Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Issue 5, November 2004
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
TXM-433
UHF Radio Telemetry Transmit Module
The TXM-433-5 and TXM-433-10 integrate
a low power FM UHF radio transmitter on
a small module. Together with the matching
RX2-433-14 or RX2-433-40 receiver a one-
way radio data link can be achieved over a
distance up to 200 metres on open ground.
TXM-433-10 transmitter (back & front view)
Typical features include:
CE Certified by independent Notified Body
Verified to comply with harmonised radio standard ETSI EN 300 220-3 and EMC
standard ETSI EN 301 489-3 by accredited Test Laboratory
PCB Mounting, space saving SIL style
SAW controlled wide band FM transmission
High data rates, 5kbps and 10kbps versions
Analogue or Digital data input
Wide supply range 2.7V-4.0 or 6.0V-9.0V @ <17mA
The transmitter modules are most commonly employed in Wireless Security systems. The transmitter
and the matching receiver (RX2) are approved to harmonised radio standard ETSI EN 300 220-3 and
EMC standard ETSI EN 301 489-3. The TXM and RX2 modules will suit one-to-one and multi-node
wireless links in applications including car and building security, EPOS and inventory tracking, 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 applications such as hand-
held terminals.
Typical applications include :-
Domestic and commercial security
Guard patrol / lone worker protection
Medical Alert / Nurse Call systems
Mobile panic attack
Computer networking
Remote industrial process monitoring
Data transfer through hazardous environments
Lighting control, Garage door openers
Fire alarms
Picture / antique protection alarms
Remote control, Access control
Radiometrix Ltd, TXM Data Sheet
page 1
Brief description
The TXM-418 is designed to work with the matching receiver (SILRX-418). With the addition of simple
antenna the pair may be used to transfer serial data up to 200m. The range of the radio link is very
variable and depends upon many factors, principally, the type of antenna employed and the operating
environment. The 200m quoted range is a reliable operating distance over open ground using 1/4 whip
antenna at both ends of the link at 1.5m above ground. Smaller antenna, interference or obstacles (e.g.
building etc.) will reduce the reliable working range (down to 30m in extreme cases). Increased antenna
height, slow data or a larger receive antenna will increase the range (our best is 3km). We recommend
that the module evaluation kit, EVAL-418-A, can be used to assess the reliable working range under
the anticipated conditions of use.
figure 1: TXM’s block diagram
figure 2: mechanical dimensions
Pin Description
pin 1
pin 2
pin 3
pin 4
pin 5
RF GND
RF OUT
Vcc
Vss
DATA IN
This pin should be connected to the ground plane against which
the integral antenna radiates. It is internally connected to pin 4 .
Connects to the integral antenna. Output impedance is 50Ω.
Positive supply , supply voltages from +6V to +9V may be used.
0V connection for the modulation and supply.
Should be driven directly by a CMOS logic device running on the
same supply voltage as the module.
Radiometrix Ltd, TXM Data Sheet
page 2
Performance data TXM-433-5
Absolute Maximum Ratings:
Supply voltage Vcc
pin 3
Modulation input
pin 5
Operating temperature
Storage temperature
Performance Data:
ambient temperature:
supply voltage:
test circuit:
Parameter
Operating supply range (Vcc)
Supply current,
Vcc = 6.0V
Vcc = 9.0V
Radiated power (ERP)
Vcc = 6.0V
Vcc = 9.0V
20°C
+8.0V, unless noted otherwise
figure 3
Min
6.0
3.0
5.0
-16
-13
Typical
-
6.0
10.0
-10
-8
Max
9.0
10.0
17.0
-7
-5
Units
V
mA
mA
dBm
dBm
Notes
-
-
-
1
1
-
-
2
3
4
4
5
-0.7V
-0.7V
to
+ 12V
to
+ 9V
-10 °C
to
+ 55 °C
-40 °C
to
+ 100 °C
Transmit frequency (Frf)
Initial frequency accuracy
Overall frequency accuracy
Spurious radiation
FM deviation (+/-)
Modulation Bandwidth (-3dB) analogue
Modulation digital pulse width
418.00 / 433.92
MHz
-80
-
+80
kHz
-95
-
+95
kHz
Meets the EN300 220-1 standard
15
25
40
kHz
DC
-
10
kHz
100
-
-
µs
Notes
1. Module on 50mm square ground plane, helical antenna
2. Supply 6V to 9V, temp -10°C to +55°C.
3. <-54 dBm in bands 41-68, 87.5-118, 162-230 & 470-862 MHz
<-36 dBm else where below 1GHz , <-30dBm above 1GHz
4. Standard modulation: 2kHz square wave, 0 to Vcc
5. High or Low pulse.
figure 3: TXM 5kbps version test circuit
Radiometrix Ltd, TXM Data Sheet
page 3
Performance data TXM-418-10 and TXM-433-10
Absolute Maximum Ratings:
Supply voltage Vcc
pin 3
Modulation input
pin 5
Operating temperature
Storage temperature
Performance Data:
ambient temperature:
supply voltage:
test circuit:
Parameter
Operating supply range (Vcc)
Supply current,Vcc = 2.7V
Vcc = 4.0V
Conducted power in to 50
Ω,
Vcc = 2.7V
Vcc = 3.6V
Transmit frequency (Frf)
Initial frequency accuracy
Overall frequency accuracy
Spurious radiation
FM deviation (+/-)
Modulation Bandwidth (-3dB) analogue
Modulation digital pulse width
20 °C
3.0V, unless noted otherwise
figure 4
Min
2.7
3.0
5.0
-
-
Typical
3.2
6.0
10.0
-5
0
433.92
0
0
25
-
-
Max
4
13.0
17.0
-
-
Units
V
mA
mA
dBm
dBm
MHz
kHz
kHz
kHz
kHz
µs
Notes
-
-
-
1
1
-
-
1
2
3
3
4
-0.7
-0.7
-40°C
to
to
-10°C
to
+ 6V
+ 13V
to
+ 55°C
+ 100°C
-85
-95
15
DC
50
+85
+95
40
20
-
Notes
1. Supply 2V to 3.6V, temp -10°C to +55°C.
2. <-54 dBm in bands 41-68, 87.5-118, 162-230 & 470-862 MHz
<-36 dBm else where below 1GHz , <-30dBm above 1GHz
3. Standard modulation: 2kHz square wave, 0 to Vcc
4. High or Low pulse.
Radiometrix Ltd, TXM Data Sheet
page 4
figure 4: TXM 10kbps version test circuit
figure 5: Typical performance curves
The TXM-UHF transmitter requires only a data modulation input, supply, ground and an antenna.
Power supply requirements
•
The module will operate over the range 6V to 9V and is typically powered by either 9 Volt 'PP3'.
•
The module is not reverse polarity protected. Reverse supply voltages higher than 2V will cause
damage and must therefor be externally protected against.
Modulation requirements
•
The TXM-UHF transmitter has a DC to 10kHz modulation bandwidth and will accept direct
analogue (AFSK) or digital data. A modulation low-pass filter (10kHz @ -6dB, 1st order) is use
internally.
•
Although the modulation bandwidth of the transmitter extends down to DC as does the AF output of
the receivers, it is not possible to pass data with a DC component due to frequency errors & drifts
between the transmitter and receiver. Frequency differences between the transmitter and receiver
will produce a DC offset error which causes the data slicer in the receiver module to give errors on
long high or low pulses which exceed the maximum pulse width, see the receiver's data sheet for
more detailed information.
Radiometrix Ltd, TXM Data Sheet
page 5
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