EW
N
24 August 2007
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
TX2H-4xx-64
UHF High Power FM Transmitter
The TX2H is a 433/434MHz single-channel FM
transmitter module with a power output of
25mW nominal. It is a 100% pin-compatible
drop-in replacement for the Radiometrix TX2
and can be used to replace the TX2 in
applications where greater radiated power is
desired (for example when space limitations
dictate the use of small and inefficient antennas,
or in countries where the extra power is
permitted). The module will handle raw data
rates up to 64kb/s. The TX2H transmitter can be
used with either RX2 or RX2A receivers.
Features
•
•
•
•
•
•
•
•
Figure 1: TX2H-433-64-5V & RX2A-433-64
Standard frequencies: 433.92MHz and 434.42MHz
Hi power drop in replacement for TX2
Data rates up to 64kbps
Usable range over 500m
Fully screened
Low power requirements
Conforms to European EN 301 489-3 and ETSI EN 300 220-3 (for ERP
≤10mW)
Conforms to Australian/New Zealand AS/NZS 4268:2003
Instead of the SAW-based technology of the TX2, the TX2H uses a PLL circuit locked to a crystal for
better frequency stability over a wider temperature range (-40C to +85C), at the expense of slightly
slower power-up.
The TX2H is available as standard on frequencies of 433.92MHz and 434.42MHz at 25mW power output,
in either 3V(3.3V) or 5V versions. Custom frequencies may be available to order (consult factory). The
module is designed to meet all applicable EMC and type approval requirements.
The module can be made available if required in an extra-high-power version (TX2EH), in the same
footprint and pinout but giving 90-100mW nominal output power at 5V supply with a current
consumption of less than 45mA (DC to RF conversion efficiency better than 45%).
Applications
•
•
•
•
•
•
Handheld terminals
Data loggers
Industrial telemetry and telecommand
In-building environmental monitoring and control
High-end security and fire alarms
Vehicle data up / download
Technical Summary
•
•
•
•
•
•
Size: 32 x 12 x 5.5mm
Operating frequency: 433.92MHz and 434.42MHz
Supply : 3V or 5V regulated
Current consumption: 25mA typical
Data bit rate: 64kbps max.
Transmit power: +14dBm (25mW) nominal
TX2H – Data
Page - 1 -
sales@radiometrix.com
Functional description
The TX2H transmitter module is a crystal based PLL controlled FM transmitter operating on either 3V
or 5Vsupply and is available in 433.92MHz.
R1
3
3V / 5V
868/915 MHz
band pass
filter
2
RF out
amp
buffer
VCO
÷
64
φ
ref
osc
35kHz
LPF
R2
5
TXD
Loop
Filter
1
RF GND
4
0V
Figure. 2: TX2H block diagram
User interface
32 mm
5.5 mm
12.0 mm
Radiometrix
TX2H UHF Transmitter
12.5 mm
pin spacing:
2.54 mm
20.32 mm
1
2
3
4
5
PCB level
5 holes of 0.7 mm dia.
pin spacing 2.54 mm
1 = RF gnd
2 = RF out
3 = Vcc
4 = 0V
5 = TXD
Figure 3: TX2H pin-out and dimension
TX2H pin
1
2
3
4
5
Name
RFgnd
RF out
VCC
0V
TXD
Function
RF ground, internally connected to the module screen and pin 4 (0V). This pin
should be directly connected to the RF return path - e.g. coax braid, main PCB
ground plane etc.
50Ω RF output to antenna. Internally DC-isolated.
+ve supply pin. The module will generate RF when the Vcc supply is present.
Max ripple content 0.1Vp-p. A 100nF de-coupling ceramic capacitor is
suggested.
DC supply ground. Internally connected to pin 1 and module screen.
This DC coupled modulation input will accept either serial digital data ( 0 V to
Vcc levels) or high level linear signals. Input impedance is 100 kΩ
sales@radiometrix.com
TX2H – Data
Page - 2 -
Preliminary Specifications (TX2H-433-64-5V):
Figures apply at +25°C, 3.0V or 5.0V supply as applicable, unless otherwise stated.
Operating temperature range
Supply voltage (3V version)
Supply voltage (5V version and TX2EH)
Supply current
Supply current (for TX2EH version)
Output power
Output power (for TX2EH version)
DC to RF conversion efficiency (3V version)
DC to RF conversion efficiency (5V version)
DC to RF conversion efficiency (for TX2EH)
Harmonics/spurious emissions
Initial centre frequency accuracy
Centre frequency variation over volts/temp
FM deviation
Power-up time (DC on to full RF output)
Baseband bandwidth
Maximum raw data rate
Required TXD input levels
-40°C to +85°C
2.5 - 3.5V (3.0V nominal, 4.0V absolute max.)
4.5 - 5.5V (5.0V nominal, 6.0V absolute max.)
25mA typical
45mA typical
+14dBm (25mW), ±1dB
+20dBm (100mW), ±1dB
33% approx.
20% approx.
45% approx.
<-36dBm below 1GHz, <-30dBm above 1GHz
(<-40dBm typical)
±15kHz max.
±40kHz max.
±30kHz typical
1.1ms typical, 1.5ms max.
DC-35kHz approx.
64kbps
0V (logic 0), +5V (logic 1). Non-inverting.
Product designations:
TX2H-433-64-3V (433.92MHz, 3V version)
TX2H-433-64-5V (433.92MHz, 5V version)
TX2H-434-64-3V (434.42MHz, 3V version)
TX2H-434-64-5V (434.42MHz, 5V version)
TX2EH-433-64-5V (433.92MHz, 100mW version)
TX2EH-434-64-5V (434.42MHz, 100mW version)
sales@radiometrix.com
TX2H – Data
Page - 3 -
Antenna requirements
Three types of integral antenna are recommended and approved for use with the module:
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
RF-GND
C2
C3
C4
C1
track width = 1mm
4 to 10 cm inside area
2
RF
B. Loop antenna
16.4cm
wire, rod, PCB-track or a combination
of these three
RF
C. Whip antenna
433 MHz = 16.4 cm total from RF pin.
Fig.8: Antenna
A
helical
**
**
***
**
B
loop
*
*
**
***
C
whip
***
***
*
*
Ultimate performance
Easy of design set-up
Size
Immunity proximity effects
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.
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 15.5cm (1/4 wave @ 433MHz). Keep the 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
B)
Loop
C)
Whip
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.
sales@radiometrix.com
TX2H – Data
Page - 4 -
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/
Information Requests
Ofcom
Riverside House
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
European Radiocommunications Office (ERO)
Peblingehus
Nansensgade 19
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
ero@ero.dk
www.ero.dk
sales@radiometrix.com
TX2H – Data
Page - 5 -
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