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    435.500MHz kinds of antenna DIY report

     

    Report 435.500MHz 435.500MHz various kinds of antenna antenna DIY DIY report recently swept recruited to Shenzhen ham station network 439.460/434.460, recalling the scene 20 years ago to participate in CRSA, inevitably some blood.
    On weekends, to find some of the material at hand, made several sub U-section antenna.

    Calculation:
    Considering U section equipment, the frequency range from 400 ~ 470MHz, usually will use to FRS 409MHz channels and Ham 430MHz
    435.500 taken as the center frequency.
    Wavelength = 300/435.500 = 68.88cm
    Transmission coefficient of material: 0.96
    Design antenna length 1/4 wavelength: 16.53cm

    Antenna 1:
    Vertical polarization 1/4 wavelength (Veranda) Figure 1
    Take electric cars spokes, cut into 16.5cm length, two in the middle with a ballpoint pen refills socket. Signals, respectively, then the feeder terminal and ground nets.
        
    Found: Quan Sheng, Donkey Kong, 0.5W, upper trunk, the Friends of Taiwan reported 59.
                
    439.600MHz, closing Ronggui, Zhongshan HAVES calls, signal 59


    Antenna 2:
    Vehicle 1/4 wavelength in Figure 2
    Market purchases 460MHz car antenna, remove the original antenna (does not match), the electric car nut put spokes, cut into 16.5cm length sleeve top with a ballpoint pen refills, sealing adhesive. The roof metal skin as reflex net.
      
    Found: Quan Sheng, Donkey Kong, 5W, FRS 14 Channels, 23:00 pavement exercise test, bonded --- Lotus School west CaiTian Road, Free Trade Zone ---- Qiaocheng, direct video call effective range


    Antenna 3:
    Hand sets 1/4 wavelength
    Quansheng Vajrapani Taiwan, demolition original helical antenna, in the middle of the core side, two soldered directly to a rod antenna, the length is adjusted to 16.4cm
       
    Found: 0.5W, Friday night, emergency station network after the event ends, the relay test, the Friends of Taiwan at 59


    Antenna 4:
    Vehicle 1/4 wavelength, vertical symmetry
    Do have a USB camera snake tube top camera demolished.
    Take an electric car spokes, cut into 16.5cm, some put ink refill, welding wire feeder in the middle of the feeder refill package ground network directly outside.
    Feeder tube from the piercing serpent, took over the station, the refill tube directly inserted into the upper end of the snake holes, just!
        
    Found: Quan Sheng, Donkey Kong, 5W, Tian Road, on the trunk, the exercise, the Friends of Taiwan at 59

    After no more than an antenna SWR meter to measure directly tested.

    Commercially available antenna base: $ 8,
    Spokes: 0.5 yuan per
    Other: Certain materials, manpower certain

     

     

     

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