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Antenna KAPPA

30 posts in this topic

The antenna is intended for reception of TV channels 21-60

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KAPPA.cst

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hello Jomi. How are you and your health? Sorry to write in Russian, it's more convenient for me to express it! I have a big request for you! You can calculate the Yagi antenna for 690-770 MHz. If you do, then I will write what materials there are. Thank you in advance!

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,,, hello Vova, I'll try to see how we solve it ... !!!

,,, but as you can see, this antenna works in your frequency range .... !!!

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Yes Kappa is not a bad antenna, but it is broadband! But I would like to make a real antenna, designed according to the program for my range and from my own materials! You can make a mouthguard, but it's problematic !!!!

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,,, yes, the antenna I simulated above, works very well on the frequency of 0.8 GHz...!!!

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Hello Jomi! You probably forgot about me? Yes, it is clear that there is not enough time for everyone! I wanted to ask. Did you try to simulate Spindler's Yagi antenna, because you did Kappa! These are all antennas from the times of the USSR and were made according to GOST. By the way, the Kappa plant is still operating in my city. And according to Shpindler, I'm certainly interested in my range 690-770 Interestingly, before there were no devices or programs !!!!!!! ... Sorry in Russian.

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You have some antenna sketches from Splinder's book....???

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There is a PDF file at home.

By the way, Jomi, it is on the internet with a breakdown of sizes by channel! If you optimize then 10 email. option!

  Like this

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from 690 to 770 you could use a NORMAL tube dipole NOT FOLDED but TUNING the TUBE's  diameter 

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How many elements...GAIN...? do you need 

and WHICH KANAL ?

what tubes do you have?

Edited by clanon

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colleague, Clanon, at one time I made a lot of dipole antennas, which are still with friends. Yes, simple and reliable !! On radio sites, there is a lot of controversy and discussion about Spindler's antenna. I still have this one counted at 2600, it works great !!! So I thought to do it for TV, but I would like to optimize !! There is an AL tube. 8 10 and 12mm. Boom - round 20mm 25mm and 18mm Square 15x15

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It is necessary to overlap 2 channels 706 and 754 MHz

10 items will be ok. Reflector is the same Noise immunity is very important

 

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it promise more than 10 dbi (still working on it)

Captura.JPG

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This channels ? more or less...KANALs ...? if only TWO channels we need TWO dipoles if ALL channels only one dipole

Captura.JPG

Edited by clanon

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better with one!

I thought so!

Clanon, they brought me an AL strip today. 15x2mm. This is in addition to the material I wrote to you yesterday!

 

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19 hours ago, vova.gumerov said:

better with one!

I thought so!

Clanon, they brought me an AL strip today. 15x2mm. This is in addition to the material I wrote to you yesterday!

 

?

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so far i'm using 

Boom 15x15 square (1mm)

tubing 8mm (1mm thick)

DIPOLE  15 x 2 mm 

12dbi could be achieve with 7 + 3 elements BANDWIDTH is the hard thing to achieve (More than 50mhz)

Edited by clanon

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Thank you very much, Clanon, for your work! Add as many elements as needed. Then I will use without an amplifier.

A dipole made in this way is very good from reactivity

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oh it's a long antenna !!!!! I thought that you already calculated the antenna for me and that for 12dbi you need to add + 3 elements ???

Clanon, for one good small antenna, they will give 2 long ones !!!!

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1 hour ago, vova.gumerov said:

oh it's a long antenna !!!!! I thought that you already calculated the antenna for me and that for 12dbi you need to add + 3 elements ???

Clanon, for one good small antenna, they will give 2 long ones !!!!

On 11/24/2021 at 7:43 PM, vova.gumerov said:

better with one!

I thought so!

Clanon, they brought me an AL strip today. 15x2mm. This is in addition to the material I wrote to you yesterday!

 

Vova, this antenna is not broadband. It covers 2 adjacent channels. It is not suitable for your requirements. How long do you want the antenna to be?

http://radiotech.inf.ua/Shematic_PCB/HFtehniks/shpindler_anten.htm

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is a great design you can USE the length you want , taking directors OUT from the TIP back (reducing GAIN)

the BALUN losses and bandwidth is of most importance

Edited by clanon

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