●
WHAT IS IT?
UHFM
It is a device used for transmitting and receiving data at ultra high frequencies in the range
between 300 megahertz (MHz) and 3 gigahertz (Ghz)
we are using UHF module because of its high data transfer rates (Maximum data rate is 4800
bps) and we can Gain real-time visibility of aircraft on GCS software
●
WORKING
modulation transmission receiver demodulation
MODULATION
●
Modulation, in electronics, technique for impressing information (voice, music, pictures, or data) on a radio-frequency carrier wave by varying one or more characteristics of the
wave in accordance with the information signal.
●
Transmitter:
Signal Generation: The transmitter within the UHF module generates radio frequency
(RF) signals at specific UHF frequencies.
ANT PIN TO CONNECT TO ANTENNA
VCC PIN HAS WIDE RANGE OF INPUT VOLTAGE FROM 3V TO 12V
TRANSMITTER CAN CONSUME MIN CURRENT OF 9mA TO MAX OF 40 mA
DATA
DATA PIN TO TRANSMIT THE
SIGNAL
HT12E IC
ENCODER IC THAT CONVERTS 4 BIT
PARALLELDATA FROM 4 DATA PINS INTO SERIAL GND
DATA IN ORDER TO TRANSMIT OVER RF LINK GROUND
USING TRANSMITTER
433mHz CRYSTAL OSSILATOR
VOLTAGE REGULATOR A CRYSTAL OSCILLATOR IS AN ELECTRONIC
MAINTAINS A CONSTANT VOLTAGE OSCILLATOR CIRCUIT THAT USES PIEZOELECTRIC TRANSMITTER
OF 5 V CRYSTAL AS FREQUENCY-SELECTIVE ELEMENT CIRCUIT
●
Receiver: Signal Reception: The receiver component of the UHF module detects RF signals transmitted from other devices or antennas
within its range
ANT ANTENNA PIN FOR
RECEIVING SIGNALS
GND GROUND
DIN
DATA INPUT PIN TO GET THE
RECEIVED DATA
VCC
POWERED WITH REGULATED 5V
OPERATING CURRENT IS <5.5 mA
HT12D IC
DECODER IC THAT CONVERTS THE SERIAL
DATA RECEIVED BY THE RF RECEIVER INTO
4-BIT PARALLEL DATA AND DRIVES THE
OUTPUT ACCORDINGLY
433mHz CRYSTAL
OSSILATOR
DATA
PIN IS USED TO GET THE DEMODULATED DATA AND SENT OUT
THE RECEIVED SIGNAL IS THEN DEMODULATED
TO GET THE DATA
RECEIVER CIRCUIT MIXING 433MHZ WITH RECEIVED SIGNAL
ALLOWING U TO DEMODULATE THE DATA
RESONANT COMAPARTOR FOR
CLEARING THE SIGNAL
CIRCUIT
AMPLIFICATION
OF WEAK
SIGNAL
DEMODULATED DATA BOOSTING THE SIGNAL
USING INVERTING
AMPLIFIER
