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vova.gumerov

Carl Rothammel UHF antenna.

31 posts in this topic

Hello Admin. If you have the opportunity and time, please do a simulation! I wanted to make an ant. Spindler, but little free time!

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,,, okay, but for what TV channels .... ??

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The author points out that in order to increase the efficiency of ant. you can add reflector elements at a reasonable distance from the main ones. I added 2.

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49 minutes ago, Admin said:

Это было бы так ...

c5b1e0278fcf.jpg

Jomi, in your drawing is a two-meter Polish Dipole-half to 51 channels

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Vova, it looks like your antenna is not very good ... !!!

screenshot_592.jpg

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No need to make old antennas!!! How was it designed before? First you need to do a simulation according to the proposed dimensions ........

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8 hours ago, Admin said:

Vova, it looks like your antenna is not very good ... !!!

 

The antenna is very good. The classic SWR graph of the Uda-Yaga antennas looks like a double letter W. The first W is visible on the screen and the beginning of the second, as it seems to me. That is why I try to show the gain graph, and do not pay attention to the impedance in the figures. Impedance is important to the developer for tuning the antenna, and in the first approximation, the initial SWR and gain are important. If the gain in the range does not start to fall, then the antenna still has a margin up in frequency. I think you need to increase the dimensions a little and you get a great antenna.

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what happens if the FOLDED dipole is HORIZONTAL ?

 

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Distances to FIRST director and to REFLECTOR MUST be reviewed!

CAN't OPEN it ( NEWER version)

Edited by clanon

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Klanon, I built the antenna exactly according to the dimensions from the book

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OKAY , just talking about THIS (more info)

OE5KE.jpg

Edited by clanon

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Greetings admin. It didn’t work out with the laid out Yagi! I prepared two more drawings for the little Yagi.

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Hello Jomy! You can try to make a simulation of half of the Dipol, remove 3 directors and make the tube through the boom, it's more convenient. It might turn out to be a small antenna.

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,,,how "half of the Dipol, remove 3 directors and make the tube through the boom"...???

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