DS305_2 April 01 2001 REG No 277 4001, England. Page 1
FM Radio Transmitter & Receiver Modules T5 / R5
Features
• MINIATURE SIL PACKAGE
• FULLY SHIELDED
• DATA RATES UP TO 128KBITS/S
• RANGE UPTO 300 METRES
• SINGLE SUPPLY VOLTAGE
• INDUSTRY PIN COMPATIBLE
QFMT5-434
• TEMP RANGE -20°C to +55°C
• NO ADJUSTABLE COMPONENTS
• GOOD SHOCK RESISTANCE
• TEMPERATURE COMPENSATED RF
OUTPUT
Applications
• VEHICLE ALARM SYSTEMS
• REMOTE GATE CONTROLS
• GARAGE DOOR OPENERS
• DOMESTIC AND COMMERCIAL SECURITY
General Description
The QFMT5 and QFMR5 data link modules are
miniature UHF radio modules, which enable the
implementation of a simple telemetry link upto 300
metres, and at data rates of up to 128Kbit/s
The QFMT5 and QFMR5 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.
QFMR5-434
• HIGH SENSITIVTY
• ANALLOUGE, DIGITAL OUTPUTS
• SIGNAL STRENGTH OUTPUT (RSSI)
• ON BOARD AGC
• SINGLE CONVERSION FM SUPER-HET
• DOUBLE RF FILTERING (INC. SAW FRONT
END)
Because of its small size and low power
requirements, these modules are ideal for use in
portable battery powered wireless applications.
FM Radio Transmitter & Receiver Modules T5 / R5
DS305_2 April 01 2001 REG No 277 4001, England. Page 2
Connection Diagram
T5
1 2 3 4 5
Figure 1: Transmitter
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.)
RF OUT (pin2)
50Ω RF antenna output. To achieve best results
the antenna impedance must match that of the
module.
V
CC
(pin 3)
+Ve supply pin (3.0 to 9.0 volts). The module will
generate RF when V
CC
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 47KΩ 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 Description
QFMT5-434-5V Transmitter 433.92MHz 5v
QFMT5-434-3V Transmitter 433.92MHz 3v
QFMT5-434-128 Transmitter 433.92MHz 5v
128Kbps Data rate
Figure 2: Receiver
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 (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.
GND (pin 4)
Connect to power supply ground.
V
CC
(pin 5)
+Ve supply pin. Operation from a 5V supply able
to source6mA at less than V
p-p
ripple.
AF (pin 6)
Audio frequency output.
DATA OUT (pin 7)
CMOS compatible output. This may be used to
drive external decoders.
Part No Description
QFMR5-434-15 Receiver 433.92MHz
15Kbps Data rate
QFMR5-434-50 Receiver 433.92MHz
50Kbps Data rate
QFMR5-434-128 Receiver 433.92MHz
128Kbps Data rate
Quasar
R 5
1 2 3 4 5 6 7
FM Radio Transmitter & Receiver Modules T5 / R5
DS305_2 April 01 2001 REG No 277 4001, England. Page 3
Absolute Maximum Ratings: Transmitter QFMT5
Operating temperature: -20°C to +55°C
Storage temperature: -40°C to +100°C
Supply Voltage (pin 3) 10V
Data input (pin 5) 10V
RF Out (pin 2) ±50V @ < 10MHz , +20dBm @ > 10MHz
Electrical Characteristics: Transmitter T5
pin Min. typ. Max. units notes
DC LEVELS
Supply voltage 3 4.5 5.0 5.5 Volts
Current & RF POWER
433.92 MHz
Supply current @ V
CC
= 5V 3 12 mA 1
RF power 2 9 +12 dBm 1
RF & Data
2
nd
harmonic -50 dBc 1
Harmonics @ > 1GHz -46 dBc 1
Initial frequency accuracy
±50
KHz
Overall frequency accuracy
±75
KHz
Modulation bandwidth @ -3dB 10 KHz
Modulation distortion (THD) %
Power up time to full RF 10
µs
