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
TLM2-458-5
PRELIMINARY
Issue A, 08th October 2009
NBFM Multi-channel 500mW UHF Transmitter
The TLM2 transmitter module offers a
500mW RF output in the UK 458MHz. This
unit is ideally suited to applications where
existing lower powered transmitters
provide insufficient range. The TLM2
transmitter is a multi-channel, narrowband
design, suitable for licensed and
unlicensed UHF allocations. Together with
a matching LMR2 receiver a one-way radio
data link can be achieved over a distance
of well over 5km (with a suitable antenna).
Figure 1: TLM2-458-5
Features
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Conforms to EN 300 220-3 and EN 301 489-3
PLL Synthesized transmitter with TCXO
Data rates up to 5 kbps for standard module
Usable range over 5km
Fully screened
User configurable via RS232 interface
Low power requirements
Applications
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Handheld terminals
On-site paging system (e.g. Nurse call pagers)
Heavy vehicle/machine remote controls
Data loggers
Industrial telemetry and telecommand
High-end security and fire alarms
Vehicle data up/download
Technical Summary
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Operating frequency: 458.525 - 459.1MHz (standard)
or 458.8 - 459.3MHz and 461.3MHz (for paging)
32 channels
Transmit power: +27dBm (500mW) nominal
Supply range: 6V - 9V
Current consumption: 350mA transmit, <5µA standby
Data bit rate: 5kbps max. (standard module)
Size: 74 x 38 x 14 mm
Radiometrix Ltd
TLM2 Data Sheet
page 1
Figure 2: TLM2 block diagram
Radiometrix Ltd
TLM2 Data Sheet
page 2
Figure 3: TLM2 Footprint (Top) view through can
User Interface
Pin description
Pin
1a
2a
3a
4a
Name
Vcc
0V
TXE
TXD
Function
6-9v DC supply (15v max). 350mA max. current drain
Ground
Transmitter enable. Low = ON, open = off. 100K pullup to raw Vin
DC coupled input for 3V CMOS logic. Rin=47kΩ
1b
P0/PGM
Serial programming / control input (inverted logic level rs232)
2b
P1
'Transmitter in-lock' output (active high)
3b
P2
No connection
4b
P3
Serial output (inverted logic level rs232)
Notes:
1. No 'modem version' is available
2. A version with a simplified (16/32 channel, parallel select) user interface identical to the LMT2, is
available
3. A remote control 'actuator' software version is available, compatible with the LMR2-CX
4. P0 input has a 50K pullup to internal 4v rail
5. An ancillary connector (PGM) is provided to allow direct connection of an RS232 (non-inverted, true
levels) port via a 3 pin 0.1" pitch connector, for limited in-circuit re-programming by PC. This
connector does not provide a 'read back' output.
6. Continuous transmission at input voltages above 9v is not recommended, unless forced air (fan)
cooling is provided. If duty cycle can be kept low, and the length of transmission minimised, then up
to 15v can be used
7. This is a 500mW output product. Good grounding , good quality aerials, properly mounted, and a low
impedance 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
connector exiting through a bulkhead. 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.
8. This design uses a version of the LMT2 100mW transmitter, and the AFS2 500mW power amplifier
module
Radiometrix Ltd
TLM2 Data Sheet
page 3
Serial interface commands
The internal firmware for TLM2 has two versions.
Version 1 is IDENTICAL to our standard LMT2-458-5 (100mW) in all respects
Version 2 is specific to paging applications.
Version 1: programming instruction
2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits.
Serial data is sent to the unit on one of the parallel channel select pins (P0). It is very important that the unit
does not 'decode' switch bounce in ordinary operation as a command string, or spurious re-writing of the
e2prom will result. For this reason the user must send the 16 character string ENABLESERIALMODE
(followed by a carriage return) to activate the serial command mode before sending any of the command
strings listed below. Command mode is disabled on power down, or on reception of a # character. To
successfully program the unit, it must be enabled ('RXE high (rx) or TXE low (tx)).
GOCHAN aa
LOAD aa nnnnn
SETPAR
SETSER
RVALUE rrrr
SINGLE nnnnn
Serially select channel aa, where aa is ch0 to ch31
Set value of N register for channel aa, where aa is Channels 0 to 31
Channel selected by 4 bit parallel inputs (ch0 to ch15 only)
Channel selected by most recent GOCHAN operation
Set value for R register
Set value of N for single channel operation.
