RX3A-914-10 [RADIOMETRIX]
UHF FM Data Transmitter and Receiver Modules; UHF FM数据发送器和接收器模块
| 型号： | RX3A-914-10 |
| 厂家： | 
RADIOMETRIX LTD |
| 描述： | UHF FM Data Transmitter and Receiver Modules |
| 文件： | 总15页 (文件大小：452K) |
| 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 1, 01 November 2004
TX3A & RX3A
UHF FM Data Transmitter and Receiver Modules
European versions: TX3A-869-64/RX3A-869-xx
USA versions:
TX3A-914-64/RX3A-914-xx
Data speed options (-xx) : -10 (10kbps), -64 (64kbps)
The TX3A & RX3A are miniature UHF
radio transmitter
designed for PCB
&
receiver modules
mounting. They
facilitate the simple implementation of
data links at speeds up to 64kbps and
distances up to 75m in-building or 300m
over open ground.
TX3A Transmitter
RX3A Receiver
Features:
Frequencies available as standard: 869.85MHz, 914.5MHz
CE certified by independent Notified Body
Verified to comply with Radio standard EN 300 220-3 by accredited Test Laboratory
Verified to comply with EMC standard EN 301 489-3 by accredited Test Laboratory
North American version conforms to FCC part 15.249
Data rates up to 64kbps
Fully screened
Available for operation in the 868-870MHz band in Europe and the 902–928MHz band in
North America, both modules combine full screening with internal filtering to ensure EMC
compliance by minimising spurious radiation and susceptibility. The TX3A & RX3A will suit
one-to-one and multi-node wireless links in such applications as car and building security,
EPOS and inventory tracking, remote industrial process monitoring and data networks.
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.
Transmitter – TX3A
Crystal-locked PLL, FM modulated at up to 64 kb/s
Operation from 2.2V to 16V @ 7.5mA
Built-in regulator for improved stability and supply noise rejection
1mW nominal RF output
Enable facility
Receiver – RX3A
Single conversion FM superhet with SAW front end filter
Operation from 2.7V to 16V @ 11mA
Built-in regulator for improved stability and supply noise rejection
-100dBm sensitivity @ 1ppm BER, 64kb/s version
-107dBm sensitivity @ 1ppm BER, 10kb/s version
RSSI output with 60dB range
Enable facility
Extremely low LO leakage, -120dBm typical
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 1
Functional description
The TX3A transmitter module uses a frequency modulated crystal-locked PLL and operates
between 2.2V and 16V at a current of 7.5mA nominal. At 3V supply it delivers nominally
0dBm (1mW) RF output. The SIL style TX3A measures 32 x 12 x 3.8 mm, excluding pins.
The RX3A module is a single conversion FM superhet receiver capable of handling data rates
of up to 64kbps. It will operate from a supply of 2.7V to 16V and draws 11mA when receiving.
The RX3 features a fast power-up time for effective duty cycle power saving and a signal
strength (RSSI) output with 60dB of range. Full screening and a SAW front-end filter give
good immunity to interference. The SIL style RX3A measures 48 x 17.5 x 4.5 mm, excluding
pins.
TX3A transmitter
supply
5
regulator
2.2 -- 12V
4
En
868/915 MHz
band pass
filter
ref
osc
35kHz
LPF
buffer
64
÷
φ
2
V C O
7
TXD
RF out
Loop
Filter
3
RF gnd
6
1
0V
Fig 1 :TX3A block diagram
Pin description
RF GND (pins 1&3)
3.8 mm
32 mm
RF ground, internally connected to the
module screen and pin 6 (0V). These
pins should be directly connected to the
RF return path - e.g. coax braid, main
PCB ground plane etc.
12.0
mm
12.5
mm
Radiometrix
TX3A
RF OUT
(pin 2)
50Ω RF output to the antenna.
Internally DC-isolated. See antenna
section of apps notes for details of
suitable antennas.
PCB level
1 = RF GND
15.24 mm
2 = RF OUT
3 = RF GND
4 = En
5 = Vcc
6 = 0V
2
3
4
5
6
7
1
En
(pin 4)
7 = TXD
Tx enable. <0.15V shuts down module
(current <1µA). >1.7V enables the
7 holes, 0.7 mm dia, pin spacing 2.54 mm
transmitter. Impedance ~1MΩ. Observe
slew rate requirements (see apps notes).
