Thursday, December 5, 2019
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DUAL DDRR C0-Phased Citizens Band HF Antenna Array

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In layman’s terms a DDRR is just a short vertical monopole (vertical post) attached to a transmission line tuned by a reactance (ring plus vacuum capacitor). The reactance of the capacitor is transformed by the transmission line and will under specific conditions (length, value of the capacitor, etc.) make the vertical post resonant. Slight variations of the capacitor will lengthen or make the transmission line “shorter” and allow tuning of the antenna on a certain range.

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Mountain Radio Challenge 

What is the Mountain Radio Challenge Melbourne

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The idea was to see what distance could be achieved, on 27MHz using ground wave. It was common to talk interstate or overseas when the skip was running, but to get decent distance without skip was a challenge.

Originating from CBers in the North Eastern Suburbs of Melbourne we would found mountains to camp on for the weekend and see what distances we could achieve.

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