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| Support brackets for the inverted vee antennas are mounted to the tower at approximately the 55 foot level. the brackets are fabricated from 1/4" x 6" x 12" aluminum plate which is mounted to the tower legs with 'U' bolts. The plates are also drilled to accept 1 1/4" 'U' bolts which serve as mounting hardware for the 1" x 4' square aluminum tubular stock used to stand-off the wire antennas approximately 3 feet away from the tower. Also you will notice the bracket on the 'right' supports the 30 meter center-fed vertical dipole antenna. |
30 Meter Vertical Dipole Feed Point
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| The 30 meter vertical dipole is center fed using a Balun as pictured above. The feed point impedance for the vertical dipole was measured at 23 ohms resistive and +J19. A 1/2 wavelength feed line of RG213 coax is used to feed this antenna. The impedance was actually measured at the input end of this feedline. A stub-match was designed to transform the feed point impedance to 50 ohms and installed at the input end of the feedline. The 30 meter vertical dipole is a great DX antenna. The tower has very little effect on the directional characteristics of the antenna radiation pattern. |
Bottom Support for the 30 Meter Vertical Dipole
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| The bottom support for the 30 meter vertical dipole is simply a 7' x 1 1/4" piece of schedule 40 PVC. The PVC was drilled to accept 'U' bolts and is mounted to the tower legs with 1 1/4" 'U' bolts, |