Fig2: TX3A physical dimensions
Vcc
(pin 5)
+2.2V to +16V DC supply. Max ripple content 0.1VP-P. Decoupling is not generally required.
0V (pin 6)
DC supply ground. Internally connected to pins 1 & 3 and module screen.
TXD (pin 7)
DC-coupled modulation input. Accepts serial digital data at 0V to 2.5V levels.
See applications notes for suggested drive methods. Input is high impedance (>100kΩ).
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 2
RX3A receiver
5
869/914MHz
SAW BPF
10.7MHz IF filter
RSSI
MIXER
10.7MHz
ceramic
discriminator
IF2/Lim
10.7MHz
IF1
10.7MHz
LNA 2
LNA 1
1
RF in
Audio LPF
fRF - 10.7MHz)
AF
buffer
8
AF out
CL
32
VCO
data
slicer
9
RXD
RT
CT
XTAL OSC.
10k
Ω
+2.8V
Low
Loop filter
7
V
Crystal
26/28MHz detector
Phase
regulated
to circuit
dropout
regulator
cc
(Fixed frequency PLL Osc.)
4
En
6
0V
2, 3
RF gnd
Fig.3: RX3A block diagram
Pin description
48 mm
4.5 mm
RF IN
(pin 1)
50Ω RF input from antenna.
Internally DC-isolated. See
antenna section of applications
notes for suggested antennas and
feeds.
RX3A
Radiometrix
RF GND
(pins 2 & 3)
PCB level
RF ground, internally connected to
the module screen and pin 6 (0V).
These pins should be connected to
the RF return path - e.g. coax
25.4 mm
1 = RF IN
2 = RF GND
3 = RF GND
4 = En
5 = RSSI
6 = 0V
7 = Vcc
braid, main PCB ground plane etc.
1
2
3
4
5
6
7
8
9
8 = AF out
9 = RXD
En
(pin 4)
9 holes of 0.7 mm dia. pin spacing 2.54mm
Rx enable. <0.15V shuts down
module (current <1µA). >1.7V enables
the receiver. Impedance ~1MΩ. Observe
slew rate requirements (see apps notes).
Fig.4: RX3A physical dimensions
RSSI
(pin 5)
Received signal strength indicator with >65dB range. See applications notes for typical characteristics.
0V (pin 6)
DC supply ground. Internally connected to pins 2 & 3 and module screen.
Vcc (pin 7)
+2.7V to +16V DC supply. Max ripple content 0.1VP-P. Decoupling is not generally required.
AF out (pin 8)
Buffered and filtered analogue output from the FM demodulator. Standing DC bias 1V approx. External
load should be >10kΩ // <100pF.
RXD
(pin 9)
Digital output from the internal data slicer. The data is true data, i.e. as fed to the transmitter.
Output is “open-collector” format with internal 10kΩ pull-up to Vcc (pin 7).
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 3
Absolute maximum ratings
Exceeding the values given below may cause permanent damage to the module.
Operating temperature
Storage temperature
-20°C to +70°C
-40°C to +100°C
TX3A
Vcc (pin 5)
TXD (pin 7)
En (pin 4)
RF OUT (pin 2)
-0.3V to +16V
±7V
-0.3V to +Vcc V
±50V DC, +10dBm RF
RX3A
Vcc, RXD (pins 7,9)
En (pins 4)
RSSI, AF (pins 5, 8)
RF IN (pin 1)
-0.3V to +16V
-0.3V to +Vcc V
-0.3V to +3V
±50V DC, +10dBm RF
Performance specifications:
TX3A transmitter
(Vcc = 3.0V / temperature = 20°C unless stated)
pin
min.
typ.
max.
