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FM 433MHz Narrow Band
T7 / R7 T7G / R7G
Features * Miniature SIL Package * FM Narrow Band * Fully Shielded * Narrow Band Crystal Stabilised * Data Rates Up To 20 Kbits/S * En 300-220 Compliant * Data & AF Out * CD Implemented On Data Output * RSSI Output * Selective Ceramic IF Filters T7/R7 Modules * Wide Operating Voltage (2.2 - 10 Vdc). * Optimal Range 600 metres T7G/R7G Modules * 3 or 5 Volt Operating Voltage * 3 Channels available from Stock * Optimal Range 1,000 metres Applications * Telemetry Systems * Wireless Networking * Domestic And Commercial
Systems
Wireless Security
* *
Panic Attack Facility Remote Control For Cranes Etc
General Description
The T7/R7 series 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. These narrow band UHF radio modules provide a very high RF performance for general purpose applications. The transmitter modules have a power output of up to 25mW. When combined with a very high receiver sensitivity these modules obtain a very high performance of range and reliability within the 433MHz band. Available for operation between 433.075 and 434.725 MHz in 25KHz steps there are currently 3 different frequency channels available from stock. (others available to special order) The T7G and R7G genesis modules represent the latest generation of narrow band transmitters. They retain the same industry standard footprints and are fully compatible with the T7 and R7 modules to enable incorporation into both new and existing designs. The improved sensitivity of the R7G enables a range of up to 1Km when used with the T7G modules.
DS307-7 Oct 05
(c)2004 REG No 277 4001, England.
Page 1
FM 433MHz Narrow Band
Frequency Channels
T7 / R7 These modules are available at 4345.075MHz only.
T7 / R7 T7G / R7G
T7G / R7G These modules 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.
CH. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 (1) Stock Item (2) Future Development
FREQ/MHz 433.075(2) 433.125(2) 433.175(2) 433.225(2) 433.275(2) 433.325(2) 433.375(2) 433.425(2) 433.475(2) 433.525(2) 433.575(2) 433.625(2) 433.675(2) 433.725(2) 433.775(2) 433.825(2) 433.875(2)
CH. 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
FREQ/MHz 433.925(2) 433.975(2) 434.025(2) 434.075 (1) 434.125(2) 434.175(2) 434.225(1) 434.275(2) 434.325 (2) 434.375(2) 434.425(2) 434.475(2) 434.525 (1) 434.575(2) 434.625(2) 434.675(2) 434.725(2)
DS307-7 Oct 05
(c)2004 REG No 277 4001, England.
Page 2
FM 433MHz Narrow Band
Absolute Maximum Ratings: Transmitter (all voltage versions)
T7 Operating Temperature Storage Temperature Supply Voltage Data Input Min. -25C -40C Max. +55C +100C 12V 10V Min. -10C -40C T7G
T7 / R7 T7G / R7G
Max. +55C +100C 5.5V 5.5V
Electrical Characteristics: Transmitter
Min. DC Levels Supply (5V variants) Supply (3V variants) Current & RF Power Supply current @ VCC = 5V RF output power @ VCC = 5V Supply current @ VCC = 3V RF output power @ VCC = 3V RF & Data (All Variants) 2nd harmonic -60 -40 Harmonics @ > -60 -50 1GHz Initial frequency +/-25 +/-25 accuracy Frequency accuracy +/-30 over full temp range Modulation 20 30 bandwidth @ -3dB Power up time to full 5 5 RF Data rate 20 Data pulse width 50 50 Notes 1. Measured into a 50 impedance. 2. The limit for the European spec EN 300 220 is -36dBm 3. A +/-2.5KHz Deviation on the RF carrier is also available Part No T7-434-075 T7G-434-075 T7G-434-075-3V T7G-434-225 T7G-434-525 T7G-434-525-3V
DS307-7 Oct 05
T7 Typ. 5.0 -
Max. 12.0 -
Min. 4.5 2.2
T7G Typ. 5.0 3.0
Max. 5.5 4.0
Units
Pin
Notes
2.2 -
Volts Volts
3 3
7 3 -
24 25 22 13
mA mW mA mW
3 2 3 2
1 1 1 1
dBm dBm Hz 27 KHz KHz ms 20 kbits/s s
2 2
3
Description SIL Transmitter 434.075MHz SIL Transmitter 434.075MHz SIL Transmitter 434.075MHz, 3 Volt version SIL Transmitter 434.225MHz SIL Transmitter 434.525MHz SIL Transmitter 434.525MHz, 3 Volt version
Page 3
(c)2004 REG No 277 4001, England.
FM 433MHz Narrow Band
Absolute Maximum Ratings: Receiver
R7 Operating Temperature Storage Temperature Supply Voltage RF Input Min. -10C -40C Max. +55C +100C 7V +20dBm (100mW) Min. -10C -40C R7G
T7 / R7 T7G / R7G
Max. +55C +100C 5.5V +10dBm (10mW)
Note: Receiver modules with operating temperatures from -40C to +80C are also available
Electrical Characteristics: Receiver
Min. 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 up to 1GHz LO leakage, conducted LO leakage, radiated Image rejection DYNAMIC TIMING Power up to stable data (With RF signal present) Signal to stable data (With PSU already on) Power up to valid RSSI ( With RF signal Present ) Mark:space ratio Bit rate 4.5 R7 Typ. 5 6 =>4.5 <=0.5 -113 +/-27 +/-100 20 <60 <60 <60 63 Max. 5.5 7 10 Min. 4.5 R7G Typ. 5 11 =>4.0 <=0.5 -117 +/-27 +/-25 10 <60 <60 <60 35 Max. 5.5 10 Units Notes
V mA mVP-P V V dBm KHz Hz dBm dB dBm dBm dB 2
18 2.5 3 50 100
23 5 5 20000 100
110 1 2.5 50 20000 3.5
mS mS mS % Bps
1 1 1 3
Notes 1. Timings are to be confirmed. 2. For R7G: For 12dB SINAD from the AF output 3. Note 1Hz = 2 bps Part No R7-434-075 R7G-434-075 R7G-434-225 R7G-434-525 Description SIL Receiver 434.075MHz SIL Receiver 434.075MHz SIL Receiver 434.075MHz SIL Receiver 434.075MHz
DS307-7 Oct 05
(c)2004 REG No 277 4001, England.
