Data Sheet - Radiometrix

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, 12 February 2013
SFX2
500mW NBFM Multi-channel UHF Transceiver
The SFX2 transceiver module offers a 500mW RF power
output in the UK 458MHz band. This makes the SFX2
ideally suited to those low power applications where
existing multi-channel narrow band devices like TR2M
have insufficient range.
Features
Figure 1: SFX2-458-5 transceiver
Conforms to EN 300 220-3 and EN 301 489-3
High performance double superhet, 255 channel PLL Synthesizer with TCXO
Data rates up to 5 kbps for standard module
Fast TX switching time (5ms typ.)
Usable range over 5km (@ 500mW)
Fully screened
Feature-rich interface (RSSI, automatic noise squelch, analogue and digital baseband)
User configurable via RS232 interface
Applications
Handheld terminals
Heavy vehicle/machine remote controls
EPOS equipment, barcode scanners
Data loggers
Industrial telemetry and telecommand
In-building environmental monitoring and control
High-end security and fire alarms
Vehicle data up/download
Technical Summary
Operating frequency: 458.5-459.1MHz UK (23 channels)
Up to 255 channels (8 parallel selected).
Transmit power: +27dBm nominal (adjustable 100 - 500mW)
Supply range: 6V - 9V (100% duty cycle), 6V – 15V (10% duty cycle)
Current consumption: 350mA transmit, 35mA receive
Data bit rate: 5kbps max. (standard module)
Receiver sensitivity: -118dBm (for 12 dB SINAD)
Size: 59 x 39 x 15mm
Evaluation platforms: NBEK + xx2M Series carrier
Radiometrix Ltd
SFX2 Data Sheet
page 1
Figure 2: SFX2 block diagram
Radiometrix Ltd
SFX2 Data Sheet
page 2
Figure 3: SFX2 Footprint (Top) view
Pin Description - SFX2
Pins
A1
A2
Name
Vcc
GND
Function
6V - 15V
Ground
B1
B2
B3
RF GND
RF
RF GND
RF ground
To the antenna
RF ground
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
TXE
TXD
AF in
RSSI
SQF
AF out
RXD
+5V out
0V
PGM
P1
P2
P3
Transmitter Enable. Low = ON, Open = RX mode. Internal 10kΩ pull-up to 5V
DC coupled digital data input for 3-12V CMOS logic. Leave open if unused
50mV - 2.5v p-p AC coupled input. Variable gain
DC level between 0.5V and 2.5V. 60dB dynamic range
Noise operated carrier detect. Open collector. ON/low = no signal
200mVpk-pk audio. DC coupled, approx 1V bias. Muted by squelch
Open collector output of data slicer suitable for Biphase codes
Regulated DC supply. 100mA max. drain. Present if unit is powered
Ground
Serial programming/configuration input at RS232 level
Parallel frequency select inputs. Inverted logic, internal 50kΩ pullups to 5V
Notes:
1. By changing specific links and components, either the rx and/or the tx path can be made to invert the
sense of the baseband waveform, or not. Standard issue SFX2 inverts on both tx and rx paths (so is
equivalent to a TR2I-458-5)
2. Carrier detect mutes the AF and DATA outputs. It can be disabled by either rotating the level set
trimmer fully ACW (disabling both) or by removing the solder link (which disables only the AF mute).
The carrier detect is relatively slow (approx 25mS) so is not compatible with the full sub 10mS tx/rx
switching speed capability of the unit
3. There is no pullup on the SQF open collector output. RXD has 47K to internal 5v
4. Unlike the parent TR2M, the SFX2 does not incorporate an i1200 modem
5. RS232 input (pin 10) tolerates true +/- levels. No buffering is required.
Radiometrix Ltd
SFX2 Data Sheet
page 3
Channel mapping
The SFX2 has a 255 channel capacity.
The first 32 channels are individually programmable (they have their own N register stores).
The remaining channels (32-255) constitute a sequential table
In serial mode the channel is selected by a GOCHAN xxx command
In parallel mode the lowest 8 channels are selected by the state of P1, P2, P3
SFX2 serial configuration commands
2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control
SINGLE
nnnnn
GOCHAN xxx
GOTEMP xxx
LOAD aa nnnnn
LOADTB nnnnn
LOADMX aaa
RVALUE rrrr
INCREM i
SETPAR
SETSER
DUMPEE
<cr>
/
Set value of N for single channel operation.