Data rate 50000 bits/s
Data pulse width 40
µs
Note 1: measured into a 50Ω impedance
FM Radio Transmitter & Receiver Modules T5 / R5
DS305_2 April 01 2001 REG No 277 4001, England. Page 4
Absolute Maximum Ratings: Receiver QFMR5
Operating temperature: -10°C to +55°C
Storage temperature: -40°C to +100°C
Supply Voltage (pin 5) 7V
RF Input (pin 1) +20dBm
Electrical Characteristics: Receiver R5
Pin min. typ. Max. units notes
DC LEVELS
Supply voltage 5 4.5 5.0 5.5 Volts
Supply current 4.8 mA
Supply ripple - - 10 mV
p-p
Data output high 4.0 V
Data output low 0.5 V
RF
RF sensitivity -107 dBm
IF Bandwidth 230 KHz
Initial signal accuracy
±22
KHz
Max. RF input 20 dBm
E.M.C
Spurious responses upto 1GHz <60 dB
LO leakage, conducted <60 dBm
LO leakage, radiated <60 dBm
Dynamic Timings
Power up to stable data (With RF signal
present)
tba mS
Signal to stable data (With power suplly
already on)
tba mS
Power up to valid RSSI (With RF signal
present)
tba mS
Mark : space ratio 50 %
Bit rate 100 50000 bps
FM Radio Transmitter & Receiver Modules T5 / R5
DS305_2 April 01 2001 REG No 277 4001, England. Page 5
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 @ ¼ wavelength
(15.5cm @ 433.92MHz). Further range may be
achieved if the ¼ 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
Figure 3: Antenna Configurations To Be Used
With The QFMT5 & QFMR5 Modules
Application Circuit
The application circuits show how the QFMT5
transmitter and the QFMR5 receiver can easily be
integrated into a system to form a wireless link.
T5
A0
A1
A2
A3
A4
A5
A6
A7
VSS AD8
AD9
AD10
AD11
TE\
OSC2
OSC1
DOUT
VDD
1
2
3
4
5
6
7
8
9 10
11
12
13
14
15
16
17
18
HT12E
R
OSC
+5V
4 51 2 3
+5V
ANTENNA
Figure 4: QFMT5 Transmitter Application
Circuit
Figure 5: QFMR5 Receiver Application Circuit
RSSI Values:
The QFMR5 RSSI output provides a DC output
proportional to the RF input signal. The table
below shows the typical RSSI value depending on
the Rf signal strength.
RF Signal Strength / dBm RSSI / V
-110 tba
-100
-90
-80
-70
-60
-50
-40
-30
-20
RF
RF
Helical Antenna
Whip Antenna
34mm @ 433MHz
17 turns equally spaced
∅
= 5mm (inside)
15.5cm @ 433MHz
A0
A1
A2
A3
A4
A5
A6
A7
VSS D8
D9
D10
D11
DIN
OSC2
OSC1
VT
VDD
1
2
3
4
5
6
7
8
9 10
11
12
13
14
16
18
HT12D
+5V
15
R
OSC
DATA OUT 1
DATA OUT 2
DATA OUT 3
DATA OUT 4
17
1K5
ΩΩ
Quasar
R 5
1 2 3 4 5 6 7
+5V
ANTENNA
FM Radio Transmitter & Receiver Modules T5 / R5
DS305_2 April 01 2001 REG No 277 4001, England. Page 6
Mechanical Dimensions
Figure 6: Transmitter
Figure 7: Receiver
Should you require further assistance please contact :
R F Solutions Ltd.,
Unit 21, Cliffe Industrial Estate,
South Street, Lewes,
E. Sussex. BN8 6JL, England
Tel: +44 (0)1273 898 000 Fax: +44 (0)1273 480 661
Email : [email protected] http://www.rfsolutions.co.uk
Quasar
R 5
1 2 3 4 5 6 7
31mm
pin spacing 2.54mm
17.5mm
49.05mm 4.65mm
Pin spacings 2.54 mm
Pin Dia 0.5mm
pin 1 is 2.33mm from edge of module
All dimensions +/- 0.5mm
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.
T5
CE
31.5 mm
10.5 mm
3.0 mm
20.32 mm
1 2
3 4 5
Pin spacings 2.54 mm
Pin Dia 0.5mm
All dimensions +/- 0.5mm
1.5mm
3.5mm
