LMT0-27-4 [RADIOMETRIX]
27MHz HF Narrow Band FM multi channel radio modules;
| 型号： | LMT0-27-4 |
| 厂家： | 
RADIOMETRIX LTD |
| 描述： | 27MHz HF Narrow Band FM multi channel radio modules |
| 文件： | 总10页 (文件大小：105K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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 4, 5 August 2014
27MHz HF Narrow Band FM multi channel radio modules
The LMT0 transmitter and LMR0 receiver
modules offer a 10kHz channel spacing
multi channel, low power, and reliable HF
data link. This makes the LMT0/LMR0 pair
ideally suited to those low power
applications where existing wideband
modules have insufficient range, or where
low cost multi-channel operation is
needed without compromising on RF
specification or regulatory requirement.
Figure 1: LMT0 transmitter and LMR0 receiver
Features
. Conforms to EN 300 220-2 and EN 301 489-3
. High performance double superhet. PLL synthesizer with TCXO
. 6 channels (standard). Up to 16 parallel select or 32 serial select channels
. quasi-dc (peak sampling) data recovery circuit (for enhanced performance on unbalanced
datastreams)
. Data rates up to 4 kbps for standard module
. Usable range over 1km
. Fully screened. Low profile
. Feature-rich interface (RSSI, analogue and digital baseband)
. Re-programmable via UART interface
. Low power requirements
Applications
. Radio Control (R/C) Radio Service under FCC Part 95 subpart C
. Radio model control
. Telemetry and telecommand
. Wireless door entry systems
. Simple On/Off switching
. In-building environmental monitoring and control
. Security and fire alarms
. Vehicle/machinery controls
Technical Summary
. Frequencies:
10mW 26.957-27.283MHz Non-specific Short Range Devices (SRD)
100mW 26.995, 27.045, 27.095, 27.145, 27.195, 27.255MHz Remote control
Any 0.5MHz wide sub-band in 26-28MHz
. Transmit power:
. Receiver sensitivity:
. Supply range:
.
+10dBm (10mW) @ 4.1V; +20dBm (100mW) version also available
-115dBm (for 12 dB SINAD)
4.1V – 15V Transmitter
3.1V – 15V Receiver
. Current consumption: 40mA @ 10mW Transmit; 100mA @ 100mW Transmit
20mA Receive
. Data bit rate:
4kbps max.
Evaluation platforms: NBEK + LM Series carrier
Radiometrix Ltd
LMT0/LMR0 Data Sheet
page 1
Radiometrix Ltd
LMT0/LMR0 Data Sheet
page 2
Figure 3: LMT0 footprint (top view)
Pin description – LMT0
Pin
1a
2a
3a
4a
5a
Name
Vcc
0V
TXE
TXD
No pin
Function
4.1V – 15V power supply
Ground
Transmit Enable (active low)
DC coupled input for CMOS logic. Rin=47k
Not present in LMT0
1b
P0/PGM
Parallel Channel select LSB
Serial frequency programming / configuration1
Parallel Channel select
Parallel Channel select
Parallel Channel select MSB
Not present in LMT0
2b
3b
4b
5b
P1
P2
P3
No pin
Notes:
1. Serial programming is by an inverted, CMOS logic level, 2400 baud UART data stream applied to
the PGM pin.
2. Channel select inputs have pull-ups (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 pull-up to Vcc
5. All pins are on an 0.1" grid
6. The pins 5a/b are not present, but are included in footprint for compatibility with other units in this
family
Radiometrix Ltd
LMT0/LMR0 Data Sheet
page 3
Radiometrix Ltd
LMT0/LMR0 Data Sheet
page 4
Figure 5: LMR0 footprint (top view)
Pin description – LMR0
Pin
1a
2a
3a
4a
5a
Name
Vcc
0V
RXE
RXD
AF out
Function
3.1 – 15V power supply
Ground
Receiver Enable (active high)
Data out (open collector, no pull-up)
600mV p-p audio. DC coupled, approx 0.8v bias.
