up to stable data
(With RF signal
present
Signal to stable data
(With power supply
already on)
Mark:space ratio
Bit rate
min.
typ.
5
14
-
=>4.5
<= 0.5
max.
units
V
mA
mV
P-P
V
V
notes
-
10
-107
40
1
-20
DBm
KHz
KHz
DBm
36
57
57
dB
dBm
dBm
5
mS
3
mS
50
20
20000
%
bps
DS337_2
June 01
©
2001 REG No 277 4001, England.
Page 3
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
433MHz Narrow Band Radio Transmitter & Receivers
Functional Description
The QBT37-XXX FM narrow band transmitter
module consists of a low frequency directly
modulated crystal oscillator and multiplier and
filter circuits. Baseband data directly modulates
the low frequency crystal oscillator, the output of
which is applied to the first of three frequency
multipliers to achieve the final output frequency
after being processed by interstage band pass
filter circuits.
The QBR37-XXX FM narrow band receiver
module uses the single conversion super-het
principle. The applied RF signal is amplified and
applied to the RF mixer. Using a 10.7 MHz IF
frequency at 50KHz channel spacing enables use
of ceramic filters to provide good adjacent channel
rejection. Baseband demodulation is recovered
from this IF and applied to a squelch circuit.
Therefore, data is only available when a RF signal
is present.
Frequency Channels
The QBT37-XXX and QBR37-XXX are available
in 34 discrete frequency channels from 433.075 to
434.725 MHz in 50KHz steps. The table below
shows the list of possible frequency channels.
+5V
100k
Ω
10k
Ω
Ω
X1
Q1
CV1.
FREQ.
ADJ.
Q2
Q3
Q4
CH.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
FREQ/MHz
433.075
433.125
433.175
433.225
433.275
433.325
433.375
433.425
433.475
433.525
433.575
433.625
433.675
433.725
433.775
433.825
433.875
CH.
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
FREQ/MHz
433.925
433.975
434.025
434.075 (1)
434.125
434.175
434.225
434.275
434.325 (1)
434.375
434.425
434.475
434.525 (1)
434.575
434.625
434.675
434.725
100k
Ω
470pF
D1
15k
Ω
(1) Stock Item
AUX
2
3
4
5
6
7
1
2.5VDC
+5V
0.1
µ
F
3V
ANALOGUE MODULATION
RF OUTPUT
Z = 50Ω
Ω
5V
DIGITAL MODULATION
0V
+5V
IC1
+5V
Q1
X1
Q2
CV2
FREQ.
Q3
XF1
XF2
22KΩ
Ω
1
2
3
4
5
6
7
8
9
+5V RF
ANT 50Ω
Ω
100mV
RSSI
+5V IF
0.1
µ
F
ANALOGUE OUTPUT
5V
DIGITAL OUTPUT
20Hz - 10KHz
0V
Figure 3: Narrow Band Transmitter and
Receiver Block Diagrams
DS337_2
June 01
©
2001 REG No 277 4001, England.
Page 5
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