N value NOT stored in EEPROM
Serial select of channel aaa (ch0 to 255), store to EEPROM
Volatile version of GOCHAN
Set value of N for channel aa (channels 0 to 31)
Set value of N for channel 32 (channels 32 to 255 then in sequence)
Set highest permitted (serial selected) channel xxx (others default to ch0)
Set value for R register
Set increment value for sequential table (0-7)
Channel selected by 3 bit parallel input (ch0 to 7 only)
(Disable LOCKSM command)
Channel selected by most recent 'gochan' operation
Output entire EEPROM contents (128 unformatted bytes) using the P3 pin as an
output
Process entry
Clear all buffers
xxx = channel number from 0 to 255
aa = a two digit channel number from 00 to 31
nnnnn = a synthesizer N register value, (up to 65535)
rrrr = the synthesizer R register value, (up to 16383)
i = sequential table step value (0-7)
f RF − 21.4 MHz 458.525MHz − 21.4 MHz
=
= 17485
25kHz
25kHz
f TCXO
13MHz
R=
=
= 520 (usually )
f comparison frequency
25kHz
N=
Notes:
1. A pause of at least 50ms must be allowed between command strings (EEPROM programming time)
SINGLE mode does not store the N value in EEPROM. Therefore the unit is inoperative after a
power down until either another valid SINGLE command is received, or mode is changed by a
GOCHAN, SETPAR or SETSER command. SINGLE mode is intended for frequency agile
applications.
2. /SETPAR command should be issued at the end of channel programming to put the module back
into parallel frequency select mode
3. In 458MHz band, channel 12 (458.825MHz) and channel 15 (458.900MHz) are allocated specifically
for fixed alarm and radio keys/vehicle paging applications respectively and should not be used for
general purpose applications.
4. User can modify the frequency table of 128 channels to any desired frequency by changing N, R
values of synthesizer within ±2.5MHz of factory set Channel 0 frequency subject to the Radio
Regulatory Band Allocation in the country of intended use.
5. All other frequency, power, analogue input gain and automatic noise squelching adjustment will be
treated as custom variants of the module to be set by factory.
Radiometrix Ltd
SFX2 Data Sheet
page 4
Condensed specifications
Frequency
Frequency stability
Channel spacing
Number of channels
Supply
voltage
Current
458.5 - 459.1MHz (in UK allocation) as standard
Other UHF frequencies available on request
+/- 1.5kHz
25kHz (12.5kHz by special order)
255 channels controlled via RS232 interface (8 parallel selected)
6v - 9v (100% duty cycle)
6v - 15v (10% duty cycle)
5v regulated only version available
350mA nominal transmit
35mA receive
ο
ο
Operating temperature
Size
Spurious radiations
Interface
user
Power
RF
Recommended PCB hole size
13pin 0.1" pitch molex
2pin 0.1" pitch molex
3pin 0.1" pitch molex
1.2mm (min.)
Intended approval
ETSI Radio standard EN 300 220-3 and EMC standard EN 301 489-3
Transmitter
Output power
TX on switching time
Modulation type
Deviation
TX modulation bandwidth
Adjacent channel TX power
Inputs
Spurious radiations
+27dBm (500mW) ±1dB (factory adjustable 100 - 500mW)
5 ms nominal (sub 10ms guaranteed)
FM, FSK (F1D, F3D)
± 3kHz
DC – 3kHz
<-37dBm (<200nW)
analogue, data (CMOS/TTL compatible)
Compliant with ETSI EN 300 220-3 and EN 301 489-3
Receiver
Sensitivity
adjacent channel
image / spurious
blocking
Outputs
SFX2 timing
TXE low to TX full power
TXE high to valid data on RXD
RSSI attack/delay time
Carrier Detect response
-10 to +55 C (Storage -30 to +70 C)
59 x 39 x 15 mm
Compliant with ETSI EN 300 220-3 and EN 301 489-3
-118dBm for 12 dB SINAD
65dB
>70dB
85dB or better
RSSI, carrier detect, audio, data
5ms
5ms
<20ms
approx. 20 – 30ms (25ms typical)
Ordering information
Part No.
SFX2-458-5
Radiometrix Ltd
Frequency band
458.5-459.1MHz UK (23 channels)
SFX2 Data Sheet
Data rate (max)
5kbps
page 5
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://stakeholders.ofcom.org.uk/spectrum/technical/rtte/
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