units
notes
DC supply
Supply voltage
Supply current
5
5
2.2
3.0
7.5
16
9.5
V
mA
1,6
2
RF
RF power output @ Vcc = 2.2V
RF power output @ Vcc ≥ 2.8V
Harmonics / spurious emissions
Initial frequency accuracy
FM deviation (peak)
2
2
2
-1
0
-55
0
dBm
dBm
dBc
kHz
kHz
2
2
3
-45
+25
-25
0
±30
4
Baseband
Modulation bandwidth @ -3dB
Modulation distortion (THD)
TXD input level (logic low)
TXD input level (logic high)
35
10
+0.2
+3
kHz
%
V
5
0
+2.5
6
5,6
5,6
7
7
-0.2
+2.3
V
Dynamic timing
Power-up time (En → full RF)
1.0
1.5
ms
Notes:
1. RF output is automatically disabled below 2.2V supply voltage.
2. RF output terminated with 50Ω resistive load.
3. Meets or exceeds EN/FCC requirements at all frequencies.
4. With 0V – 2.5V modulation input.
5. To achieve specified FM deviation.
6. See applications information for further details.
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 4
Performance specifications:
RX3A receiver
(Vcc = 3.0V / temperature = 20°C unless stated)
pin
min.
typ.
max. units
notes
DC supply
Supply voltage
Supply current
7
7
2.7
10
5.0
11
16
16
V
mA
1
RF/IF
RF sensitivity @ 10dB (S+N)/N
RF sensitivity @ 10dB (S+N)/N
RF sensitivity @ 1ppm BER
RF sensitivity @ 1ppm BER
1, 8
1, 8
1, 9
1, 9
-114
-107
-107
-100
dBm
dBm
dBm
dBm
10kbps
64kbps
10kbps
64kbps
Max operational RF input
RSSI threshold
RSSI range
1
1,5
1,5
-10
-120
60
dBm
dBm
dB
IF bandwidth
Image rejection
IF rejection (10.7MHz)
LO leakage, conducted
180
50
kHz
dB
dB
1
1
1
40
100
-120
-110
dBm
Baseband
Baseband bandwidth @ -3dB
Baseband bandwidth @ -3dB
AF level
DC offset on AF out
Distortion on recovered AF
Ultimate (S+N)/N
8
8
8
8
8
0
0
200
0.3
7.8
50
400
1.75
10
kHz
kHz
mVP-P
V
%
dB
10kbps
64kbps
300
1.0
1
2
3
3
8
40
Load capacitance, AFout / RXD
8,9
100
pF
Dynamic timing
Power up with signal present
Power up to valid RSSI
Power up to stable data
Power up to stable data
4,5
4,9
4,9
1
10
5
ms
ms
ms
30
10
3, 10kbps
3, 64kbps
Signal applied with supply on
RSSI response time (rise/fall)
Signal to stable data
1, 5
1, 9
1,9
100
5
5
µs
ms
ms
30
10
3, 10kbps
3, 64kbps
Signal to stable data
Time between data transitions
Time between data transitions
Mark : space ratio
9
9
9
0.1
15.6
20
15
1500
80
4, 10kbps
4, 64kbps
5
µs
%
50
Notes: 1. Current increases at higher RF input levels (-20dBm and above).
2. For received signal with ±30kHz FM deviation.
3. Typical figures are for signal at centre frequency, max. figures are for ±50kHz offset.
4. For 50:50 mark to space ratio (i.e. square wave).
5. Average over 30ms (10kbps version) or 3ms (64kbps version) at maximum data rate.
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 5
Module test circuits
TX3A
1
Radiometrix
2kHz
2.5V
0V
2
5
6
7
3
4
TXD
Vcc
RF out
50
Ω
En
GND
Fig.5: TX3A test circuit
Radiometrix
7
RX3A
3
4
5
6
9
8
1
2
RXD
AF out
Vcc
RF in
50
Ω
RSSI
En
0V (GND)
Fig.6: RX3A test circuit
Applications information
Power supply requirements
Both modules incorporate a built-in regulator which delivers a constant 2.8V to the module
circuitry when the external supply voltage is 2.85V or greater, with 40dB or more of supply
ripple rejection. This ensures constant performance up to the maximum permitted supply rail
and removes the need for external supply decoupling except in cases where the supply rail is
extremely poor (ripple/noise content >0.1Vp-p).
Note, however, that for supply voltages lower than 2.85V the regulator is effectively
inoperative and supply ripple rejection is considerably reduced. Under these conditions the
ripple/noise on the supply rail should be below 10mVp-p to avoid problems. If the quality of the
supply is in doubt, it is recommended that a 10µF low-ESR tantalum or similar capacitor be
added between the module supply pin (Vcc) and ground, together with a 10Ω series feed
resistor between the Vcc pin and the supply rail.
