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Radio Transmitter & Receiver Modules
T6 / R6
Features
* * * * * *
Miniature SIL Package Fully Shielded Data Rates Up To 64kbits/S Range upto 200 Metres Single Supply Voltage Industry Pin Compatible
QFMT6-XXX
Description
The QFMT6 AND QFMR6 miniature UHF radio modules enable the implementation of a reliable telemetry link at data rates of up to 64 Kbits/s. The QFMT6 is based on a classical phase lock loop using a crystal reference oscillator. This results in an accurately controlled RF output in the frequency domain. A significant advantage of this is that narrow filtering can then be used in the receiver, which results in high interference immunity. In addition, the modules are fitted with an on-board voltage regulator which enhances performance from improved supply filtering and also ensures a constant RF output level. The QFMR6 is based on the single conversion superhet principle utilising a crystal based phase lock loop for accurate generation of the local oscillator. This allows use of high Q bandpass filters resulting in good adjacent channel selectivity and high interference immunity. The QFMT6 and QFMR6 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 its small size and low power requirements, these modules are ideal for use in portable battery powered wireless applications. These modules may be used within areas of high interference, or `radio traffic'. Due to the design, they provide a highly reliable radio link.
* * * * * * *
Temp range -20c + 55c European Versions; 868.4 MHz for 10% duty cycle band 869.85 MHz for 100% duty cycle band American version; 915.0MHz Bandwidth Efficient PLL technology
QFMR6-XXX
* * * * * * * * * * * *
Single conversion FM superheteodyne using RF SAW and ceramic IF filtering at 10.7 MHz Image rejection 60dB Analogue, digital outputs Signal strength output (RSSI) Incorporates AGC for improved dynamic range Dynamic range better than 120dB Single 5V supply
Applications
Vehicle Alarm Systems Remote Gate Controls Garage Door Openers Domestic And Commercial Security
DS306-3
May 03
2003 REG No 277 4001, England.
Page 1
Radio Transmitter & Receiver Modules
Connection Diagram / Dimensions QFMT6 Transmitter
3.4 mm 31.5 mm
T6 / R6
CE
10 mm
T6
(Pin spacings 2.54 mm) 19.57 mm 1 2 3 4 5
1.5mm
Pin Descriptions
RF GND (pin 1) RF Ground pin is internally connected to pin 4 (0V) This pin should ideally be connected to the nearest ground plane (e.g. coax braid, main PCB ground plate etc.) RF OUT (pin 2) 50 RF antenna output. To achieve best results the antenna impedance must match that of the module. VCC (pin 3) +Ve supply pin (3.0 to 9.0 volts). The module will generate RF when VCC is present. It is strongly recommended that a 100nF capacitor decouples the supply rail as close as possible to this pin. GND (pin 4) Supply and data ground connection, connected to pin 1. Data IN (pin 5) This input has an impedance of 47K 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.
Ordering Information: Part No
T6-8684-20 T6-8684-64 T6-86985 T6-915-20 T6-915-64
Description
SIL Transmitter 868.4MHz 20Kbps Data rate SIL Transmitter 868.4MHz 64Kbps Data rate SIL Transmitter 869.85 MHz SIL Transmitter 915.0 MHz 20Kbps Data rate SIL Transmitter 915.0 MHz 64Kbps Data rate
DS306-3
May 03
2003 REG No 277 4001, England.
Page 2
Radio Transmitter & Receiver Modules
Absolute Maximum Ratings: Transmitter QFMT6
Operating temperature: -20C to +55C Storage temperature: -40C to +100C Supply Voltage (pin 3) Data input (pin 5) 10V 10V
T6 / R6
Electrical Characteristics: Transmitter QFMT6
Pin Supply voltage
Current & RF POWER
Min. 2.3
typ. 5.0
Max. 10.0
units Volts
notes
3
868.40 MHz Supply current @ VCC = 5V RF power
RF & Data
3 2
7 1 -50 -50 10 35 10 100 15 64000
mA mW dBm dBm KHz KHz mS bits/s s
1 1 2 2
2nd harmonic Harmonics @ > 1GHz Initial frequency accuracy Modulation bandwidth @ -3dB Power up time to full RF Data rate Data pulse width
Notes 1. Measured into a 50 impedance a 10mW version is planned for production 2. The limit for the European spec EN 300 220 is -36dBm
DS306-3
May 03
2003 REG No 277 4001, England.
Page 3
Radio Transmitter & Receiver Modules
Connection Diagram / Dimensions QFMR6 Receiver
T6 / R6
4.5 mm 49.05 mm
CE
17 mm
R6
(Pin spacings 2.54 mm)
1.5mm 31 mm
1
2
34
56
7
Pin Descriptions
RF IN (pin 1) 50 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, preferable connected to a solid 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 source6mA at less than Vp-p ripple. AF (pin 6) Audio frequency output. (max 40uA 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.
