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Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an

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Broadband Vertical for 430- MHz Band

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ANTENTOP- 01- 2015, # 019

Broadband Vertical for 430- MHz Band

 

The publication is devoted to the memory UR0GT.

Credit Line: Forum from:

www.cqham.ru

By: Nikolay Kudryavchenko, UR0GT

 

 

Broadband Vertical Collinear Vertical antenna designed for 430- MHz Band. The antenna has Diagram Directivity with low-altitude maxima to the ground. Antenna has passband near 70- MHz at SWR 1.5:1.0. Figure 1 shows design of the Broadband Vertical for 430- MHz Band.

Antenna made from aluminum or copper rod in 3- mm diameter. Capacitor 0.22- pF may be made structurally. Just thin dielectric- mika or Teflon between the two vertical vibrators. Antenna should be places at conductivity surface or have several counterpoises. The antenna has 200- Ohm input impedance. Such input impedance may be easy matched at one Band but there are some difficulties to match such impedance in wide band by simple methods.

 

Figure 2 shows input impedance of the antenna at 430- MHz Band. Figure 3 shows SWR of the antenna at 430- MHz Band. Figure 4 shows DD of the antenna at 430- MHz Band.

 

Figure 5 shows input impedance of the antenna at 100- MHz pass band at 433- MHz central frequency. Figure 6 shows SWR of the antenna at 100- MHz pass band at 433- MHz central frequency. Figure 7 shows DD of the antenna at 100- MHz pass band at 433- MHz central frequency.

  73! de UR0GT

The MMANA model of the Broadband Vertical for 430- MHz Band may be loaded: http: //

www.antentop.org/019/broadband_ur0gt_019.htm

 

 

Figure 1 Design of the Broadband Vertical for 430- MHz Band

 

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