Data Sheet

W
E
N
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Issue A, 25 February 2008
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
TR1M
Narrow Band FM MultiMulti-channel VHF Transceiver
The TR1M narrow band multi channel
transceiver module is intended as a general
purpose VHF data communication unit. It is
available on any frequency between 135 and
175MHz (in 3MHz bands) and delivers up to
100mW RF output. This transceiver offers a
low power, reliable data link in an industry
standard footprint. For added flexibility it
shares a common pinout with the UHF TR2M
module.
Figure 1: TR1M-151-5 VHF transceiver
Features
Conforms to EN 300 220-3 and EN 301 489-3
Any 3MHz band module from 135MHz to 175MHz available as factory tuned custom variant
High performance double superhet, 128 channel PLL Synthesizer with TCXO
Data rates up to 5 kbps for standard module
Usable range over 1km (with 100mW variant)
Fully screened
Feature-rich interface (RSSI, automatic noise squelch, analogue and digital baseband)
Incorporates a 1200baud dumb modem
User configurable via RS232 interface
Low power requirements
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
Size: 59 x 38 x 12mm
Custom variants from 135MHz to 175MHz on any 3MHz band (Available on the UK 173.2MHz 173.325MHz 10mW band)
128 serial select or 8 parallel select channels
Transmit power: +20dBm (100mW) nominal
Supply range: 4.5V - 16V
Current consumption: 110mA transmit (@100mW), 27mA receive
Data bit rate: 5kbps max. (standard module)
Receiver sensitivity: -118dBm (for 12 dB SINAD)
Radiometrix Ltd
TR1M Data Sheet
page 1
Figure 2: TR1M block diagram
Radiometrix Ltd
TR1M Data Sheet
page 2
59mm
2.7mm
3.1mm
A
1
8.9 mm
Squelch adj.
33mm
1 Vcc
2 Gnd
1 RF Gnd
2 RF in
3 RF Gnd
1 TXE (MOD TX_ON)
2 TXD (MOD NC)
3 AF in (MOD NC)
4 RSSI
5 SQF (MOD NC)
6 AF out
7 RXD (MOD NC)
8 +4.4V out
9 0V
10 PGM
11 P1 (MOD TXD)
12 P2 (MOD RXD)
13 P3 (MOD NC)
38.5mm
A:
A:
B:
B:
B:
C:
C:
C:
C:
C:
C:
C:
C:
C:
C:
C:
C:
C:
Input gain.
B
1
C
53.3mm
Unit height
12mm
Figure 3: TR1M Footprint (Top) view
Pin Description - TR1M
Pins
A1
A2
Name
Vcc
GND
Function
4.5V-16V
Ground
B1
B2
B3
RF GND
RF
RF GND
RF ground
To the antenna
RF ground
C1
C2
C3
TXE (MOD TX_ON)
TXD (MOD NC)
AF in (MOD NC)
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
RSSI
SQF (MOD NC)
AF out
RXD (MOD NC)
+4.4V out
0V
PGM
P1 (MOD TXD)
P2 (MOD RXD)
P3 (MOD NC)
Transmitter Enable. Low = ON, Open = RX mode. Internal 10kΩ pull-up to 4V
DC coupled digital data input for 3-12V CMOS logic. Leave open if unused
50mV - 2.5v p-p AC coupled input. Variable gain. Factory set to 1Vpk-pk ±10% to
keep distortion <1.5% and peak deviation >2.5kHz.
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. 75mA max. drain. Present if unit is powered
Ground
Serial programming/configuration input at RS232 level
Parallel frequency select inputs. Inverted logic, internal 10kΩ pullups to 4V
Notes:
1. TR1M receiver section inverts the sense of the baseband stream, so a logical inversion is present
between input of TX and output of RX.
2. Carrier detect on TR1M mutes the AF Out and RXD outputs. It can be factory disabled.
3. All the open collector outputs must be connected to Vcc/+4.4V out via a pull-up resistor.
4. The software incorporates a 1200baud dumb modem, compatible with that implemented in
SMX1, UHX1, NBEK, TX1M, RX1M radios (I1200 tones and format)
5. With 1200baud modem mode enabled, parallel selection of channel is unavailable as the P1-P3
lines are used for modem input/output operations.
