Zuhause> Blog> Suitable for homemade small antenna

Suitable for homemade small antenna

November 27, 2023

Really small, suitable for homemade CobWebb antenna with omnidirectional 7dBi gain.
The original inventor was the British G3TPW,
Website: http: //

14, 18, 21, 24, 28 MHz five bands, 7dBi gain, the size is only 2.6 meters square.
It is much smaller than the Moxon antenna, and there is no blind spot in all directions, no need to use the diverter to turn around.

eHam's evaluation of the antenna is not bad, http: //

The inventor sells the finished antenna for about £ 300.

Some enthusiasts on the Internet have successfully made their own homes, as long as five 4-5 meters of FRP fishing rods and 50 meters of wires can be easily made.
It ’s Ham ’s preferred antenna for space constraints. Let ’s do it together.

Self-made design drawings:
It is the size of the inch system, please change it yourself.
1 inch = 25.4 mm 1 foot = 12 inches
Notes on impedance matching:
The inventor said that his antenna is gamma-matched, but most of the homemade Ham uses a 1: 1 balun.
In addition, Ham said that a 3-inch gap between the two vibrators is important for matching.
Using 1: 1 balun, start the adjustment in the order of low-band to high-band, starting with 14MHz, then 18MHz, 21MHz, 24MHz.
After looking at this antenna, I feel that it is relatively easy to make, and the material is relatively cheap. I have the following points to ask:

1. Trouble explaining the text in the basket. It's a little vague and unclear.

2. Is the size in the green frame the size of the fixed point along the guide line of the support bar from the center point?

3. Are the feed points of several bands directly connected together?

4. Is one of the wires cut off at the center of the opposite side of the feed point? (I see it is a double-stranded wire, the other photos seem to be cut off, and the picture is not clear)
1. Approx 3 "GAP (approximately 3 inches apart), the top one of the unclear size is 5 feet 6 inches, the other two are 4 feet 10 inches, and the other is 4 feet 5 inches. The stock theorem is calculated by itself)

2. Correct.

3. Correct.

4. Both of them are cut off, and the 3-inch interval is connected by insulating material.

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