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ENT1 の電気的特性と機能

ENT1のメーカーはRadiometrixです、この部品の機能は「12.5kHz Channel VHF High Power TX」です。


製品の詳細 ( Datasheet PDF )

部品番号 ENT1
部品説明 12.5kHz Channel VHF High Power TX
メーカ Radiometrix
ロゴ Radiometrix ロゴ 




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ENT1 Datasheet, ENT1 PDF,ピン配置, 機能
NEW Radiometrix
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
ENT1
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
antennas.
Figure 1: ENTI –169.40625-3
Features
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
Applications
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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
Technical Summary
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
Radiometrix Ltd.,
ENT1 high power transmitter data sheet
Page 1

1 Page





ENT1 pdf, ピン配列
Functional description
The ENT1 transmitter consists of a frequency modulated Voltage Controlled Temperature Controlled
Crystal Oscillator (VCTCXO) feeding a frequency multiplier 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 7ms of this
line being pulled high. The RF output is filtered to ensure compliance with the appropriate radio
regulations and fed to the 50antenna pin.
User interface
14.5mm
43mm
ENT1
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
1 = RF gnd
2 = RF out
3 = RF gnd
4 = En
5 = Vcc
6 = 0V
7 = TXD
Figure 3: ENT1 pin-out and dimension
ENT1 pin
1, 3
2
4
5
6
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Name
RFgnd
RF out
EN
VCC
0V
TXD
Function
RF Ground
50 RF input from the antenna
Pull high to enable Transmitter (Note 1)
5V DC power supply
Ground
DC coupled input for 5V CMOS logic. Rin = 100k
NOTES:
1. EN pin should not be left floating
Radiometrix Ltd.,
ENT1 high power transmitter data sheet
Page 3


3Pages


ENT1 電子部品, 半導体
Antennas
The choice and positioning of transmitter and receiver antennas is of the utmost importance and is the
single most significant factor in determining system range. The following notes are intended to assist
the user in choosing the most effective antenna type for any given application.
Integral antennas
These are relatively inefficient compared to the larger externally-mounted types and hence tend to be
effective only over limited ranges. They do however result in physically compact equipment and for this
reason are often preferred for portable applications. Particular care is required with this type of
antenna to achieve optimum results and the following should be taken into account:
1. Nearby conducting objects such as a PCB or battery can cause detuning or screening of the antenna
which severely reduces efficiency. Ideally the antenna should stick out from the top of the product
and be entirely in the clear, however this is often not desirable for practical/ergonomic reasons and
a compromise may need to be reached. If an internal antenna must be used try to keep it away from
other metal components and pay particular attention to the “hot” end (i.e. the far end) as this is
generally the most susceptible to detuning. The space around the antenna is as important as the
antenna itself.
2. Microprocessors and microcontrollers tend to radiate significant amounts of radio frequency hash
which can cause desensitisation of the receiver if its antenna is in close proximity. The problem
becomes worse as logic speeds increase, because fast logic edges generate harmonics across the VHF
range which are then radiated effectively by the PCB tracking. In extreme cases system range may
be reduced by a factor of 5 or more. To minimise any adverse effects situate antenna and module as
far as possible from any such circuitry and keep PCB track lengths to the minimum possible. A
ground plane can be highly effective in cutting radiated interference and its use is strongly
recommended.
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.
www.DaHtaSehlieceat4lU..cTohmis 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 151MHz 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
*
*
**
***
Radiometrix Ltd.,
ENT1 high power transmitter data sheet
Page 6

6 Page



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