6. PGM and MOD TXD (pin 10 and 11) tolerate true ±RS232 levels. No buffering is required.
7. For UK version the following channel assignment is supplied:
Channel
0
1
2
3
4-7
8 - 127
Radiometrix Ltd
Frequency (MHz)
173.250
173.275
173.300
173.325
173.225 (only used for alarm applications)
173.325
TR1M Data Sheet
page 3
TR1M serial configuration commands
2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control
SINGLE
GOCHAN
LOADMX
LOAD aa
LOADTB
RVALUE
SETPAR
SETSER
SETMOD
nnnnn
xx
xx
nnnnn
nnnnn
rrrr
OFFSET ooo
<cr>
/
Set value of N for single channel operation
Serial select of channel xx (0 to 127)
Set highest permitted (serial selected) channel xx (others default to ch0)
Set value of N for channel aa (channels 0 to 15)
Set value of N for channel 16 (channels 17 to 127 then in sequence)
Enter value for R register
Channel selected by 3 bit parallel input (0 to 7). Disable modem
Channel selected by most recent 'gochan' operation
Enable internal modem. Frequency selected by most recent 'gochan' or
'single'
Set receive frequency offset (for 25KHz this is 856)
Process entry
Clear all buffers
xx = channel number from 00 to 127
aa = two digit channel number from 00 to 15
nnnnn = synthesizer N register value, (up to 65535)
rrrr = synthesizer R register value, (up to 16383)
000 = frequency offset
N =
f RF
173.200 MHz
=
= 6928
25kHz
 10 Mhz 


 R 
R=
f TCXO
f channelspacing
=
10 MHz
, So R=400
25kHz
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 173MHz band, channel 4- 7 (173.225MHz) is allocated specifically for fixed alarm 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 ±1.5MHz 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
TR1M Data Sheet
page 4
Pin description of TR1M with Modem mode selected
The 'modem' mentioned is a 1200 baud RS232 semi-intelligent unit (Transmit keyed when valid serial data is
present, so no separate TX control needed. Coding in the datastream also permits the receiver to ignore noise
and only output valid serial data). This is a half duplex unit, so collisions between transmitted and received
packets must be dealt with by the user.
Pins
1
2
3
4
5
6
7
8
9
10
11
12
13
Name
MOD TX_ON
MOD NC
MOD NC
RSSI
MOD NC
AF out
Function
Open = normal modem operation. Low = constant TX (for test). 10k pullup to 4V
Leave open
Leave open
DC level between 0.5V and 2.5V. 60dB dynamic range
Leave open
Modem tones or noise present
Leave open
Regulated DC supply. 75mA max. drain. Present if unit is powered
Ground
NC
+4.4V out
0V
PGM
MOD TXD
MOD RXD
CDE
Serial programming/configuration input at RS232 level
RS232 data input (true). 10k pullup to 4V
Inverted RS232 data out (to inverting buffer like MAX232)
Pull low to enable carrier detect on receive operation (not recommended)
TR1Ms on both ends should be configured to required operating frequency using GOCHAN
command before starting to use the internal 1200 baud modem, because the P1-P3 pins will be used
as Modem Data pins and the modem will operate on the last serially selected channel after
SETMOD command is used to enable the Modem.
TXE (MOD TX_ON) (C1)
TXD (MOD NC) (C2)
AF in (MOD NC) (C3)
RSSI (C4)
TR1M
SQF (MOD NC) (C5)
AF out (C6)
Serial COM Port
RXD (MOD NC) (C7)
+4.4V out (C8)
GND (C9)
PGM (C10)
P1 (MOD TXD) (C11)
P2 (MOD RXD) (C12)
SW1
VDD
6
1
2
7
3
8
9
P3 (MOD NC) (13)
RXD
TXD
4
5
SGD
RS232 driver
Figure 4: TR1M interfaced to PC serial port in modem mode
Note:
Baud rate used for Modem is half that of used for serial configuration. Attached RS232 devices
should be set with the following:
1200bps, 8 Data bits, No Parity, 1/2 stop bits, no flow control
TXD (Pin 3) of a Serial Port can be switched from PGM (Pin C10) to MOD TXD (Pin C11) with no
RS232 driver in between. However, MOD RXD (Pin C12) requires an RS232 line driver before it
can be connected to RXD (pin 2) of a serial port. Some of the RS232 line drivers can be powered
from the regulated +4.4V out (Pin C8).
Radiometrix Ltd
TR1M Data Sheet
page 5
Condensed specifications
Frequency
Frequency stability
Channel spacing
Number of channels
Any 3MHz band from 135 - 175MHz
+/- 1.5kHz
25kHz (12.5kHz by special order)
128 channels controlled via RS232 interface (8 parallel selected)
Supply
4.5-16V
Transmit: 110mA nominal @ 100mW (55mA nominal @ 10mW)
Receive: 27mA
voltage
Current
Operating temperature
Size
Spurious radiations
Interface
user
Power
RF
-10 to +60 οC (Storage -30 to +70 οC)
59 x 38 x 12 mm
Compliant with ETSI EN 300 220-3 and EN 301 489-3
Recommended PCB hole size
1.2mm (min.)
