The R.F. Solutions 458MHz FM Transmitter and receivers are compact ‘credit card’ sized crystal controlled
modules, capable of transmitting data up to 20 kilometres in direct line of sight, up to 1-3km within
buildings.
These modules are crystal controlled for frequency accuracy and are supplied tuned to one of 15 available
channel frequencies.
The units are suitable for general purpose telemetry applications where small size and high data rates are
needed. The module can transmit digital or analogue (GMSK, or FSK) data at up to 9600baud rate.
Supplied as a completed module, no modification or pre tuning is necessary. Connections are by gold
plated pins on the module base, enabling the module to be socketed for interchangeability (e.g. for other
frequency channels).
The radios have been designed to meet ETSI300-220, EN50081-1, EN50082-1 EMC directive and are DTI
approved under MPT1329 for licence free use.
TYPICAL OPERATION
Host Data
Source
TX6000
RX6000
Host Data
Source
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TX/RX6000
Frequency of Operation
The TX/RX6000 modules operate on the 458.500MHz to 458.950MHz telemetry band. There are 15
channels within this band. The TX/RX6000 modules are supplied at one of these specific channel
frequency bands. When ordering the modules, the exact frequency must be stated.
Ch No (Hex) Frequency (MHz)
02
458.525
04
458.550
06
458.575
08
458.600
0A
458.625
0C
458.650
0E
458.675
10
458.700
12
458.725
14
458.750
16
458.775
18
458.800
1C
458.850
1E
458.875
20
458.900
22
458.925
Radio Propagation
With any radio system, there are a number of factors affecting the system performance. These are
•
Transmitter power output
•
Height of transmitter and receiver antenna
•
Length of feeder cables to the antenna
•
Type and efficiency of antenna
•
Surrounding topography
•
The weather
Antennas
The types of antenna we recommend for this Modem are;
Helical
: The smallest, most compact antenna, has a gain of <1, designed for short ranges up to 2km
1/4 Wave Flexi
: General purpose antenna with gain <1 gives slightly better range than Helical
Yagi
: A highly directional antenna (Looks similar to a standard TV aerial). Typically has a gain of +3dB.
The output power of a transmitter connected to a Yagi must be reduced in order to comply to the DTI
specifications. This does however have the advantage of reducing the power consumed by the transmitter
to achieve the same range. By connecting a Yagi to a receiver, the system range may be extended to
20km.
Note
: Try to keep the feed wire to the antenna as short as possible, If the antenna is to be mounted some
distance away low loss 50Ω co-axial cable should be used as the interconnection.
Power Supply
It is not advisable to use a switched mode power supply, either to drive the TX6000/RX600 module or
within close proximity to it. Switched mode power supplies can produce high energy radio frequencies over
a broad spectrum potentially causing interference with the operation of the Modem.
DS006-2
Oct 02
2003
REG No 277 4001, ENGLAND.
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Transmitter Connections : Pins on underside of Module
Pin
1
2
3
4
5
6
7
8
9
10
11
12
Description
Ground
Modulation Input 500mVpk-pk +ve freq deviation
Modulation Input 500mVpk-pk -ve freq deviation
Digital Data input (TTL)
Switched +5V (supply to Rx when used as transceiver)
Test
Regulated +5V
Transmitter ON
(Connect to Common to start the Transmitter)
Supply Voltage to Module (7.2 - 9V)
Receiver RF Output (for use in transceiver)
Ground
Antenna
TX/RX6000
Direction
Input
Input
Input
Input
Output
Output
Output
Input
Input
Output
Input
Output
Receiver Connections : Pins on underside of Module
Pin
1
2
3
4
5
6
7
11
12
Description
Ground
Receiver Signal Strength Indicator (RSSI) 0-2V Log Range
Demodulated Output
Test (unfiltered modulated output)
+5V supply to Local Oscillator and RF Amplifier
Digital Data Ouptut
+5V supply to IF and LF Amplifiers
Ground
Antenna
Direction
Input
Output
Output
Output
Input
Output
Input
Input
Antenna
Power Save Mode
The receiver may be put into power save mode by removing the 5V supply to pin 5. The RSSI will still
indicate a valid signal. After re-applying power to pin5 the data output will be valid within <5msecs.