Page 4
FM 433MHz Narrow Band
Transmitter Connection Diagram
T7 / R7 T7G / R7G
Receiver Connection Diagram
T7
R7
1
2
3
4
5
12
34567
Figure 1: Narrow Band T7 / T7G Transmitters
Figure 2: Narrow Band R7 / R7G Receivers
Pin Description:
RF GND (pin 1) RF ground pin, internally connected to pin 4 (0v). This pin should ideally be connected to the nearest ground plane ( e.g coax braid, main PCB ground plane etc. ).
Pin Description:
RF IN ( pin 1) 50 Ohm RF input from antenna, connect using shortest possible route. This input is isolated from the internal circuit using the air gap of the front end SAW RF filter. RF GND (pin 2) RF Ground connection, preferably connected to a solid ground plane. RSSI / Carrier Detect (pin 3) The Received Signal Strength Indicator provides a DC output voltage proportional to the RF input signal. The amplitude of the RSSI voltage increases with increasing RF signal strength. A simple transistor interface can yield a carrier detect logic output. GND (pin 4) Connect to power supply ground. VCC (pin 5) +Ve supply pin. Operation from a 5V supply able to source 10mA at less than 10mV p-p ripple. AF (pin 6) Audio frequency output ( max 40microA source ) DATA OUT (pin 7) CMOS compatible output. This may be used to drive external decoders. To reduce any noise on this output add a 56pF cap from this pin to GND.
RF OUT (pin 2) 50 Ohm RF antenna output. To achieve best results, the antenna impedance must match that of the module. Vcc (pin 3) +Ve supply pin. The module will generate RF when Vcc is present. GND (pin 4) Supply and data ground connection, connected to pin 1. Data IN (pin 5) This input has an impedance of 47K Ohms and should ideally be driven by a CMOS logic drive or compatible. The drive circuitry should be supplied with the same supply voltage as the TX module.
DS307-7 Oct 05
(c)2004 REG No 277 4001, England.
Page 5
FM 433MHz Narrow Band
Application Information 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.
+5V
T7 / R7 T7G / R7G
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
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
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 R7 / GR7 12 34567
ANTENNA +5V +5V
T7 / GT7 1 2 3 4 5
1 2 3 4 5 6 7 8
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 ROSC
Helical Antenna
RF
9
34mm @ 433MHz 17 turns equally spaced = 5mm (inside)
Figure 5: FM Narrow Band Transmitter & Receiver Application Circuits
Whip Antenna
RF 15.5cm @ 433MHz
Figure 4: Antenna Configurations To Be Used With The FM Narrow Band Transmitter & Receiver Modules
DS307-7 Oct 05
(c)2004 REG No 277 4001, England.
Page 6
FM 433MHz Narrow Band
Reducing Power to 10mW
If the T7G transmitter will be used with an efficient antenna in countries where only 10mW radiated power is allowed, then a simple resistive network on the output of the module will attenuate the power down to this level.
Circuit Diagram
T7 / R7 T7G / R7G
RSSI Values
The R7 / R7G receiver RSSI outputs provide a DC output proportional to the RF signal. The table below shows the typical RSSI value depending on the Signal strength. RF Signal Strength/dBm
-130
R7 (V)
1.03 1.06 1.16 1.34 1.59 1.78 1.81 1.81 2.17 2.45 2.52 2.52
GR7 (V)
1.25 1.32 1.46 1.69 1.96 2.2 2.47 2.5 2.5 -
T7B
12 TO ANTENNA 3 4 5
-120 -110 -100 -90 -80 -70 -60
22ohm
220 ohm
220 ohm
When laying out this network, keep all tracks as short as possible, especially ground paths and use 50 ohm track impedances when connecting to and from this network. This impedance can be realised on 1.6mm FR4 pcb by using a track width of 2.5mm.
-50 -40 -30 -20
Notice that the region between -80 to -60 is with the receiver agc operating. If required, a receiver version with agc disabled can be provided as a factory Pre-set option. This would linear-rise the RSSI curve.
Mechanical Dimensions
3.0 mm 31.5 mm
48mm 8.30mm 4.65mm
CE
10.5 mm
T7 / T7G
17mm
R7 / R7G pin spacing 2.54mm
1.5mm 1 2 20.32 mm 3 4 5
3.5mm
12 30.48mm 34567
Pin spacings 2.54 mm Pin Dia 0.5mm All dimensions +/- 0.5mm
Pin spacings 2.54 mm Pin Dia 0.5mm pin 1 is 2.33mm from edge of module All dimensions +/- 0.5mm
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.
DS307-7 Oct 05
(c)2004 REG No 277 4001, England.
Page 7

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