The Enable pin allows the module to be turned on or off under logic control with a constant
DC supply to the Vcc pin. The module current in power-down mode is less than 1µA.
NOTE: If this facility is used, the logic control signal must have a slew rate of 40mV/µs or
more. Slew rates less than this value may cause erratic operation of the on-board regulator
and therefore the module itself.
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 6
The TX3A incorporates a low voltage shutoff circuit which prevents any possibility of erratic
operation by disabling the RF output if the supply voltage drops below 2.2V (±5%). This
feature is self-resetting, i.e. restoring the supply to greater than 2.2V will immediately restore
full RF output from the module.
TX3A modulation requirements
The module will produce the specified FM deviation with a TXD input to pin 7 of 2.5V
amplitude, i.e. 0V “low”, 2.5V “high”. Reducing the amplitude of the data input from this value
(usually as a result of reducing the supply voltage) reduces the transmitted FM deviation to
typically ±25kHz at the lower extreme of 2.2V. The receiver will cope with this quite happily
and no significant degradation of link performance should be observed as a result.
Where standard 2-level digital data is employed with a logic “low” level of 0V ±0.2V, the logic
“high” level applied to TXD may be any value between +2.5V and +3V for correct operation.
However, if using multi-level or analogue signalling the maximum positive excursion of the
modulation applied to TXD must not exceed +2.5V or waveform distortion will result. If the
input waveform exceeds this level a resistive potential divider should be used at the TXD
input to reduce the waveform amplitude accordingly. This input is high impedance (>100kΩ)
and can usually be ignored when calculating required resistor values.
Data formats and range extension
The TX3A data input is normally driven directly by logic levels but will also accept analogue
drive (e.g. 2-tone signalling). In this case it is recommended that TXD (pin 7) be DC-biased to
1.25V with the modulation ac-coupled and limited to a maximum of 2.5Vp-p to minimise
distortion over the link. The varactor modulator in the TX3A introduces some 2nd harmonic
distortion which may be reduced if necessary by predistortion of the analogue waveform. At
the other end of the link the RX3A AF output is used to drive an external decoder directly.
Both the AF output on pin 8 and the RXD output on pin 9 of the RX3A are “true” sense, i.e. as
originally fed to the transmitter.
Although the modulation bandwidth of the TX3A extends down to DC, as does the AF output
of the RX3A, it is not advisable to use data containing a DC component. This is because
frequency errors and drifts between the transmitter and receiver occur in normal operation,
resulting in DC offset errors on the RX3A audio output.
The RX3A incorporates a low pass filter which works in conjunction with similar filtering in
the TX3A to obtain an overall system bandwidth of 32kHz. This is suitable for transmission of
data at raw bit rates up to 10kbps and 64kbps, depending on the receiver version. To keep
settling times within reasonable limits for the data speed in use, the adaptive data slicer in
the RX3A is subject to a maximum time limit between data transitions (see page 5). This
limitation must be taken into account when choosing a code format. It is strongly
recommended that a reasonably balanced code containing no long 1s or 0s (such as
Manchester or similar) is employed.
In applications such as longer range fixed links where data speed is not of primary
importance, a significant increase in range can be obtained by using the slowest possible data
rate together with filtering to reduce the receiver bandwidth to the minimum necessary. In
these circumstances, because of the limitations of the internal data slicer it is better to use the
RX3A audio output to drive an external filter and data slicer.
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 7
RX3A Received Signal Strength Indicator (RSSI)
The RX3A receiver incorporates a wide range RSSI which measures the strength of an
incoming signal over a range of 60dB or more. This allows assessment of link quality and
available margin and is useful when performing range tests.
The output on pin 5 of the module has a standing DC bias of typically 0.25V with no signal,
rising to 1.1V at maximum indication. The RSSI output source impedance is high (~50kΩ) and
external loading should therefore be kept to a minimum.
Typical RSSI characteristic is as shown below:
RSSI (V)
1.2
1
0.8
0.6
0.4
0.2
0
-120
-110
-100
-90
-80
-70
-60
-50
RF input Level (dBm)
Fig.7: RX3A RSSI response curve
To ensure a reasonably fast response the RSSI has limited internal decoupling of 1nF to
ground. This may result in a small amount of ripple on the DC output at pin 5 of the module.
