On 23 mar, 19:56, user wrote:
That is what I experienced.

I've constructed this:

Double dipole, vertical polarisation.

| | }
| | }lenght=75 cm = 1/4 wavelength
____A____ --width 1,5 meter = 1/2 wavelength
---------
| |
| |

I have a 20Kw tx at 1800meter/2000yard. That gives me probs with
interference. The double dipole is better than the Yagi.

Also directivity is good (all be it I do not have Forward/backward ratio).

I have taken pictures of the 2-dipole and the yagi:http://users.fulladsl.be/spb13810/loop/yagivs2dipool/

And here how the wiring is done: red and green represent solid copper wires:http://users.fulladsl.be/spb13810/lo...ag0030edit.jpg

Would it be an idea to use copper tubes?? And would that make the reception
better?? 1/4 inch / 1 cm copper tubing or even smaller??

Thanks !

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Hello "user"

Making the elements thicker will increase the bandwidth somewhat, so
it may give better reception at off-center frequencies. It will not
give better performance at the centerfrequency.

I have doubts about whether it will perform better then a good 5
element beam on the center frequency. Did you run some simulations?

Best regards,

Wim
PA3DJS
www.tetech.nl
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