TXM-433-10 [RADIOMETRIX]
UHF Radio Telemetry Transmit Module; 超高频无线电遥测发射模块
| 型号： | TXM-433-10 |
| 厂家： | 
RADIOMETRIX LTD |
| 描述： | UHF Radio Telemetry Transmit Module |
| 文件： | 总11页 (文件大小：337K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
Issue 5, November 2004
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 RF GND
This pin should be connected to the ground plane against which
the integral antenna radiates. It is internally connected to pin 4 .
pin 2 RF OUT
pin 3 Vcc
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.
pin 4 Vss
pin 5 DATA IN
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
Modulation input
Operating temperature
Storage temperature
pin 3
pin 5
-0.7V
-0.7V
to
to
-10 °C
to
+ 12V
+ 9V
to
+ 55 °C
-40 °C
+ 100 °C
Performance Data:
ambient temperature:
supply voltage:
test circuit:
20°C
+8.0V, unless noted otherwise
figure 3
Parameter
Min
Typical
Max
Units Notes
Operating supply range (Vcc)
6.0
3.0
5.0
-
9.0
10.0
17.0
V
mA
mA
-
-
-
Supply current,
Vcc = 6.0V
6.0
10.0
Vcc = 9.0V
Radiated power (ERP)
Vcc = 6.0V
Vcc = 9.0V
-16
-13
-10
-8
-7
-5
dBm
dBm
1
1
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
kHz
kHz
-
-
-80
-95
-
-
+80
+95
2
3
4
4
5
Meets the EN300 220-1 standard
15
DC
100
25
-
-
40
10
-
kHz
kHz
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
Modulation input
Operating temperature
Storage temperature
pin 3
pin 5
-0.7
-0.7
to
to
-10°C
to
+ 6V
+ 13V
to
+ 55°C
-40°C
+ 100°C
Performance Data:
ambient temperature:
supply voltage:
test circuit:
20 °C
3.0V, unless noted otherwise
figure 4
Parameter
Min
Typical
Max Units Notes
Operating supply range (Vcc)
Supply current,Vcc = 2.7V
Vcc = 4.0V
2.7
3.0
5.0
3.2
6.0
10.0
4
V
-
-
-
13.0 mA
17.0 mA
-
-
-5
0
-
-
dBm
dBm
1
1
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
433.92
0
0
MHz
kHz
kHz
-
-
-85
-95
+85
+95
1
2
3
3
4
15
DC
50
25
-
-
40
20
-
kHz
kHz
µs
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
•
•
Data Input, pin 5, is normally driven directly by CMOS logic levels from a data encoder IC. There is
a wide range of encoder/decoder IC’s available which may be used with the modules:
MM57C200, 57410
UM3750
HT12 series
MC14026
National Semiconductor
UMC
Holtek
Motorola
AS2787
Austria Systeme International GmbH
The encoder normally being run on the same supply voltage as the transmitter. Analogue drive eg. 2
tone FSK, is also possible, the pk to pk level should be between 5V and 9V peak to peak and must
not drive pin 5 below 0V. There will be some 2nd harmonic distortion due to the varactor modulator
(typ. <15%), this may be reduced if necessary by predistortion of the analogue waveform
Antenna requirements
Three types of integral antenna are recommended and approved for use with the module:
A) Helical:
Wire coil, connected directly to pin 2, open circuit at other end. This antenna is very
efficient given it's small size (20mm x 4mm dia.). The helical is a high Q antenna, trim
the wire length or expand the coil for optimum results. The helical de-tunes badly with
proximity to other conductive objects.
B) Loop,
C) Whip
A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and
fed from pin 2 at a point 20% from the ground end. Loops have high immunity to
proximity de-tuning.
This is a wire, rod ,PCB track or combination connected directly to pin 2 of the module.
Optimum total length is 17cm (1/4 wave @ 418MHz) Keep he open circuit (hot) end well
away from metal components to prevent serious de-tuning. Whips are ground plane
sensitive and will benefit from internal 1/4 wave earthed radial(s) if the product is small
and plastic cased
Antenna selection chart
A
B
C
helical
**
**
***
**
80m
loop
*
*
**
***
50m
whip
***
***
*
Ultimate performance
Easy of design set-up
Size
Immunity proximity effects
Range open ground to similar antenna
*
120m
The antenna choice and position directly controls the system range. Keep it clear of other metal in the
system, particularly the 'hot' end. The best position by far, is sticking out the top of the product. This is
often not desirable for practical/ergonomic reasons thus a compromise may need to be reached. If an
internal antenna must be used try to keep it away from other metal components, particularly large
ones like transformers, batteries and PCB tracks/earth plane. The space around the antenna is as
important as the antenna itself.
