Document
NEW Radiometrix
28 August 2007
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
HX1 (300mW)
VHF Narrow Band FM 300mW Transmitter
The special HX1 transmitter modules offer a 300mW RF output VHF data link in Radiometrix SIL standard pinout and footprint. This makes the HX1 ideally suited to those low power applications where existing narrow band and wideband transmitters provide insufficient range. Together with the matching NRX1 or BiM1R receiver a one-way radio data link can be achieved over a distance up to 10km+ with suitable choice of data rate and antennas.
Figure 1: HX1-169.4125-3-5V
Features
• Standard frequency: 169MHz band • Other frequencies from 120MHz to 180MHz • Data rates up to 3kbps • Usable range over 10km • Fully screened • Low power requirements
The HX1 is a narrow band radio transmitter module for use in long range data transfer applications at ranges up to 10kilometres. HX1 transmitter circuit is the BiM1T transmitter circuit in the TX1 pin-out with slightly enlarged dimension to accommodate extra Power Amplifier circuit to produce 300mW RF output and available for operation on 169MHz European licence exempt frequency band.
Applications
• Tracing and asset tracking systems • Meter reading systems • Industrial telemetry and telecommand • Data loggers • In-building environmental monitoring and control • Social alarms • High-end security and fire alarms • Automatic Position Reporting System (APRS) • DGPS systems • Vehicle data up/download
Technical Summary
• Transmit power: 300mW (24.7dBm) • Operating frequency: 169.4125MHz, 169.5625MHz • Supply: 5V (regulated) • Current consumption: 140mA nominal transmit • Data bit rate: 3kbps max. • Size: 43 x 15 x 5mm
Radiometrix Ltd.,
HX1 high power transmitter data sheet
Page 1
Radiometrix Ltd.,
HX1 high power transmitter data sheet
Figure 2: HX1 block diagram
Page 2
Functional description
The HX1 transmitter consists of a frequency modulated Voltage Controlled Crystal Oscillator (VCXO) feeding a frequency doubler with two stage amplifier and RF filter. Final Power Amplifier stage is factory pre-set to appropriate band power level. Operation can be controlled by the EN (Enable) line, the transmitter achieving full RF output typically within 5ms of this line being pulled high. The RF output is filtered to ensure compliance with the appropriate radio regulations and fed to the 50Ω antenna pin.
User interface
14.5mm
43mm
HX1(300mW)
5mm
pin spacing: 2.54 mm
15.24 mm
123
4 5 67
7 holes of 0.7 mm dia. pin spacing 2.54 mm
Figure 3: HX1 pin-out and dimension
1 = RF gnd 2 = RF out 3 = RF gnd 4 = En 5 = Vcc 6 = 0V 7 = TXD
TX1H pin 1, 3 2
4 5 6 7
Name RFgnd RF out
EN VCC 0V TXD
Function RF Ground
50Ω RF output to the antenna Pull high to enable Transmitter 5V regulated DC power supply Ground DC coupled input for 5V CMOS logic. Rin = 100kΩ
Note: Pinout and footprint as TX1. (but PCB is longer)
Radiometrix Ltd.,
HX1 high power transmitter data sheet
Page 3
Absolute maximum ratings
Exceeding the values given below may cause permanent damage to the module.
Operating temperature Storage temperature
-10°C to +60°C -30°C to +70°C
Performance specifications:
(Vcc = 5V / temperature = 20°C unless stated)
Supply Supply voltage TX Supply current
pin min.
typ.
max. units
4- 5 - V 4 - 140mA - mA
notes
RF RF power output Spurious emissions Adjacent channel TX power Frequency accuracy FM deviation (peak) Antenna pin impedance RF centre frequency
Channel spacing Number of channels
2
+23.7
+24.7
+25.7
dBm
2 - -40 - dBm
- -37 - dBm
-2.5
0
+2.5
kHz
±2.5
±3.0
±3.5
kHz
2 - 50 - Ω
- 169.4125 -
MHz
- 169.5625 -
MHz
- 25 - kHz
-1-
1
2 3 4
5 5
Baseband
Modulation bandwidth @ -3dB
0
-
5 kHz
6
TXD input level (logic low)
6-
0
-V
7
TXD input level (logic high) 6 - 5.0 - V
7
Dynamic timing TX select to full RF
- 5 - ms
Notes:
1. Measured into 50Ω resistive load 2. For 1kbps Manchester encoded; the data bit rate is limited to 3kbps NRZ max. to meet adjacent
channel power specification. 3. Total over full supply and temperature range 4. With 0V – 5.0V modulation input 5. Other VHF 120-180MHz by special order 6. 5V CMOS compatible
7. To achieve specified FM deviation
Radiometrix Ltd.,
HX1 high power transmitter data sheet
Page 4
Applications information
Expected range
Predicting the range obtainable in any given situation is notoriously difficult since there are many factors involved. The main ones to consider are as follows: • Type and location of antennas in use • Type of terrain and degree of obstruction of the link path • Sources of interference affecting the receiver • “Dead” spots caused by signal reflections from nearby conductive objects • Data rate and degree of filtering employed
The following are typical examples – but range tests should always be performed before assuming that a particular range can be achieved in a given situation:
.