7-band OCF dipole: Difference between revisions
Firespeaker (talk | contribs) |
Firespeaker (talk | contribs) |
||
| Line 102: | Line 102: | ||
[[File:2020-10-25 shack 10m.jpg|200px|10m]] | [[File:2020-10-25 shack 10m.jpg|200px|10m]] | ||
[[File:2020-10-25 shack 6m.jpg|200px|6m]] | [[File:2020-10-25 shack 6m.jpg|200px|6m]] | ||
[[File:2020-10-25 shack 2m.jpg|200px|2m]] | |||
[[Category:Amateur radio]] | [[Category:Amateur radio]] | ||
Revision as of 21:47, 25 October 2020
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
.png)
Wiring
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
Under antenna, with coax segment 1
After raising long end to ~8ft, 2020-09-23
Under antenna, with coax segment 1
- red = straight
- blue = with hand on coax ring
From shack
(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
From shack
After adding choke, 2020-10-25
I made a guanella-like choke, with 17 turns of RG-58/U coax around an FT240-43 ferrite. I found a perfect length of coax with just the right terminals, an old Radio Shack length.
Under antenna, with coax segment 1
- red = straight
- blue = with hand on coax ring
From shack