If this is a problem further decoupling may be added, in the form of a capacitor from pin 5 to
ground, at the expense of response speed. For example, adding 10nF here will increase RSSI
response time from 100µs to around 1ms. The value of this capacitor may be increased without
limit.
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 8
Expected range
Predicting the range obtainable in any given situation is notoriously difficult since there are
many factors involved. The main ones to consider are as follows:
•
•
•
•
•
Type and location of antennas in use (see below)
Type of terrain and degree of obstruction of the link path
Sources of interference affecting the receiver
“Dead” spots caused by signal reflections from nearby conductive objects
Data rate and degree of filtering employed (see page 7)
Assuming the maximum 64kbps data rate and unobstructed
transmitter and receiver, the following ranges may be used as a rough guide only:
¼-wave whip antennas on both
1) Cluttered/obstructed environment, e.g. inside a building
2) Open, relatively unobstructed environment
:
:
25-75m
100-300m
It must be stressed that range obtained in practice may lie outside these figures. Range tests
should always be performed before assuming that a particular range can be achieved
in any given application.
Antenna considerations and options
The choice and positioning of transmitter and receiver antennas is of the utmost importance
and is the single most significant factor in determining system range. The following notes
apply particularly to integral antennas and are intended to assist the user in choosing the
most effective arrangement for a given application.
Nearby conducting objects such as a PCB or battery can cause detuning or screening of the
antenna which severely reduces efficiency. Ideally the antenna should stick out from the top of
the product and be entirely in the clear, however this is often not desirable for
practical/ergonomic reasons and a compromise may need to be reached. If an internal antenna
must be used try to keep it away from other metal components and pay particular attention to
the “hot” end (i.e. the far end), as this is generally the most susceptible to detuning. The space
around the antenna is as important as the antenna itself.
Microprocessors and microcontrollers tend to radiate significant amounts of radio frequency
hash, which can cause desensitisation of the receiver if its antenna is in close proximity.
900MHz region is generally less prone to this effect than lower frequencies, but problems can
still arise. Things become worse as logic speeds increase, because fast logic edges are capable
of generating harmonics across the UHF range which are then radiated effectively by the PCB
tracking. In extreme cases system range can be reduced by a factor of 3 or more. To minimise
any adverse effects, situate the antenna and module as far as possible from any such circuitry
and keep PCB track lengths to the minimum possible. A ground plane can be highly effective
in cutting radiated interference and its use is strongly recommended.
A simple test for interference is to monitor the receiver RSSI output voltage, which should be
the same regardless of whether the microcontroller or other logic circuitry is running or in
reset.
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 9
Depending on the application and bearing in mind applicable legal requirements (see p.11), a
variety of antenna types may be used with the TX3A and RX3A.
Integral antennas generally do not perform as well as externally mounted types, however
they result in physically compact equipment and are the preferred choice for portable
applications. The following can be recommended:
Whip (¼-wave). This consists simply of a piece of wire or rod connected to the module at one
end. The lengths given below are from module pin to antenna tip including any
interconnecting wire or tracking. This antenna is quite simple and performs well, especially if
used in conjunction with a ground plane. This will often be provided by the PCB on which the
module is mounted, or by a metal case.
Base-loaded whip. This is a shortened whip, tuned by means of a coil inserted at the base.
This coil may be air-wound for maximum efficiency, or a small SMT inductor can be used if
space is at a premium. The value must be carefully chosen to tune the particular length of
whip in use, making this antenna more difficult to set up than a ¼-wave whip.
Helical. This is a compact but slightly less effective antenna formed from a coil of wire. It is
very efficient for its size, but has high Q and tends to suffer badly from detuning caused by
proximity to nearby conductive objects. It needs to be carefully trimmed for best performance
in a given situation and the required dimensional tolerances can be difficult to achieve
repeatably, nevertheless it can provide a very compact solution.
Loop. A loop of PCB track, tuned and matched with 2 capacitors. Loops are relatively
inefficient but have good immunity to proximity detuning, so may be preferred in shorter
range applications where very high component packing density is necessary.
L
wire, rod, PCB track
or a combination of these
RF
1/4-wave whip
L (mm) = 71250 / freq(MHz)
shortened wire, rod, PCB track etc.
with loading coil.
