7-band OCF dipole

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Revision as of 15:57, 25 October 2020 by Firespeaker (talk | contribs) (After raising rope on long end another ~5ft, 2020-10-06)
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80m 7-band off-center-fed dipole bought from gniklat1 on eBay.

Advertised to work on 80m, 40m, 20m, 17m, 12m, 10m, and 6m (tuner needed to cover all of 80m and 10m), with max power 300W PEP, 150W CW, 75W Digital. Advertised to work best in an inverted V configuration with the center at 25-30ft and ends at 8-10ft above ground.

Suspension

wiring configuration

Wiring

wiring configuration

a photo of the wiring setup

Measurements

Initial SWR measurements, 2020-09-21

Long end of antenna only ~6ft off the ground, support rope on long end only ~20ft off the ground.

From shack

80m 40m 20m 17m 12m 10m 6m

Under antenna, with coax segment 1

80m 40m 20m 10m

After raising long end to ~8ft, 2020-09-23

Under antenna, with coax segment 1

  • red = straight
  • blue = with hand on coax ring

80m 40m

From shack

80m 40m 20m 10m 6m 2m

(Better on 2m than most of the bands it's supposed to work on...)

After raising rope on long end another ~5ft, 2020-10-06

The center is maybe a foot (or two??) higher than previously.

Under antenna, with coax segment 1

  • red = straight
  • blue = with hand on coax ring

80m 40m 20m 17m 12m 10m

From shack

80m 40m 20m 17m 12m 10m 6m

After adding choke, 2020-10-25

Under antenna, with coax segment 1

  • red = straight
  • blue = with hand on coax ring

80m 40m 20m 17m 12m 10m

From shack

80m 40m 20m 17m 12m 10m 6m