1b
P0/PGM
Parallel Channel select LSB
Serial frequency programming / configuration1
Parallel Channel select
2b
3b
4b
5b
P1
P2
P3
RSSI
Parallel Channel select
Parallel Channel select MSB
DC level between 0.5v and 2.2v. 60dB dynamic range
NOTES:
1. Serial programming is by an inverted, cmos logic level, 2400 baud UART data stream applied to the
P0 pin.
2. Channel select inputs have pull-ups (50k) to 3V internal rail. Do not exceed 3V logic levels on this
port.
3. Channel select inputs are active low
4. All pins are on an 0.1" grid
5. Unit will operate (with marginally reduced specifications) from a 3.0v rail. This must be well regulated
and without noise or ripple, as in this state the unit's internal regulator no longer operates, and
provides no supply rejection.
6. A quasi-DC data extractor is provided, to better deal with mark - space errors in simple coder
schemes
7. Compared to a standard LMR, the AF output has the opposite 'sense'.
Data output polarity is, however, the same.
Radiometrix Ltd
LMT0/LMR0 Data Sheet
page 5
Serial interface commands
2400 baud UART. 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)).
The LMT0 / LMR0 modules are supplied in one of two possible software versions, depending on the
frequency table setup. The usual load-out (used for the default 6 channel “radio control” version) is the eight
channel version described below. If a 32 channel unit has been ordered, then these radios will be supplied
programmed with the standard LMT1 / LMR1 software, and are programmed using the commands detailed in
those data sheets
The 8 channel LM series software is a little unusual, in that it provides a unique R divider value for each
channel, rather than storing a single value common to all. This in turn allows the use of comparison
frequencies higher than the 5kHz that would otherwise be necessary to set up the FCC specified frequencies
(a comparison frequency below 10kHz will result in unacceptably slow PLL setting, and compromised
switching speed)
Unfortunately, the mathematics necessary to generate the relevant N / R values is somewhat involved, and
most users will be unlikely to need to reprogram the channel table. Further information can be obtained from
Radiometrix, if needed.
GOCHAN a
SETPAR
SETSER
RVALUE rrrr
SINGLE nnnnn
a Serially select channel a, where a is ch0 to ch7
Channel selected by 4 bit parallel inputs (ch0 to ch7)
Channel selected by most recent GOCHAN operation
R register value used for SINGLE operation (only)
Set value of N for single channel operation.
N value NOT stored in EEPROM
<cr>
Process entry
/
Clear all buffers
#
Disable command mode
a = one digit channel number, from 0 to 7
nnnnn = synthesizer N register value (up to 65535)
rrrr = synthesizer R register value (up to 16383)
Frequency table programming commands are as follows:
LDTXN a nnnnn
LDTXR a nnnnn
LDRXN a nnnnn
LDRXR a nnnnn
Set value of N register for channel a (LMT0 only)
Set value of R register for channel a (LMT0 only)
Set value of N register for channel a (LMR0 only)
Set value of N register for channel a (LMR0 only)
Notes:
