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Author Topic: Best dummy load antenna?  (Read 7694 times)
K1WJ
Member

Posts: 460




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« Reply #15 on: January 30, 2014, 07:45:56 AM »

I do not use a tuner. No tuner is needed.
The antenna is adjusted to be a 1/4 wave vertical on band of choice 6m - 20m.

Example: 20M = 468 divided by Freq     = 468/14.200 = 32.9 feet , Now divide 32.9 by 2 = 16.47 feet is the length of the telescoping whip. Now the single raised radial should be cut a few inches longer call it 16.8ft.

The base of the antenna needs a 3/8th 24 connector antenna mount, very common, to mount to vertical 4ft mast.

The radial is attached to the mount housing one of the 4 mounting bolts.
Set vertical element at 16.47ft, and check swr with radial attached & elevated also 4ft off the ground.

If swr is high take 2inches off the radial length - check swr again. SWR go down? Yes going the right way.
Keep repeating until swr is 1.5to1 or lower.
Every time you cut radial use smaller length cuts, because you are getting closer to good swr.
Remember you can also shorten or legthen vertical element for lower swr.
Keep other antennas & metal away from antenna while tuning.  See pic on K1WJ on QRZ - 20m antenna in bucket.
 73

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