T7G-434.525 QUASAR, T7G-434.525 Datasheet - Page 6

• Manufacturer Part Number: T7G-434.525
• Description: TRANSMITTER, NARROW BAND, 434.525
• Manufacturer: QUASAR

Specifications of T7G-434.525

• Svhc: No SVHC (18-Jun-2010)
• Current Rating: 25mA
• Data Rate Max: 20Kbps
• External Depth: 10mm
• External Length / Height: 3.5mm
• External Width: 31mm
• Frequency: 434.525MHz
• Operating Temperature Max: 70°C

Application Information
Antenna Design
The design and positioning of the antenna is as
crucial as the module performance itself in
achieving a good wireless system range.
following will assist the designer in maximising
system performance.
The antenna should be kept as far away from
sources of electrical interference as physically
possible.
decoupling capacitors should be placed close to
the module.
The antenna ‘hot end’ should be kept clear of any
objects, especially any metal as this can severely
restrict the efficiency of the antenna to receive
power. Any earth planes restricting the radiation
path to the antenna will also have the same effect.
Best range is achieved with either a straight piece
of wire, rod or PCB track @ ¼ wavelength
(15.5cm @ 433.92MHz). Further range may be
achieved if the ¼ wave antenna is placed
perpendicular in the middle of a solid earth plane
measuring at least 16cm radius. In this case, the
antenna should be connected to the module via
some 50 ohm characteristic impedance coax
DS307-7 Oct 05
RF
RF
Figure 4: Antenna Configurations To Be Used
With The FM Narrow Band Transmitter &
Helical Antenna
17 turns equally spaced
∅ = 5mm (inside)
Whip Antenna
If necessary, additional power line
Receiver Modules
34mm @ 433MHz
15.5cm @ 433MHz
FM 433MHz Narrow Band
©2004 REG No 277 4001, England.
The
Application Circuit
The application circuits show how the FM narrow
band transmitter and receiver modules can easily
be integrated into a system to form a wireless link.
Figure 5: FM Narrow Band Transmitter &
1
2
3
4
5
6
7
8
9
A0
A1
A2
A3
A4
A5
A6
A7
VSS
HT12D
1
2
3
4
5
6
7
8
9
A0
A1
A2
A3
A4
A5
A6
A7
VSS
OSC1
OSC2
VDD
D11
D10
DIN
Receiver Application Circuits
D9
D8
HT12E
VT
17
15
18
16
14
13
12
11
10
DOUT
OSC1
OSC2
AD11
AD10
+5V
VDD
AD9
AD8
TE\
DATA OUT 4
DATA OUT 3
DATA OUT 2
DATA OUT 1
R
18
17
16
15
14
13
12
11
10
OSC
+5V
1K5Ω
R
Page 6
OSC
ANTENNA
ANTENNA
T7G / R7G
R7 / GR7
1 2
T7 / R7
T7 / GT7
1
2
3 4 5 6 7
3
4
+5V
5
+5V