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Teilenummer | HX1 |
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Beschreibung | VHF Narrow Band FM 300mW Transmitter | |
Hersteller | Radiometrix | |
Logo | ||
Gesamt 9 Seiten 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 pin-
out 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
The following types of integral antenna are in common use:
Quarter-wave whip. This consists simply of a piece of wire or rod connected to the module at one end.
At 169MHz the total length should be 421mm from module pin to antenna tip including any
interconnecting wire or tracking. Because of the length of this antenna it is almost always external to
the product casing.
Helical. This is a more compact but slightly less effective antenna formed from a coil of wire. It is very
efficient for its size, but because of its high Q it suffers badly from detuning caused by proximity to
nearby conductive objects and needs to be carefully trimmed for best performance in a given situation.
The size shown is about the maximum commonly used at 169MHz and appropriate scaling of length,
diameter and number of turns can make individual designs much smaller.
Loop. A loop of PCB track having an inside area as large as possible (minimum about 5cm2), tuned and
matched with 2 capacitors. Loops are relatively inefficient but have good immunity to proximity
detuning, so may be preferred in shorter range applications where high component packing density is
necessary.
Integral antenna summary:
Ultimate performance
Ease of design set-up
Size
Immunity to proximity effects
whip
***
***
*
**
helical
**
**
***
*
loop
*
*
**
***
421mm @ 169MHz
Whip antenna
wire, rod, PCB track
RF or a combination of these
length(mm) = 71250 / freq(MHz)
Helical antenna
35-40 turns wire spring
RF length 120mm, dia 10mm
trim wire length or expand coil
for best results
Ctune
Loop antenna
RF
C match
track width = 1mm
min. area 500mm 2
capacitors may be variable or fixed
(values depend on loop dimensions)
RF GND
Figure 4: integral antenna configurations
External antennas
These have several advantages if portability is not an issue, and are essential for long range links.
External antennas can be optimised for individual circumstances and may be mounted in relatively
good RF locations away from sources of interference, being connected to the equipment by coax feeder.
Helical. Of similar dimensions and performance to the integral type mentioned above, commercially-
available helical antennas normally have the coil element protected by a plastic moulding or sleeve and
incorporate a coax connector at one end (usually a straight or right-angle BNC type). These are compact
Radiometrix Ltd.,
HX1 high power transmitter data sheet
Page 6
6 Page | ||
Seiten | Gesamt 9 Seiten | |
PDF Download | [ HX1 Schematic.PDF ] |
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