ENT1 Datasheet PDF - Radiometrix
|Description||12.5kHz Channel VHF High Power TX|
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Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Issue 1, 16 October 2007
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
12.5kHz Channel VHF High Power TX
The ENT1 transmitter modules offer a
100mW RF output VHF data link in
Radiometrix SIL standard pin-out and
footprint. This makes the ENT1 ideally
suited to those low power applications
where existing narrow band and
wideband transmitters provide
insufficient range. Together with the
matching LMR1/RX1M receiver a one-
way radio data link can be achieved
over a distance up to 10km+ with
suitable choice of data rate and
Figure 1: ENTI –169.40625-3
• Conforms to EN 300 220-3 and EN 301 489-3
• Standard frequency 169.406250MHz
• Other frequencies from 120MHz to 180MHz
• 12.5 kHz channel spacing
• Data rates up to 3kbps
• Usable range over 10km
• Fully screened
• Low power requirements
• Remote meter reading
• Data loggers
• Industrial telemetry and telecommand
• In-building environmental monitoring and control
• High-end security and fire alarms
• DGPS systems
• Vehicle data up/download
• Size: 43 x 14.5 x 5mm
• Operating frequency: 169.406250MHz
• Supply range: 5v
• Current consumption: 70mA Max
• Data bit rate: 3kbps max.
• Transmit power: 20dBm (100mW) nominal
ENT1 high power transmitter data sheet
Power supply requirements
The ENT1 has a built-in regulator which delivers a constant 3.3V to the transmitter frequency control
circuitry when the external supply voltage is 3.4V or greater. This ensures constant frequency stability
and removes the need for external supply decoupling except in cases where the supply rail is extremely
poor (ripple/noise content >0.1Vp-p).
TX modulation requirements
The module is factory-set to produce the specified FM deviation with a TXD input to pin 14 of 5V
amplitude, i.e. 0V “low”, 5V “high
If the data input level is greater than 5V, a resistor must be added in series with the TXD input to limit
the modulating input voltage to a maximum of 5V on pin 7. TXD input resistance is 100kΩ to ground.
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:
Note: The figure for 1.2kbps assumes that the receiver bandwidth has been suitably reduced by
utilising an outboard sallen-key active audio filter and data slicer or similar arrangement.
The ENT1’s TXD input is normally driven directly by logic levels but will also accept analogue drive
(e.g. 2-tone signalling). In this case it is recommended that TXD (pin 14) be DC-biased to 2.5V approx.
with the modulation ac-coupled and limited to a maximum of 5Vp-p to minimise distortion over the link.
Although the modulation bandwidth of the ENT1 extends down to DC it is not advisable to use data
containing a DC component. This is because frequency errors and drifts between the transmitter and
receiver occur in normal operation, resulting in DC offset errors on the receiver’s audio output.
ENT1 high power transmitter data sheet
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