Carl Rothammel UHF antenna.

[vova.gumerov 23]

Carl Rothammel UHF antenna.

[vova.gumerov 23]

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

[Admin 2545]

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

[vova.gumerov 23]

Rothammel indicates 470-790MHz

[vova.gumerov 23]

I wonder what this antenna is like!

[Admin 2545]

That would be ...

[vova.gumerov 23]

[vova.gumerov 23]

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.

[vova.gumerov 23]

49 minutes ago, Admin said:

Это было бы так ...

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

[Admin 2545]

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

[vova.gumerov 23]

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

[vova.gumerov 23]

Jomy, delete the post! He doesn't belong here.

[Harry36 140]

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.

[clanon 246]

what happens if the FOLDED dipole is HORIZONTAL ?

 

[Admin 2545]

,,, this happens if ...

 

Yagi.cst

[clanon 246]

Distances to FIRST director and to REFLECTOR MUST be reviewed!

CAN't OPEN it ( NEWER version)

Edited January 20, 2022 by clanon

[vova.gumerov 23]

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

[clanon 246]

OKAY , just talking about THIS (more info)

Edited January 20, 2022 by clanon

[clanon 246]

18dbi

[vova.gumerov 23]

this is serious.

[vova.gumerov 23]

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

[vova.gumerov 23]

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.

[Admin 2545]

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

[Harry36 140]

On 20.01.2022 at 10:21 PM, clanon said:

OKAY , just talking ,,,,,,,,, (more info)

 

3D Printed Uda-Yagi )))

http://www.mwelectronics.ru/2018/Papers/058-062.pdf

[Harry36 140]

50Ω Direct Feed from AMagus (2014 and old version)

 

uda_yagi_folded_dipole_TV_magus_2014.06_td.cst