Download A barrelledness criterion for C 0(E) by Mendoza J. PDF

By Mendoza J.

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Extra resources for A barrelledness criterion for C 0(E)

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This is out of the range of most amateur impedance bridges. You could use a more professional bridge, such as a General Radio 916 or 1606A, but again the impedance is outside of the normal range and some range-extending tricks have to be used. I tried using a dip meter, with very poor results. The frequency calibration is very poor in most dip meters and there is considerable frequency pulling at resonance. Even using a frequency counter to track the dip meter was not totally satisfactory because of the effect of the meter itself and the fact that hand capacitance altered the resonant frequency.

5 dB. There are no surprises here—the taller the array, the more gain and F/B you can obtain. However, even at λ/4 (≈ 130 feet), there is usable gain and F/B, even though this is half the length (λ/2) of normal Yagi elements. Notice also from Fig 2 that I set the separation distance between the top ends at 6 feet. This is not a magic number, but the distance between the ends of the elements does affect the behavior. Spacings of order of 1 to 3 feet each side away from the support structure seem to work fine, although others should work also.

I hasten to say that this is speculation on my part. Fig 5—Vertical, horizontal and total pattern at 22° elevation for a single half-wave sloper with the upper end at 150 feet. Fig 6—Vertical, horizontal and total pattern at 22° elevation for two half-wave slopers. At A, driven in-phase and at B, 180° out of phase, with the upper ends at 150 feet. Jan/Feb 2004 35 Fig 7—Vertical, horizontal and total pattern at 22°° elevation for a four-element K1WA array, one driven element and three reflectors.

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