500mW Multi-channel 4800 baud Radio Modem

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
Issue 1, 11 June 2012
500mW Multi-channel 4800 baud Radio Modem
The GJX2 is a high power 4800 baud
radio modem with on board
microcontroller for user proprietary
control firmware. The wireless RF link is
carried over a fast-switching
multichannel 458MHz narrowband
transceiver, capable of 500mW RF power
Figure 1: GJX2-458-4
 Conforms to EN 300 220-3 and EN 301 489-3
 High performance double superhet Low noise PLL Synthesizer with TCXO
 Data rate is 4800 baud over the radio link
 Usable range over 5km
 Fully screened
 User configurable via RS232 interface
 Low power requirements
 Heavy vehicle/machine remote controls
 EPOS equipment, barcode scanners
 Data loggers
 Industrial/commercial telemetry and telecommand
 In-building environmental monitoring and control
 High-end security and fire alarms
 Vehicle data up/download
Technical Summary
 Operating frequency: 458.525-459.1MHz
 Custom variants from 420MHz to 480MHz on any 5MHz band
 Up to 32 channels max.
 Transmit power: +27dBm (500mW) nominal
 Transmit switching time: 5ms (max)
 Supply range: 6V - 15V
 Current consumption: 400mA transmit, 50mA receive
 Data bit rate: 5kbps max. (standard module)
 Receive sensitivity is -115dBm for 0.1% data errors (12dB SINAD is -118dBm)
 Dimension: 119mm x 64mm x TBAmm
Radiometrix Ltd
GJX2 Data Sheet
page 1
Condensed specifications
458.525 - 459.1MHz (any 5MHz band from 420-480MHz)
VHF version TBA
± 1.5kHz
25kHz or 12.5kHz
32 channels controlled via RS232 interface
Frequency stability
Channel spacing
Number of channels
Output power
TX on switching time
Modulation type
Adjacent channel TX power
+27dBm (500mW) ±1dB
<10 ms
FSK (F1D, F3D)
± 3kHz
image / spurious
adjacent channel
Spurious radiations
-115dBm for 12 dB SINAD
<-65dB (Tested per. ETSI EN 300 086)
Compliant with ETSI EN 300 220-3 and EN 301 489-3
6V - 15V DC (+5V regulated version available)
400mA nominal transmit
50mA receive
3 way terminal block or 4 pin header for 3-wire UART
(Inverted RS232 at 5V TTL level) interface
Optional RS485
2 way 3.5mm terminal block
BNC connector
Operating temperature
Intended approval
Radiometrix Ltd
119mm x 64mm x TBA mm
-20 to +55 οC
-30 to +70 οC
(Storage -30 to +70 οC)
ETSI Radio standard EN 300 220-3 and EMC standard EN
301 489-3
FCC part 90 compliance
GJX2 Data Sheet
page 2
Radiometrix Ltd
Hartcran House
231 Kenton Lane
Harrow, Middlesex
Tel: +44 (0) 20 8909 9595
Fax: +44 (0) 20 8909 2233
[email protected]
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
Further details are available on The Office of Communications (Ofcom) web site:
Information Requests
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Tel: +44 (0)300 123 3333 or 020 7981 3040
Fax: +44 (0)20 7981 3333
[email protected]
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Tel. +45 33896300
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