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checcoanz

dipole position 2600mhz

hello everyone I am doing the yagi uda DL6WU antenna at 2600mhz I would like to ask only if the dipole goes lower or higher in the boom or is it okay?. some time ago I created a 2,4ghz yagi and thanks to your dipole measurements it worked !!

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Thank you. I wanted to kindly ask about things:
what is the difference between isolated and non-isolated boom ?. in the dipole it tells me that I have to use a metal wire of 0.4mm, if I use copper wire of 1.5mm it is not good?

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Yes it is that. the only thing is that the diameter of the copper dipole is 0.4mm, I have 1.5mm in the house, can it be okay? 

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bigger diameter most of the times means wider bandwidth (wich is GOOD) some changes in impedance may occur (folded dipole won't change much) it's always 4 times that of a single dipole in free space 288ohm...(that's the reason why you need a BALUN 4:1 most of the times)

"The impedance of this antenna is around 300 Ω, so you may want to use a transformer or a λ/4 long piece of 120 Ω coaxial cable to match this impedance to 50 Ω. "

Use styrofoam to hold it (polystyrene FOAM , the lighter the better)

Edited by clanon

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38 minuti fa, clanon ha detto:

diametro più grande la maggior parte delle volte significa larghezza di banda più ampia (è BUONA  ) è sempre 4 volte spazio libero quella di un singolo dipolo 288ohm ... ( questo è il motivo per cui hai bisogno di un BALUN 4:1 la maggior parte delle volte)

"L'impedenza di questa antenna è di circa 300, quindi poter voler utilizzare un trasformatore o un pezzo di cavo coassiale da 120 lungo λ/4 per abbinare questa impedenza a 50."

Usa il polistirolo per tenerlo (polistirene FOAM, più leggero è, meglio è)

ok I understand, now I will find a 0.4mm metal wire for the dipole and with the other elements I use 1.5mm copper wire

Edited by checcoanz

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Captura.JPG

BANDWIDTH at 0.4mm diameter would be THIN (some Mhz) thin wire High Q Factor , small bandwidth

Edited by clanon

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BANDWIDTH at 0.4mm diameter would be THIN (some Mhz) thin wire High Q Factor , small bandwidth ie what does it mean?

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Il 8/9/2021 alle 16:11, checcoanz ha scritto:

 

 

On 8/9/2021 at 15:38, clanon said:

diametro più grande il più delle volte significa larghezza di banda più ampia (che è BUONA)  possono verificarsi alcuni cambiamenti di impedenza (il dipolo piegato non cambierà molto) è sempre 4 volte quella di un singolo dipolo nello spazio libero 288ohm ... (questo è il motivo per cui hai bisogno di un BALUN 4:1 la maggior parte delle volte)

"L'impedenza di questa antenna è di circa 300 , quindi potresti voler utilizzare un trasformatore o un pezzo di cavo coassiale da 120 lungo λ/4 per abbinare questa impedenza a 50 Ω."

Usa il polistirolo per tenerlo (polistirene FOAM, più leggero è, meglio è)

if I do the dipole with 1.5mm copper with the same measurements is it okay or do I have to do it from 0.4mm?

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