N value NOT stored in EEPROM
Process entry
Clear all buffers
Disable command mode
<cr>
/
#
aa = a two digit channel number from 00 to 31
nnnnn = synthesizer N register value (up to 65535)
rrrr = synthesizer R register value (up to 16383)
N=
R=
Note:
f RF
f Channelspacing
f TCXO
f channelspacing
=
=
458.525 MHz
= 18341
25kHz
13MHz
, So R=520
25kHz
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.
Radiometrix Ltd
TLM2 Data Sheet
page 4
Version 2: programming instruction
The TLM2 provides 32 individually programmable channels
(As supplied, CH00-CH20 are programmed to 458.8 - 459.3MHz, and channels 21-31 are all set to
461.3MHz)
GOCHAN aa
TEMP aa
Serially select channel aa, where aa is ch0 to ch31
select channel aa, but revert to last GOCHAN value on next key-up
LOAD aa nnnnn
RVALUE rrrr
Set value of N register for channel aa, where aa is Channels 0 to 31
Set value for R register
<cr>
/
Process entry
Clear all buffers
aa = a two digit channel number from 00 to 31 (and it MUST be two digits, so use "01" instead of "1".etc)
nnnnn = synthesizer N register value (up to 65535)
rrrr = synthesizer R register value (up to 16383)
N=
R=
f RF
f Channelspacing
f TCXO
f channelspacing
=
=
458.800 MHz
= 18352
25kHz
13MHz
, So R=520
25kHz
Notes:
1. A 2400 baud cmos level ‘inverted RS232 format’ (1 start bit, 8 data, 1or 2 stop bits, no parity) is
used.
2. The unit echos all bytes sent back on the P3 output.
Following any successful operation, the bytes OK <cr> are also sent back, when the unit is ready.
3. To successfully program the unit it must be in active state (txe low), so provision should be made to
force the unit into this state while programming (the third pin on the auxiliary programming connector
does this).
4. All commands except the non-volatile TEMP aa initiate an e2prom programming sequence. 50mS
must be left before the next command is sent.
5. These units employs a sub-set of the programming commands used by standard LMT module. (As
the P0 pin is dedicated to serial communication only, the ‘ENABLESERIALMODE’ command string is
NOT required.)
Radiometrix Ltd
TLM2 Data Sheet
page 5
Condensed specifications
Frequency
Frequency stability
Channel spacing
Number of channels
Transmit
Output power
TX on switching time
Modulation type
TX modulation bandwidth
Adjacent channel TX power
TX spurri
Spurious radiations
Inputs
As supplied:
Version 1: 458.525 - 459.1MHz (25kHz steps)
Version 2: 458.8 - 459.3MHz (25KHz steps) and 461.3MHz
+/- 1.5kHz
25kHz
32 channels controlled via RS232 interface
+27dBm (500mW) ±1dB
50 ms from TXE transition
FSK (F3D)
DC – 3kHz (3v CMOS compatible DATA input)
<-37dBm
<-40dBm (no output in standby)
Compliant with ETSI EN 300 220-3 and EN 301 489-3
data (CMOS/TTL compatible)
Voltage
Current
+6 to 9v (6-15v for intermittent operation)
350mA nominal transmit
<5µA standby (TXE high or floating)
User
Recommended PCB hole size
Size
4+4 pin 0.1" pitch DIL header, plus 3 x 3pin 0.1" pitch SIL 'mounting'
headers (PGM)
BNC (bulkhead type)
A 2mA LED indicator may be fitted by the user. A 1K series resistor
(from 5.3v) is provided
1.2mm (min.)
74 x 38 x 14mm (not including connectors, which increase the length)
Operating temperature
Intended approval
-20 to +55 C (Storage -30 to +70 C)
ETSI Radio standard EN 300 220-3 and EMC standard EN 301 489-3
Supply
Interface
RF
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Ordering Information:
Part No.
Frequency band
TLM2-458-5 (version 1)
TLM2-460-5 (version 2)
458.525 - 459.1MHz
458.8 - 459.3MHz and 461.3MHz
Matching Receiver
LMR2-458-5 (version 1)
LMR2-460-5 (version 2)
Radiometrix Ltd
458.525 - 459.1MHz
458.8 - 459.3MHz and 461.3MHz
TLM2 Data Sheet
page 6
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