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    2m HAM-radio dipole array system D4-2m

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    2m HAM-radio dipole array system D4-2m
    Electrical specifications
    Model D4-2m
    Operating frequency band, MHz 125-160
    VSWR, not more than 1,5
    Gain OMNI, dBi 8.15
    Gain OFFSET, dBi 11.15
    Sector (-3dB) in vertical plane 180
    Impedance, Ohm 50
    Max. power input, W 400
    Mechanical specifications
    Model D4-2m
    Weight, kg 10,4
    Height/Length, M 5
    Construction material Aluminium alloy
    Mast diametr, mm 38-65
    Rated wind velocity, m/s 45
    Wind loading area, m2 0,6
    Rated wind velocity with 0.5" icing, m/s 28
    Temperature range, °C from -50 to +50
    Connector N-female

    D1-2m, D2-2m, D4-2 are the series of legendary Pistolkors loop dipoles, designed specially for a two-meter amateur band of 144-146 MHz.
    If we look at match frequency characteristics of its predecessor for commercial communications in the range of 160 MHz, we can hardly call it "operable" for amateur frequencies. Radio amateurs are very demanding and pedantic persons. Therefore, in order to satisfy their needs, we had to change the size of the antenna and matching transformers. Thus, the first single dipole was created, and later the double, and quadruple antenna arrays.
    Due to new antennas with the duplexer DPRE4-6-2m we can now create the ideal repeaters.

    VSWR diagram D4-2m

    H-plane pattern, OMNI (1/2λ)

    H-plane pattern, OFFSET (1/4λ)

    H-plane pattern, OFFSET (1/8λ)

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