1. A pause of at least 50ms must be allowed between command strings (EEPROM programming time)
2. In 'SINGLE' mode 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.
3. When calculating the PLL operating frequency Fc = F(ref) x N / R, please note that the LMT0 has a
10MHz reference, while the LMR0 uses 13MHz
4. Unlike most other Radiometrix receivers, the LMR0 design places the local oscillator 21.4MHz
ABOVE the channel frequency. N value must be calculated accordingly
Radiometrix Ltd
LMT0/LMR0 Data Sheet
page 6
Default Transmitter and Receiver N, R values
Frequency
26.995MHz
27.045MHz
27.095MHz
27.145MHz
27.195MHz
27.255MHz
TXN
1069
1144
970
1816
1716
834
TXR
396
423
358
669
631
306
RXN
2658
2303
1854
2782
3996
2560
RXR
714
618
497
745
1069
684
fVCTCXO
TXR
10MHz
fcomp
27.932961kHz
Comparison Frequency (fcomp) >10kHz
358
RF
27.095MHz
TXN
970
fcomp 27.932961kHz
48.495MHz (LO) = 27.095MHz (RF) + 21.4MHz (IF)
fVCTCXO
RXR
13MHz
fcomp
26.156942kHz
497
RF IF 27.095MHz 21.4MHz
RXN
1854
fcomp
26.156942kHz
Radiometrix Ltd
LMT0/LMR0 Data Sheet
page 7
Condensed specifications
Frequency
26.995, 27.045, 27.095, 27.145, 27.195, 27.255MHz (Standard)
Any 0.5MHz wide sub-band in 26-28MHz (General)
Frequency stability LMT0 ±1.0kHz
LMR0 ±0.5kHz
Channel spacing
10kHz
Number of channels
6 channels (standard)
16 channels controlled by parallel port or 32 via serial 4V level
UART interface
Operating temperature
Spurious radiations
-20 ºC to +70 ºC (Storage -30 ºC to +70 ºC)
Compliant with ETSI EN 300 220-2 and EN 301 489-3
Meets FCC Part 95
Transmitter
Output power
+10dBm (10mW) ±1dB nominal [factory fixed RF power variants]
+20dBm (100mW) ±1dB nominal
±1.2kHz
Peak deviation
TX on switching time
Modulation type
30ms from TXE transition
FSK (F3D)
TX modulation bandwidth
Adjacent channel TX power
TX spurious
DC – 4kHz (CMOS compatible)
<-37dBm
<-40dBm (<-54dBm in forbidden bands)
No RF output in Standby
Supply
Voltage
Current
4.1V – 15V
40mA for 10mW transmission
100mA for 100mW transmission
<5A standby (TXE high or floating)
Data (CMOS/TTL compatible)
33 x 23 x 9mm
Inputs
Size
Interface
User
RF
10 (8) pin 0.1" pitch dual row (5+5) header
2pin 0.1” pitch
Recommended PCB hole size
1.2mm
Receiver
Sensitivity
Image, Spurii
Blocking
LO re-radiation
Supply
-115dBm for 12dB SINAD
<-60db
Better than 90dB
-70dBm
Voltage
3.1V – 15V
Current
20mA receive
<1A standby (RXE low)
RSSI, audio, data (quasi DC data recovery circuit)
46 x 23 x 9 mm
Outputs
Size
Interface
User
RF
10 pin 0.1" pitch dual row (5+5) header
2pin 0.1” pitch
Recommended PCB hole size
1.2mm
Radiometrix Ltd
LMT0/LMR0 Data Sheet
page 8
RX Received Signal Strength Indicator (RSSI)
The LMR0 has wide range RSSI that measures the strength of an incoming signal over a range of 60dB or
more. This allows assessment of link quality and available margin and is useful when performing range tests.
The output on pin 5b of the module has a standing DC bias of up to 0.5V with no signal, rising to 2.2V at
maximum indication (RF input levels of -40dBm and above). Vmin-max is typically 2V and is largely
independent of standing bias variations. Output impedance is 40k. Pin 5b can drive a 100A meter directly,
for simple monitoring.
2.6
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40
RF level (dBm)
Figure 6: typical RSSI level with respect to received RF level at LMR0 antenna pin
Ordering Information:
Part No.
Description
Channel Frequencies (MHz)
RF power
(mW)
Channel
Spacing
(kHz)
Data
rate
kbps
LMR0-27-4
LMT0-27-4
Receiver
Transmitter
CH0: 26.995, CH1: 27.045MHz,
CH2: 27.095, CH3: 27.145MHz,
CH4: 27.195, CH5: 27.255MHz
10
10
4
4
10
LMT0-27-4-100mW Transmitter CH0: 26.995, CH1: 27.045MHz, 100
CH2: 27.095, CH3: 27.145MHz,
CH4: 27.195, CH5: 27.255MHz
Note: 25mW, 100mW version is intended for use in USA, Australia, NZ and only for model control in Europe
Radiometrix Ltd
LMT0/LMR0 Data Sheet
page 9
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
European Radiocommunications Office (ERO)
Peblingehus
Riverside House
Nansensgade 19
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
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
ero@ero.dk
www.ero.dk
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