50.8
12.5mm
12
11
10
4.0
15.0
Top View
(pins on underside)
2.5
2
NOTES
Pins on a 2.54mm pitch
Pins are 2.6 x DIA0.51mm in Gold Plate
Pins 8, 9, 10, 11 are on the transmitter only
9
8
7
6
5
4
3
2
1
25.4
36
2.8
4.0
All Dimensions in mm
Mechanical Details
DS006-2
Oct 02
2003
REG No 277 4001, ENGLAND.
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Circuit Connections
TX/RX6000
12
11
10
12
0V
1K
Ω
+7V
TX on
Digital Data In
0V
9
8
7
6
5
4
3
2
1
+5V
Digital Data Out
7
6
5
4
3
2
1
RSSI
0V
Transmitter Connections
Transceiver Application Connections
Receiver Connections
12
11
10
N o te
This link to be exactly
100mm of Coaxial Cable
9
8
7
6
5
4
3
2
1
+7V Supply Voltage
Transmitter On
Digital Data In
Transmitter Connections
Digital Data Out
RSSI
0V
12
9
8
7
6
5
4
3
2
1
Receiver Connections
W hen a transceiver is configured, the
receiver module is placed into power
save mode automatically when the
transmitter is powered on.
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2003
REG No 277 4001, ENGLAND.
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ABSOLUTE MAXIMUM RATINGS
Storage Temperature..........................................................-30 to +85
o
Celsius.
Operating Temperature....................................................... -25 to +55
o
Celsius.
TX/RX6000
DIMENSIONS
Length = 36,
Width = 51,
Height = 12.5mm
Weight = 30grams
TECHNICAL SPECIFICATION
Ambient temperature
= 25 Celsius.
o
ELECTRICAL CHARACTERISTICS
Transmission Frequency
Channels
Modulation
TRANSMITTER
Supply Voltage
Supply Current
Radiated Power
Start up Time
Data Input (Logic Low)
Data Input (Logic High)
RECEIVER
Supply Voltage
Supply Current
Power Save Supply Current
Sensitivity
Modulation Output
Data Ouput (Logic Low)
Data Ouput (Logic High)
MIN
TYPICAL
458.850
1
MAX
DIMENSION
MHz
NOTE
See Note 2
7
150
170
0
3.5
4.7
0.2
3.8
5
15
500
9
200
500
5
0.8
5
5.3
V
mA
mW
mSecs
V
V
V
mA
µA
dBm
Vpk-pk
V
V
Transmitting
TTL
TTL
-122
0
3.5
0.2
3.8
5
0.8
5
TTL
TTL
Notes:
1. There are 15 channels in 5MHz sub-bands. The module is supplied at one fixed frequency.
2. Modulation used is F3D
PART No
TX6000-XXX
RX6000-XXX
DESCRIPTION
Transmitter 458MHz XXX = Frequency Channel
Receiver 458MHz XXX = Frequency Channel
For more information or general enquiries, please call;
R. F. Solutions Ltd.,
Unit 3, Cliffe Industrial Estate,
South Street,
Lewes,
E Sussex, BN8 6JL. England.
Tel +44 (0)1273 898 000. Fax +44 (0)1273 480 661.
Email sales@rfsolutions.co.uk
Web Page http://www.rfsolutions.co.uk
RF Solutions is a member of the Low Power Radio Association.
Data appears courtesy of Warwick Industrial Electronics Ltd
Information contained in this document is believed to be accurate , however no representation or warranty is given and no liability is assumed by R.F. Solutions Ltd. with respect to the accuracy of
such information. Use of R.F.Solutions as critical components in life support systems is not authorised except with express written approval from R.F.Solutions Ltd.
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