Data Sheet(pdf)

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
HMT2-458-5
PRELIMINARY
Issue 1, 31th March 2016
NBFM Multi-channel 500mW UHF Transmitter
The HMT2 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 HMT2
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: HMT2-458-5
Features
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
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
Operating frequency: 458.525 - 459.1MHz (standard)
or 458.8 - 459.3MHz and 461.3MHz (for paging)
16 parallel / 32 serial select channels
Transmit power: +27dBm (500mW) nominal
Supply range: +5V regulated (or +6 - +9V for -R version)
Current consumption: 350mA transmit, <5µA standby
Data bit rate: 5kbps max. (standard module)
Size: 66 x 23 x 9 mm
Radiometrix Ltd
HMT2 Data Sheet
page 1
Figure 2: HMT2 block diagram
Radiometrix Ltd
HMT2 Data Sheet
page 2
Figure 3: HMT2 Footprint (Top) view through can
User Interface
Pin description
Pin
1a
2a
3a
4a
5a
6a
Name
Vcc
0V
0V
0V
RF input
0V
Function
5v regulated power supply (high current feed)
Ground
Ground
Ground
50Ω RF input from the antenna
Ground
1b
P0/PGM
Channel select LSB / Serial programming (inverted logic level rs232)
2b
P1
Channel select
3b
P2
Channel select
4b
P3
Channel select MSB
5b
Vcc
5v input (low current feed)
6b
0V
Ground
7b
TXE
Transmitter enable. Low = ON, open = off. 100K pullup to Vcc
8b
TXD
DC coupled input for 3V CMOS logic. Rin=47kΩ
Notes:
1. Serial programming is by an inverted, cmos logic level, 2400 baud RS232 datastream applied to the
P0 pin.
2. Channel select inputs have pullups (50K) to 4v internal rail. Do not exceed 4v logic levels on this
port.
3. Channel select inputs are active low
4. TXE has a 100K pullup to Vcc
5. All pins are on an 0.1" grid
6. Pin 1a supplies the power amplifer. This pin requires a clean, well regulated 5v supply at up to
300mA
Pin 5b supplies the remainder of the module. It can tolerate 4.1-9v and draws up to 100mA
7. A version of the design is available with an LDO regulator in the PA feed.
In this case pin 1a can be supplied from a 6-9v rail too
8. Pinout is compatible with FPX3, SHX1 and UHX1 transceivers, although the case is narrower and
the pins associated with receive functionality are absent.
Radiometrix Ltd
HMT2 Data Sheet
page 3
Serial interface commands
The internal firmware for HMT2 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 fully enable 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, n_txe must be 'low' (active) to enable the unit.
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
HMT2 Data Sheet
page 4
Version 2: programming instruction
The HMT2 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
HMT2 Data Sheet
page 5
Condensed specifications
Frequency
As supplied:
Version 1: 458.525 - 459.1MHz (25kHz steps)
Version 2: 458.8 - 459.3MHz (25KHz steps) and 461.3MHz
+/- 1.5kHz
25kHz
16 channels controlled by parallel port
32 channels controlled via RS232 interface
Frequency stability
Channel spacing
Number of channels
Transmit
Output power
TX on switching time
Modulation type
TX modulation bandwidth
Adjacent channel TX power
TX spuri
Spurious radiations
Inputs
Supply
+27dBm (500mW) ±1dB
30 ms from TXE transition
FSK (F3D)
DC – 3kHz (3v CMOS compatible DATA input)
<-37dBm
<-36dBm (no output in standby)
Compliant with ETSI EN 300 220-3 and EN 301 489-3
data (CMOS/TTL compatible)
Voltage
Current
+5V regulated (or 6-9V in –R version)
350mA nominal transmit
<5µA standby (TXE high or floating)
User
RF
8 pin 0.1" pitch single row header
6 pin 0.1" pitch
Interface
Recommended PCB hole size
Size
1.2mm (min.)
66 x 23 x 9mm
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
ο
ο
Ordering Information:
Part No.
Notes
Frequency band
HMT2-458-5
HMT2-460-5
HMT2-458-5-R
HMT2-460-5-R
version 1
version 2
version 1; regulator version
version 2; regulator version
458.525 - 459.1MHz
458.8 - 459.3MHz and 461.3MHz
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
HMT2 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
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