ANTENTOP- 01- 2013 # 017

All- Metal Three Element Antennas for the 145- MHz Band

Figure 5 SWR of the All- Metal Three Element Antenna

Figure 6 DD of the All- Metal Three Element Antenna

As you can see, MMANA shows different data compare to the stated by UA0SNM. However, the differences may be explained by the influences of the nearest subjects to the antenna. Coaxial cable of the proper length also could be transformed the antenna impedance to the 50- Ohm at transmitter side.

File MMANA for the All- Metal Three Element Antenna could be downloaded at: http://www.antentop.org/017/all_metal_017.htm

RW4HFN All- Metal Three Element Antennas for the 145- MHz Band

Igor Vakhreev, RW4HFN

Igor gives modified by him files MMANA with all- metal three element antennas for the 145- MHz Band.

One of the files contained a wide known Twin Delta Antenna. The antenna is not sensitive to nearest objects. Antenna elements maybe make from a length of a strand aluminum wire or a copper tube. Parameters of the Twin Delta Antenna are better compare to the antenna UA0SNM.

Figure 7 shows design of the antenna. The antenna may be made of a copper tube or stranded aluminum wire. Diameter of the tube or wire may be 6... 12- mm. Figure 8 shows impedance of the Three Element Twin Delta Antenna for the 145- MHz Band. Figure 9 shows SWR of the Three Element Twin Delta Antenna for the 145- MHz Band. Figure 10 shows DD of the Three Element Twin Delta Antenna for the 145- MHz Band.

File MMANA for the All- Metal Three Element Twin Delta Antenna could be downloaded at: http://www.antentop.org/017/all_metal_017.htm

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