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Thread: 1090Mhz atenna

  1. #21
    Captain abcd567's Avatar
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    Home-brew Antenna

    DSC02542B.GIF DSC02543B.GIF
    See attached Images for My Home-Brew System of Antenna, 2x 18 dB inLine Amplifiers, Home-brew DC 15V Power Injector (Bias-T). My Maximum Range = 450 Kilometers with indoor antenna (simple quarter-wave dipole - 2 arms, 6.8 cm each) + 2 in-line amplifiers in cascade as shown in these pictures.

  2. #22
    Captain abcd567's Avatar
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    Sep 2013
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    Toronto CYYZ
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    Home Brew Antenna -2

    My earlier home-brew antenna was really tiny & cute. It was 1/2 wavelength dipole consisting of two 1/4 wavelength arms, i.e a total of 2x6.8=13.6 cm, the tiniest antenna resonant at 1090 MHz. This antenna has a theoretical gain of 2 dBi.

    I have now built a "4-Element Franklin Co-Linear" dipole antenna with 5 dBi gain.
    It is a dipole, and has 2 arms, each arm is 2 x 1/2 wavelength tall.
    The total height of this dipole is therefore 2 x 2 x 1/2 wavelength = 2 x 2 x 1/2 x 27.2 cm = 54.4 cm.
    This antenna is 4 times taller than my tiny 1/2 wave dipole but has a gain of 5 dBi compared to 2 dBi of tiny dipole.

    In order to cover for attenuation of long coaxial cable, I have used 2 in-Line amplifiers (13-18 dB Gain each), costing $4 each amplifier.

    Please see attached pictures for my setup:
    Picture 1: DVB-T SDR USB Receiver connected to Desktop Computer.
    Picture 2: Power Injector (also called Bias-T) for injecting 15V DC in coaxial cable to power the in-Line Amplifiers.
    Picture 3: 4 x half-wave element Franklin Co-Linear Dipole Antenna.
    Picture 4: 1 x half-wave element basic Dipole Antenna.
    Picture 5: Schematic Diagram of the setup.


    DSC02555C.GIF DSC02543C.GIF DSC02576-R90c.jpg DSC02542C.GIF BIAS-T-02.jpg

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