|
|
Teilenummer | R5-434-5-50B |
|
Beschreibung | FM Radio Transmitter & Receiver Modules | |
Hersteller | rfsolutions | |
Logo | ||
Gesamt 8 Seiten FM Radio Transmitter & Receiver Modules
T5 / R5
Features
• Miniature SIL package
• Fully shielded
• Data rates up to 128kbits/sec
• Range up to 300 metres
• Single supply voltage
• Industry pin compatible
T5-434
• Temp range -20°C to +55°C
• No adjustable components
• High shock resistance
• Temperature compensated RF output
Applications
• Vehicle alarm systems
• Remote gate controls
• Garage door openers
• Domestic and commercial security
General Description
The T5 and R5 data link modules are miniature
UHF radio modules, which enable the
implementation of a simple telemetry link upto 300
metres, and at data rates of up to 128Kbit/s
The T5 and R5 modules will suit one-to-one and
multi-node wireless links in applications including
building and car security, remote industrial
process monitoring and computer networking.
The ‘B’ derivative parts offer a cost reduced
version.
R5-434
• High sensitivity
• Analogue / Digital Outputs
• Signal strength output (RSSI)
• On board AGC
• Single conversion FM Super-Het
• Double RF filtering (inc saw front end)
The receiver is based on the classical superhet
single conversion architecture utilising a PLL xtal
referenced oscillator which yields a highly stable
IF frequency (10.7 MHz). This hence allows use of
high Q bandpass filters offering excellent adjacent
channel rejection and hence high interference
Immunity.
Because of its small size and low power
requirements, these modules are ideal for use in
portable battery powered wireless applications.
DS305-7 Feb ‘04
©2004 REG No 277 4001, England.
Page 1
FM Radio Transmitter & Receiver Modules
T5 / R5
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 @ 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
Helical Antenna
RF
34mm @ 433MHz
17 turns equally spaced
∅ = 5mm (inside)
Whip Antenna
RF
15.5cm @ 433MHz
RSSI Values:
The R5 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. The circuit diagram shows
how a carrier detect can be obtained from the
RSSI pin on the receiver module.
RF Signal Strength / dBm RSSI / V
RF Signal Strength / dBm
-120
-110
-100
-90
-80
-70
-60
-50
-40
RSSI / V
1.27
1.33
1.49
1.74
1.99
2.3
2.56
2.63
2.63
Carrier Detect circuit
The R5 RSSI output provides a DC output
proportional to the RF input signal. In order to
generate a Carrier Detect (as a logic level) The
following circuit may be used.
5V
10 K ohm
RSSI OUT
PIN 3
39 K ohm
62 K ohm
GND
CD
Figure 3: Antenna Configurations To Be Used
With The T5 & R5 Modules
DS305-7 Feb ‘04
©2004 REG No 277 4001, England.
Page 6
6 Page | ||
Seiten | Gesamt 8 Seiten | |
PDF Download | [ R5-434-5-50B Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
R5-434-5-50 | FM Radio Transmitter & Receiver Modules | rfsolutions |
R5-434-5-50B | FM Radio Transmitter & Receiver Modules | rfsolutions |
Teilenummer | Beschreibung | Hersteller |
CD40175BC | Hex D-Type Flip-Flop / Quad D-Type Flip-Flop. |
Fairchild Semiconductor |
KTD1146 | EPITAXIAL PLANAR NPN TRANSISTOR. |
KEC |
www.Datenblatt-PDF.com | 2020 | Kontakt | Suche |