Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com
AFS2
500mW UHF RF power amplifier
Issue 2, 30 July 2012
AFS2 amplifier module is intended to
increase the transmitted power of a
Radiometrix multi channel TR2M transceiver
module. It provides transmit and receive
paths, and can be simply 'dropped into' the
aerial connection. The AFS2 may be usable
with other 100mW output devices, but no
guarantees can be offered.
Features
Figure 1: AFS2-458
Conforms to EN 300 220-3 and EN 301 489-3
Custom variants from 420MHz to 470MHz on any 5MHz band
TX and RX path with <1dB loss
500mW RF power ouput (for 100mW in)
Operation at +5V (regulated)
Low current consumption: 250mA transmit, <2mA receive
Fully screened
Small Size: 33 x 23 x 9mm
Applications
Handheld terminals
EPOS and inventory tracking
Data loggers
Industrial telemetry and telecommand
In-building environmental monitoring and control
High-end security and fire alarms
Figure 2: AFS2 block diagram
Radiometrix Ltd.,
AFS2 data sheet
Page 1
User interface
Figure 3: AFS2 pin-out and dimension
Pin description
Pin
RF
1
2
3
User
1
2
3
RF Module
1
2
3
Name
Function
RF GND
Aerial
RF GND
RF Ground
RF connection to aerial (50 Ω)
RF Ground
Vcc
0V
TXE
Regulated +5v supply, at <250mA
Supply Ground
Transmit mode enable (active low, 100K pullup to +5v)
RF GND
RF in/out
RF GND
RF Ground
RF connection to radio module
RF Ground
NOTES:
1. This amplifier expects a 100mW power level to be output from the radio on transmit.
2. The TXE line should be tied to the TR2M TXE input. When this line is asserted (low) the amplifier is
turned on (drawing 280-300mA) and the RF switching connects it between the module and the
aerial. When it is inactive (high or floating) a low loss path is provided for the rx signals, from aerial
to the module.
3. If a low power transmit mode is needed, the receive path is bidirectional, and capable of carrying up
to 100mW of power. In this case the radio must be set to transmit, but the AFS2 pin TXE must be left
in the inactive (high) state.
4. Following the return of TXE to inactive (high), the AFS2 remains in transmit mode for another 15mS,
to allow the output of the radio to ramp down, before changing over to receive mode.
5. This unit requires a regulated +5v rail, during transmit, and during receive.
6. This version cannot be used with in i1200 modem mode, unless a separate means of driving the
TXE pin is provided. (see relevant application notes)
7. This is a 500mW output product. Good grounding (mount onto a groundplane and tack solder all can
walls to this), good quality aerials, properly mounted, and a low impedence power supply are
required if full performance is to be reliably obtained. If feasible, we recommend mounting the
module, and the board it is on, inside a metal enclosure, with the RF cable taken to a bulkhead
connector. All signal and power feeds should be filtered and/or decoupled.
Failure to observe these measures can cause modulation distortion ('recirculation' effects) or
instability. Also be aware of the effect that the strong RF fields generated by this device (and it's
aerial) can have upon other adjacent circuitry if this is not properly screened, filtered or otherwise
protected. Regulators, sensitive analogue circuitry, and microprocessors seem especially
interference prone.
Radiometrix Ltd.,
AFS2 data sheet
Page 2
Condensed specifications
Frequency
458MHz (standard)
Any 10MHz wide segment within 420-470MHz band
Transmitter
Output power
TX hold time
TX spurii
Receive path loss
Supply
500mW +/- 1dB
(250mW by special order)
15mS after TXE goes high
<-40dBm
<1dB (bi directional)
voltage
Current
Operating temperature
Size
Spurious radiations
Interface
User
RF Module
RF
+5V regulated
250mA transmit
<2mA receive (TXE high or floating)
°
°
-20 to +70 C (Storage -30 to +70 C)
33 x 23 x 9 mm
Compliant with ETSI EN 300 220-3 and EN 301 489-3
3 pin 0.1" pitch molex
3 pin 0.1" pitch molex
3 pin 0.1" pitch molex
Variants and ordering information
AFS2 is manufactured in the 458MHz as standard:
AFS2-458
Matching Transceiver:
TR2M-458-5-A (100mW, with TXE wire for modem operation)
TR2M-436.5-10-ARS (435MHz -438MHz Amateur Radio Satellite band Uplink usage)
Matching Transmitters
LMT2-458-10 (100mW)
TX2M-458-5 (100mW)
Other frequency variants can be supplied to individual customer requirements in the Any 10MHz
wide segment within 420-470MHz band.
Radiometrix Ltd.,
AFS2 data sheet
Page 3
Radiometrix Ltd
Hartcran House
231 Kenton Lane
Harrow, Middlesex
HA3 8RP
ENGLAND
Tel: +44 (0) 20 8909 9595
Fax: +44 (0) 20 8909 2233
[email protected]
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
[email protected]
European Radiocommunications Office (ERO)
Peblingehus
Nansensgade 19
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
[email protected]
www.ero.dk