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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
(c) 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) -10C to +55C -40C to +100C 10V 10V
Electrical Characteristics: Transmitter
pin DC LEVELS Supply voltage Current & RF POWER Supply current @ VCC = 5V (data low/high) RF output power @ VCC = 5V RF & Data Channel separation Max Modulation frequency 2nd 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 50 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 % s bits/s s 1 1
50
DS337_2
June 01
(c) 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 -10C to +55C -40C to +100C 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 mVP-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
(c) 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 (3VP-P) directly coupled with a 0.1 - 0.22F 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. 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 VCC (pin 7) +Ve supply pin. Operation from a 5V supply able to source 22mA.
Pin Description:
VCC (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. VCC (pin 9) +Ve supply pin. Operation from a 5V supply able to source 14mA. Connected to pin 1.
DS337_2
June 01
(c) 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 10k
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
470pF
D1
15k
(1) Stock Item
AUX 2 3 4 5 6 7
1
2.5VDC
+5V
0.1 F 3V ANALOGUE MODULATION
RF OUTPUT Z = 50
5V DIGITAL MODULATION 0V
+5V
IC1 +5V
Q1
X1 Q2 CV2 FREQ. Q3
XF1
XF2
22K
1
2
3
4
5
6
7
8
9
+5V RF
ANT 50 100mV RSSI
+5V IF
0.1 F ANALOGUE OUTPUT
5V DIGITAL OUTPUT 20Hz - 10KHz 0V
Figure 3: Narrow Band Transmitter and Receiver Block Diagrams
DS337_2
June 01
(c) 2001 REG No 277 4001, England.
Page 5
433MHz Narrow Band Radio Transmitter & Receivers
Antenna Design
The design and positioning of the antenna is as crucial as the module performance itself in achieving a good wireless system range. The following will assist the designer in maximising system performance. The antenna should be kept as far away from sources of electrical interference as physically possible. If necessary, additional power line decoupling capacitors should be placed close to the module. The antenna `hot end' should be kept clear of any objects, especially any metal as this can severely restrict the efficiency of the antenna to receive power. Any earth planes restricting the radiation path to the antenna will also have the same effect. Best range is achieved with either a straight piece of wire, rod or PCB track @ 1/4 wavelength (15.5cm @ 433.92MHz). Further range may be achieved if the 1/4 wave antenna is placed perpendicular in the middle of a solid earth plane measuring at least 16cm radius. In this case, the antenna should be connected to the module via some 50 ohm characteristic impedance coax
Application Circuit
The application circuits show how the FM narrow band transmitter and receiver modules can easily be integrated into a system to form a wireless link.
ANTENNA +5V +5V Quasar UHFNarrow Band Radio Transmitter 1 2 3 4 5 6 7
1 2 3 4 5 6 7 8 9
A0 A1 A2 A3 A4 A5 A6 A7 VSS HT12E
VDD DOUT OSC1 OSC2 TE\ AD11 AD10 AD9 AD8
18 17 16 15 14 13 12 11 10 R OSC
ANTENNA +5V +5V
1 2 3 4 5 6 7 8 9
A0 A1 A2 A3 A4 A5 A6 A7 VSS HT12D
VDD VT OSC1 OSC2 DIN D11 D10 D9 D8
18 17 16 15 14 13 12 11 10 DATA OUT 4 DATA OUT 3 DATA OUT 2 DATA OUT 1 ROSC
1K5
Quasar UHF Narrow Band Radio Receiver 1 2 3 4 5 6 7 8 9
Helical Antenna
RF
Figure 5: FM Narrow Band Transmitter & Receiver Application Circuits
34mm @ 433MHz 17 turns equally spaced = 5mm (inside)
Whip Antenna
RF 15.5cm @ 433MHz
Figure 4: Antenna Configurations To Be Used With The FM Narrow Band Transmitter & Receiver Modules
DS337_2
June 01
(c) 2001 REG No 277 4001, England.
Page 6
433MHz Narrow Band Radio Transmitter & Receivers
Mechanical Dimensions
41.9mm 7mm
11.68mm
Quasar UHFNarrow Band Radio Transmitter
1
2
3
4
17.78mm
5
6
5.08mm
7
2.54mm
pin Dia is max 0.75mm. recommended mounting hole diameter is 1mm
50mm 7.5mm
21mm
Quasar UHFNarrow Band Radio Receiver
6.5mm pin spacing 2.54mm 6.5mm
1
2
3
4
17.78mm
5
6
7
8
9
Figure 6: FM Narrow Band Transmitter and Receiver
Ordering Information
Standard Product; Part No QBT37-434.075 QBT37-434.325 QBT37-434.525 QBR37-434.075 QBR37-434.325 QBR37-434.525 Description SIL Narrow Band Transmitter SIL Narrow Band Transmitter SIL Narrow Band Transmitter SIL Narrow Band Receiver SIL Narrow Band Receiver SIL Narrow Band Receiver
Custom Product; Any frequency between 433.075MHz - 434.725MHz is available in steps of 50KHz. This gives 34 channels of module possibility. Please consult our sales department for further information. R F Solutions Ltd., Unit 21, Cliffe Industrial Estate, South Street, Lewes, E. Sussex. BN8 6JL, England Tel: +44 (0)1273 898 000 Email : sales@rfsolutions.co.uk Fax: +44 (0)1273 480 661 http://www.rfsolutions.co.uk
Information contained in this document is believed to be accurate , however no representation or warranty is given and no liability is assumed by R.F. Solutions Ltd. With respect to the accuracy of such information. Use of R.F.Solutions as critical components in life support systems is not authorised except with express written approval from R.F.Solutions Ltd.
DS337_2
June 01
(c) 2001 REG No 277 4001, England.
Page 7

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