Ordering Information:
Part No R6-8684-20 R6-8684-64 R6-86985 R6-915-20 R6-915-64 Description SIL Receiver 868.40 MHz 20Kbps Data rate SIL Receiver 868.40 MHz 64Kbps Data rate SIL Receiver 869.85 MHz SIL Receiver 915 MHz 20Kbps Data rate SIL Receiver 915 MHz 64Kbps Data rate
DS306-3
May 03
2003 REG No 277 4001, England.
Page 4
Radio Transmitter & Receiver Modules
Absolute Maximum Ratings: Receiver QFMR6
Operating temperature: -10C to +55C -40C to 80C option available Storage temperature: -40C to +100C Supply Voltage (pin 5) RF Input (pin 1) 7V +20dBm (100mw)
T6 / R6
Electrical Characteristics: Receiver QFMR6 (20 Kbits/s version)
min. Supply voltage Supply current Supply ripple Data output high Data output low
RF
typ. 5.0 6 =>4.0 <=0.5 -103 230 10 20 <60 <60 <60 60
Max. 5.5 10
units V MA mVp-p V V dBm KHz KHz dBm dB dBm dBm dB
notes
4.5
RF sensitivity IF Bandwidth Initial signal accuracy Max. RF input
E.M.C
1
Spurious responses upto 1GHz LO leakage, conducted LO leakage, radiated Image rejection Dynamic Timings Power up to stable data (With RF signal present) Signal to stable data (With power supply already on) Power up to valid RSSI (With RF signal present) Mark : space ratio Bit rate
6 5 1 50 100 20000
mS mS mS % bps
2 2 2
Notes 1. IF bandwidth available down to 27KHz. 2. Timings are to be confirmed
DS306-3
May 03
2003 REG No 277 4001, England.
Page 5
Radio Transmitter & Receiver Modules
Antenna Design
T6 / R6
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. 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.
Loop Antenna
Loop Antenna Area 600mm2 PIN 1 PIN 2 C1 C1 = 1pF @ 433MHz C1 = 1pF @ 868MHz and halve loop area
Loop Antenna: The loop antennae, is the cheapest and most compact of the three antennas. The antenna always takes up the form of a track on a PCB, the antenna consists of a feeder capacitor C1 which is connected directly to the transmit pin on the radio module, and a loop track which is grounded. This antenna gives the poorest performance of the three, and thus is essential that the tuning capacitors are adjusted for the best system performance.
Helical Antenna
RF
Helical Antenna: The helical antenna provides a more compact antenna for mobile radio systems. The antenna must be connected directly to the transmit pin of the radio module.
20mm @ 868MHz
= 5mm (inside)
Whip Antenna
PIN 1 7cm @ 868MHz
Whip Antenna: The whip antenna simply consists of a metal rod with a length of 1/4 of the wavelength of the signal which you wish to transmit. The whip must be directly connected to the transmit pin on the module.
DS306-3
May 03
2003 REG No 277 4001, England.
Page 6
Radio Transmitter & Receiver Modules
T6 / R6
Application Circuit
The application circuits show how the QFMT6 transmitter and the QFMR6 receiver can easily be integrated into a system to form a wireless link.
ANTENNA
ANTENNA +5V +5V
+5V
+5V
T5 1 2 3 4 5
1
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 ROSC
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
2 3 4 5 6 7 8 9
Quasar R5 12 34567
Figure 3: QFMT6 Quasar Transmitter Application Circuit
Figure 4: QFMR6 Quasar Receiver Application Circuit
RSSI Values:
The QFMR6 RSSI output provides a DC output proportional to the RF input signal. The table shows the typical RSSI value depending on the RF signal strength
RF Signal Strength / dBm -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 RSSI / V 1.35 1.41 1.57 1.79 1.8 1.8 2.15 2.45 2.58 2.59 2.59
Typical RSSI Characteristics of the QFMR6
3.00 2.80 2.60 2.40 2.20 2.00 1.80 1.60 1.40 1.20 1.00
AGC Action
RSSI (Volts)
-120 -110
-100
-90
-80
-70
-60
-50
-40
-30
-20
RF Signal strength / dBm
Note that the region between -90 and -70 is with receiver AGC (automatic gain control) operating. If required, a receiver version with AGC disabled can be provided as a factory pre-set option. This would linearise the RSSI curve.
R. F. Solutions Ltd.,
Unit 21, Cliffe Industrial Estate, Lewes, E Sussex, BN8 6JL, England Tel +44 (0)1273 898 000 Fax +44 (0)1273 480 661 http://www.rfsolutions.co.uk Email sales@rfsolutions.co.uk
R F Solutions is a member of the Low Power Radio Association.
Information contained in this document is believed to be accurate, however no representation or warranty is given and R.F. Solutions Ltd. assumes no liability 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.
DS306-3
May 03
2003 REG No 277 4001, England.
Page 7

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