RF
SMT inductor may be used if reqd.
Base-loaded whip
wire spring, dia 3mm approx.
RF
RF
trim wire length, number of turns
and turns spacing for best results
Helical
track width = 1mm
2
area 100 - 400 mm
Cmatch
capacitors 0.5-5pF variable or fixed
(values depend on loop dimensions)
Ctune
RF-GND
Loop
Fig.8: Integral antenna configurations
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 10
Integral antenna summary:
whip
***
***
*
loaded whip
helical
loop
*
*
**
***
Ultimate performance
Ease of design set-up
Size
**
**
***
*
**
*
***
*
Immunity to proximity effects
**
External antennas have several advantages if portability is not an issue. They can be
optimised for individual circumstances and may be mounted in relatively good RF locations
away from sources of interference, being connected to the equipment by coax feeder. Apart
from the usual whips, helicals etc, low-profile types such as microstrip patches can be very
effective at these frequencies. Suitable antennas are available from many different sources
and are generally supplied pre-tuned to the required frequency.
Type Approval requirements: Europe
The modules are verified to comply with European harmonised standard EN 300 220-3 and
EMC standard EN 301 489-3 by United Kingdom Accreditation Service (UKAS) accredited
Test Laboratory. The modules are CE Certified by independent Notified Body. The following
provisos apply:
1) The modules must not be modified or used outside their specification limits.
2) The modules may only be used to transfer digital or digitised data. Analogue speech and/or
music are not permitted.
3) The TX3A must not be used with gain antennas such as multi-element Yagi arrays, since
this may result in allowed ERP or spurious emission levels being exceeded.
4) Final product incorporating the TX3A/RX3A should itself meet the essential requirement
of the R&TTE Directive and a CE marking should be affixed on the final product.
Type Approval requirements: USA
Radiometrix TX3A & RX3A modules are sold as component devices which require
external components and connections to function. They are designed to comply
with FCC Part 15.249 regulations, however they are not approved by the FCC. The
purchaser understands that FCC approval will be required prior to the sale or
operation of any device containing these modules.
1) Antennas must be either permanently attached (i.e. non-removable) or must use a
connector which is unique or not commonly available to the public.
2) The user must ensure that the TX3A/antenna combination does not radiate more than the
maximum permitted level of 50mV/m at 3m distance (FCC Part 15.249).
3) The appropriate FCC identifying mark and/or part 15 compliance statement must be
clearly visible on the outside of the equipment containing the module(s).
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 11
Module mounting considerations
The modules may be mounted vertically or bent horizontal to the motherboard. Good RF
layout practice should be observed – in particular, any ground return required by the antenna
or feed should be connected directly to the RF GND pins at the antenna end of the module,
and not to the OV pin which is intended as a DC ground only. All connecting tracks should be
kept as short as possible to avoid any problems with stray RF pickup.
If the connection between module and antenna does not form part of the antenna itself, it
should be made using 50Ω microstrip line or coax or a combination of both. It is desirable (but
not essential) to fill all unused PCB area around the module with ground plane.
The module may be potted, provided that precautions are taken to ensure that no compound
can enter the screening can during the potting process.
Warning: DO NOT wash the module. It is not hermetically sealed.
Variants and ordering information
The TX3A transmitter and RX3A receiver modules are manufactured in the following variants
as standard:
For European applications in the 868-870MHz band:
Frequency = 869.85MHz
TX3A-869-64
RX3A-869-64
RX3A-869-10
Transmitter
Receiver, 64kbps
Receiver, 10kbps
For USA applications in the 902-928MHz band:
Frequency = 914.5MHz
TX3A-914-64
RX3A-914-64
RX3A-914-10
Transmitter
Receiver, 64kbps
Receiver, 10kbps
Other variants can be supplied to customer requirements, at different frequencies and/or
optimised for specific data speeds and formats. Please consult the Sales Department for
further information.
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 12
CE Certificate for TX3A
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 13
CE Certificate for RX3
Radiometrix Ltd, TX3A & RX3A Data Sheet
page 14
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/
Information Requests
Ofcom
European Radiocommunications Office (ERO)
Peblingehus
Riverside House
Nansensgade 19
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
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
ero@ero.dk
www.ero.dk
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