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Tuesday, 31 December 2013

SIMPLE FM TRANSMITTER RANGE – UPTO 3 KM



FM TRANSMITTER RANGE – UPTO 3 KM
             This F.M Transmitter has 3 RF stages. A variable frequency V.H.F. Oscillator, a class C.R.F. driver and a class CRF amplifier with harmonics filter. Block diagram of transmitter is shown below .

             Power supply is 9 to 12 volts dc. RF output power is 150 mill watts. With telescopic antenna (75 C.M) range is up to 1 K.M . Range can be extended upto 3 KM, BY USING multi element yagi antenna having dipole, reflector, director elements.

               Frequency of transmitter can be set within 88-108 MHz F.M band by adjusting the first trimmer. Adjust output trimmer for maximum range of transmission.

              To power  this transmitter user 12 Volts battery. Do not user mains derive supply.
               Suggested Yagi antinna design using aluminium rods is shown here. Use 75 ohm Co-axial cable between transmitter and antenna. Inner wite of cable is connected to output of transitter and braid is connected to ground of P.C.B.
YAGI ANTENNA




Do not switch on transmitter without connecting proper antenna.
PARTS LIST
RESISTOR                             SEMICONDUCTORS
R1           -10K                       Q1          -BC548
R2           -15K                       Q2 -Q3  -C2026 / C2570
R3-R4    -4K7                       TRI – 1,2,3 – 22PF
R5           -68E                       MIC        - 2 PIN Cond. Mike
R 6          -2K2                       L1            - 7 TURN 22 SWG
R7           -22E                       L2            - 6 TURN 22 SWG
R8-         -1K                         L3            -5 TURN 22 SWG
R9           -10E                       L4            - 5 TURN 22 SWG

Data sheet of c 2024


 Data sheet of c 2570



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