Radiometrix Ltd, TXM Data Sheet
page 6
0.5 mm enameled copper wire
close wound on 3.2 mm diameter former
RF
433 MHz = 24 turns
A. Helical antenna
Feed point 15% to 25% of total loop length
track width = 1mm
RF-GND
4 to 10 cm2 inside area
C2
C1
RF
C3
C4
B. Loop antenna
16.4cm
wire, rod, PCB-track or a combination
of these three
RF
433 MHz = 16.4 cm total from RF pin.
C. Whip antenna
figure 6: Antenna configurations
Duty Cycle requirements
The duty cycle is defined as the ratio, expressed as a percentage, of the maximum transmitter “on” time
on one or more carrier frequencies, relative to a one hour period. Where an acknowledgement message
is required, the additional transmitter “on” time shall be included.
There is a 10% duty cycle restriction on 433.050-434.790 MHz band in most of the EU member states.
The TXM-433 is a RF module intended to be incorporated into a wide variety of applications and
finished products, Radiometrix has no control over the end use of the TXM-433.The harmonised band
433.050 to 434.790 MHz as detailed in Annex 1 Band E of CEPT/ERC Recommendation 70-03 (which
can be downloaded at http://www.ero.dk/scripts/docmanag98/dm.dll/QueryDoc?Cat=Recommendation)
has list of countries where Duty Cycle restriction apply.
Module users should, therefore, ensure that they comply with the stated Duty Cycle requirements of
the version of CEPT/ERC Recommendation 70-03 in place at the time of incorporation of the TXM-433
into their product. It should be noted that the stated Duty Cycle must not be exceeded otherwise any
approval granted for the TXM-433 will be invalidated.
Radiometrix Ltd, TXM Data Sheet
page 7
Ordering information
The following are standard:
TXM-433-5
5kbps data rate Transmitter
RX2-433-14-5V
RX2-433-40-5V
SILRX-433-5
14kbps data rate matching Receiver
40kbps data rate matching Receiver
5kbps data rate matching Receiver
TXM-433-10
10kbps data rate Transmitter
RX2-433-14-5V
RX2-433-40-5V
SILRX-433-10
14kbps data rate matching Receiver
40kbps data rate matching Receiver
10kbps data rate matching Receiver
3V versions of the RX2 receivers are available and should be ordered with a -3V suffix on the part
number. (e.g. RX2-433-14-3V is set-up for 3V to 4V operation)
All modules are available in a 418MHz version for UK use.
All Radiometrix’s products are designed and manufactured in England
+
Radiometrix Ltd, TXM Data Sheet
page 8
CE Certificate of TXM and its variants
Radiometrix Ltd, TXM Data Sheet
page 9
Notes
Radiometrix Ltd, TXM Data Sheet
page 10
Radiometrix Ltd
Hartcran House
231 Kenton Lane
Harrow, Middlesex
HA3 8RP
ENGLAND
Tel: +44 (0) 20 8909 9595
Fax: +44 (0) 20 8909 2233
sales@radiometrix.com
www.radiometrix.com
Copyright notice
This product data sheet is the original work and copyrighted property of Radiometrix Ltd.
Reproduction in whole or in part must give clear acknowledgement to the copyright owner.
Limitation of liability
The information furnished by Radiometrix Ltd is believed to be accurate and reliable.
Radiometrix Ltd reserves the right to make changes or improvements in the design, specification
or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume
any liability arising from the application or use of any product or circuit described herein, nor
for any infringements of patents or other rights of third parties which may result from the use of
its products. This data sheet neither states nor implies warranty of any kind, including fitness
for any particular application. These radio devices may be subject to radio interference and may
not function as intended if interference is present. We do NOT recommend their use for life
critical applications.
The Intrastat commodity code for all our modules is: 8542 6000
R&TTE Directive
After 7 April 2001 the manufacturer can only place finished product on the market under the
provisions of the R&TTE Directive. Equipment within the scope of the R&TTE Directive may
demonstrate compliance to the essential requirements specified in Article 3 of the Directive, as
appropriate to the particular equipment.
Further details are available on The Office of Communications (Ofcom) web site:
http://www.ofcom.org.uk/radiocomms/ifi/licensing/licensing_policy_manual/
European Radiocommunications Office (ERO)
Peblingehus
Information Requests
Ofcom
Nansensgade 19
Riverside House
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
ero@ero.dk
2a Southwark Bridge Road
London SE1 9HA
Tel: +44 (0)845 456 3000 or 020 7981 3040
Fax: +44 (0)20 7783 4033
information.requests@ofcom.org.uk
www.ero.dk
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