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
TX1M/RX1M
The TX1M transmitter and RX1M receiver
modules offer a low power, reliable data link in
an industry-standard pin out and footprint. This
makes the TX1M/RX1M pair ideally suited to
those low power applications where existing
wideband modules have insufficient range, or
where multi-channel operation is needed in
VHF frequency.
Issue 3, 02 August 2012
VHF Narrow Band FM multi channel TX and RX
Features
Conforms to EN 300 220-3 and EN 301 489-3
Any custom band in 60 - 65MHz with 1MHz or 135 - 175MHz with 3MHz (AR0) frequency
range
Data rates up to 5 kbps for standard module
Usable range over 1km (@100mW)
Fully screened. Low profile
Feature-rich interface (RSSI, automatic noise squelch, analogue and digital baseband)
Incorporate a 1200baud dumb modem
Re-programmable via RS232 interface
Low power requirements
TX1M-151-5
RX1M-151-5
Applications
Handheld terminals
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 7mm
Operating frequency: 60-65MHz or 135 – 175MHz
128 serial select or 8 parallel select channels
Transmit power: +20dBm (100mW) nominal
Supply range: 4.5V - 15V
Current consumption: 110mA transmit, 13mA receive
Data bit rate: 5kbps max. (standard module)
Receiver sensitivity: -118dBm
(
for 12 dB SINAD)
Receiver blocking -85dB
Evaluation platforms:
NBEK + XX2M carrier
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 1
Radiometrix Ltd
TX1M/RX1M Data Sheet
Figure 1: TX1M block diagram
page 2
Radiometrix Ltd
TX1M/RX1M Data Sheet
Figure 2: RX1M block diagram
page 3
Pin Description – TX1M
Figure 3: TX1M Footprint (Top) view
Pin
1A
2A
1B
2B
3B
1C
2C
3C
4C
5C
6C
7C
8C
9C
10C
Name
Vcc
Gnd
Gnd
RF out
Gnd
0V
TXE
TXD
AF in
+4.4Vout
PGM
0V
P1 (MOD TXD)
P2 (MOD NC)
P3 (MOD TXH)
Function
4.5 – 15V
Ground
RF ground
To the antenna
RF ground
Ground
Transmitter enable. Low = ON, open = off. 4k7 internal pullup to Vcc
DC coupled input for 3-12V CMOS logic. Leave open if unused
AC coupled Analogue Input. Limit to 1V
pk-pk
±10%
to keep distortion <1.5%
and peak FM deviation >2.5kHz (>2kHz for 60-65MHz)
DC supply. 75mA maximum drain. Only present when TXE is low
Serial programming/configuration input at RS232 level
Ground
Parallel frequency select inputs. Inverted logic, 10k pullups to 4V
Notes:
1. Internal AF Input gain is factory set for 1V
pk-pk
to produce 3kHz peak deviation and minimum
distortion. Analogue gain may be set for an input level of 50mV – 2V
pk-pk
. This cannot be done
without appropriate test equipment. Contact factory for details
2. With 1200baud modem mode enabled, parallel selection of channel is unavailable as the P1-P3
lines are used for input/output operations.
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 4
3. Pin Description – RX1M
Figure 4: RX1M Footprint (Top) view
Pin
1A
2A
1B
2B
3B
1C
2C
3C
4C
5C
6C
7C
8C
9C
10C
Name
Vcc
Gnd
Gnd
RF out
Gnd
RSSI
SQF
AF out
RXD
+4.4V out
0V
PGM
P1 (MOD NC)
P2 (MOD RXD)
P3 (MOD CDE)
Function
4.5-15V
Ground
RF ground
To the antenna
RF ground
DC level between 0.5V and 2.5V. 60dB dynamic range
Noise operated carrier detect. Open collector. ON/low = no signal
200mV
pk-pk
audio. DC coupled, approx 1V bias. Muted by squelch
Open collector output of data slicer. Need external pull-up
DC supply. 75mA maximum drain. Present if unit is powered.
Ground
Serial programming/configuration input at RS232 level
Parallel frequency select inputs. Inverted logic, 10K pullups to 4V
Notes:
1. Carrier detect on RX1M mutes the AF and RXD outputs when RF input signal is <-123dBm. This can
be factory disabled if required.
2. There are no pullups on the open collector outputs. External pull-up resistor should be used.
3. With 1200baud modem mode enabled, parallel selection of channel is unavailable as the P1-P3
lines are used for input/output operations.
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 5
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