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| 型號(hào)： | QFMT5-433 |
| 英文描述： | FM TRANSMITTER MODULE 433 |
| 中文描述： | 調(diào)頻發(fā)射模塊433 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 298K |
| 代理商： | QFMT5-433 |
FM Radio Transmitter & Receiver Modules
T5 / R5
DS305_1 Oct 00
ó
2000 REG No 277 4001, England.
Page 5
Antenna Design
The design and positioning of the antenna is as
crucial as the module performance itself in
achieving a good wireless system range. The
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. If necessary, additional power line
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 @ wavelength
(15.5cm @ 433.92MHz). Further range may be
achieved if the 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
Figure 3: Antenna Configurations To Be Used
With The QFMT5 & QFMR5 Modules
Application Circuit
The application circuits show how the QFMT5
transmitter and the QFMR5 receiver can easily be
integrated into a system to form a wireless link.
T5
A0
A1
A2
A3
A4
A5
A6
A7
VSS
AD8
AD9
AD10
AD11
TE\
OSC2
OSC1
DOUT
VDD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
HT12E
R
OSC
+5V
4
5
1
2
3
+5V
ANTENNA
Figure 4: QFMT5 Transmitter Application
Circuit
Figure 5: QFMR5 Receiver Application Circuit
RSSI Values:
The QFMR5 RSSI output provides a DC output
proportional to the RF input signal. The table
below shows the typical RSSI value depending on
the Rf signal strength.
RF Signal Strength / dBm
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
RSSI / V
tba
RF
RF
Helical Antenna
Whip Antenna
34mm @ 433MHz
17 turns equally spaced
= 5mm (inside)
15.5cm @ 433MHz
A0
A1
A2
A3
A4
A5
A6
A7
VSS
D8
D9
D10
D11
DIN
OSC2
OSC1
VT
VDD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
18
HT12D
+5V
15
R
OSC
DATA OUT 1
DATA OUT 2
DATA OUT 3
DATA OUT 4
17
1K5
W
Quasar
R 5
1 2
3 4 5 6 7
+5V
ANTENNA
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相關(guān)代理商/技術(shù)參數(shù) |
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| QFMT5-434 | 制造商:RFSOLUTIONS 制造商全稱:rfsolutions.ltd 功能描述:FM Radio Transmitter & Receiver Modules |
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| QFMT5-434-3V | 制造商:RFSOLUTIONS 制造商全稱:rfsolutions.ltd 功能描述:FM Radio Transmitter & Receiver Modules |
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