12m Antenna

This antenna is removed and replaced with a 6 el yagi with 12m boom placed in the second tower.

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The 4 element 12 m yagi is made of a CueDee 4 el 15m Yagi. The elements are of course shortened but the boom is extended to 7m (23 ft). As the 12 m band is very narrow the antenna can be optimized for Gain and F/B. Mike SJ2W has made the final design.

Boom legth (diam 50 mm/ 2″) 7 m (23 ft)
Longest Element 6.22 m (20,33 ft)
Turning Radius
Weight
Forward Gain (free space) 7.23 dBd
F/B 24.1 dB

Antenna tested at 7m over ground.image

The gamma match is orginal CueDee just refurbished with new stainless steel screews.

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MMANA plots for antenna at 12m (39 ft)  without the gamma match.

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HFTA plots, could be higher for oceania but the other paths looks resonable.

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Final feeder 0.5 wave lenght of RG-213, Phase shift 179.97 degrees. Loss 0.03 dB

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