Intended approval
ETSI Radio standard EN 300 220-3 and EMC standard EN 301 489-3
13pin 0.1" pitch molex
2pin 0.1" pitch molex
3pin 0.1" pitch molex
Transmitter
Output power
TX on switching time
Modulation type
TX modulation bandwidth
Adjacent channel TX power
Inputs
+20dBm (100mW) ±1dB (factory adjustable 1-100mW)
50 ms
FM, FSK (F1D, F3D)
DC – 3kHz
-37dBm
analogue, data (CMOS/TTL compatible)
Receiver
Sensitivity
image / spurious
blocking
adjacent channel
Outputs
Power on to valid audio (no noise mute)
Power on to valid audio (with noise mute)
Power on to stable data out (50:50 mark / space)
-118dBm for 12dB SINAD
-70dB
-85dB
<-65dB (Tested per. ETSI EN 301 489-3
RSSI, carrier detect, audio, data
28ms
45ms
50ms (with or without mute)
Notes: 1. The data slicer cannot be depended upon for data waveform frequencies below 250Hz
2. When RX is on and a transmitter keys up, again a 50ms period is required to stabilise data output
mark/space. i.e. allow at least 50ms of preamble
Radiometrix Ltd
TR1M Data Sheet
page 6
Application information
TXE (MOD TX_ON) (C1)
AF in (MOD NC) (C3)
RSSI (C4)
ADC
AF out (C6)
RXD (MOD NC) (C7)
+4.4V out (C8)
GND (C9)
PGM (C10)
P1 (MOD TXD) (C11)
P2 (MOD RXD) (C12)
P3 (MOD NC) (13)
1kΩ
TR1M
SQF (MOD NC) (C5)
Carrier Detect
Data In
10kΩ
100nF
VDD
Parallel
Channel
Select
6
7
8
9
1
2
3
TXD
4
5
SGD
PC serial port
Data Out
Host Microcontroller
Transmit Enable
TXD (MOD NC) (C2)
Figure 5: TR1M interfaced to host microcontroller and serial port for configuration
TR1M can be directly interfaced to a host microcontroller which can generally be powered by the
regulated +4.4V output on pin 8 of TR1M. Three I/O pins on the microcontroller port can be assigned to
select the first 8 channels on frequency table of the appropriate band for which the module is configured
by pulling the P1-P3 pins low. Channel select pins of TR1M have internal pull-up to 4V supply rail,
hence channel selection operate on inverted logic.
Digital Received Data Output (RXD) pin is an open collector output, which should be pulled-up to
required voltage swing level (e.g. +4.4V or Vcc).
TR1M has an automatic noise squelching function which is activated when there is not any RF signal at
detectable level on the channel or if the non-coherent noise like interference level is high enough to
block any weak RF signal from being received. SQF is provided as an open-collector output for
monitoring which should be pulled-up to required voltage swing level. SQF output will jump to pull-up
voltage level if received RF signal level at the RF In/Out pin of the module is about 3dB below the level
required to produce 12dB SINAD level on demodulated AF Output signal. SQF pin can be connected to
an LED to act as a Carrier Detect indicator. Pull-up resistor value should be reduced (e.g. 1kΩ)
according to the current requirement to produce satisfactory brightness on the LED used.
TR1M can be configured using any PC/Laptop/PDA having a serial port and modem/terminal program.
TXD (pin 3) of DB9M connector can be directly wired to PGM (pin C10) of the TR1M and SGN (pin 5) of
DB9M connector should be either connected to common ground or pin C9 of the TR1M.
The whole frequency/channel table is user reconfigurable to 128 channels within 3MHz band of supplied
frequency subject to regulatory band limits.
Radiometrix Ltd
TR1M Data Sheet
page 7
Received Signal Strength
2.5
2.3
2.1
RSSI output (V)
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
RF Level (dBm)
Figure 6: Typical RSSI voltage variation with respect to RF level at TR1M
If the microcontroller has a built-in Analogue to Digital Converter (ADC), the Received Signal Strength
Indicator (RSSI) output voltage level can be read by the microcontroller to estimate its distance from
transmitting TR1M unit or identify areas of weak signal reception.
RSSI can also be used to make a decision to switch to the second antenna in fixed installations within
building where the probability of null-spots are higher.
Radiometrix Ltd
TR1M Data Sheet
page 8
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://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
information.requests@ofcom.org.uk
European Radiocommunications Office (ERO)
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Nansensgade 19
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
ero@ero.dk
www.ero.dk