Autor Tema: Da li je dipol mala antena?  (Posjeta: 843 )

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Offline 9a4qv

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Da li je dipol mala antena?
« : 27. Kolovoz. 2015, 23:15:46 »
Jedan od zanimljivijih videa koje sam pogledao u posljednje vrijeme:

https://www.youtube.com/watch?v=BZ0OTNFlTg0

Majstor na jednostavan nacin objasnjava neke pojmove koji se inace prikazuju kroz matematicke jednazbe i na kraju vecini nisu jasne.

Preporucujem pogledati, pogotovo "antena majstorima" koji naprave dipol za 160m koji ima samo 1m duzine  ;D

QV
"I do not think that the wireless waves I have discovered will have any practical application."
Heinrich Rudolf Hertz

Offline S59GS

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Odg: Da li je dipol mala antena?
« Odgovori #1 : 28. Kolovoz. 2015, 07:04:54 »
Kad je več reč o zanimljivijih videa- antenama devojčica tek 10 godina vrlo radostno demonstrira rad sa tasterima i opisuje magnetic loop anteno za 20 m .
https://www.youtube.com/watch?v=0DQyLMkSk5I

A few details about the easy to build 20m Magnetic Loop Antenna:

The capacitor is NOS Russian Vacuum Variable Capacitor - 4 to 100pf.
(EBay)
The copper pipe is 1/2 inch internal diameter. ( Rona in Canada / You could get the same in Home Depot or Zoro in the USA )
The connecting clamps are 3/4 inch made from copper. ( Home Depot )
When wrapped around 1/2 inch pipe - they fit just right.
Two of the screws tightening the clamps are plastic. The other two are metal.
The tuning "knob" is made from 1/2 inch PEX tube. The capacitor has a hole in the shaft - so I just used a small screw to connect the PEX tube.

The only special tool I used for this antenna was a pipe cutter that used for the copper pipes and the PEX tube. It cost around $10.

Watch How to use Morse Code Keys - Demonstration by 10 year old
« Zadnja izmjena: 28. Kolovoz. 2015, 07:15:55 S59GS »
73 GS

Offline s55m

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Odg: Da li je dipol mala antena?
« Odgovori #2 : 30. Kolovoz. 2015, 07:21:06 »
Tnx Adamski. Onda ništa od te yagi za 160m u škatuli od šibica :'(
Ali, što bi volio, da mi je Mona Jarrahi šef......sad mi je sef samo M..., :)
« Zadnja izmjena: 30. Kolovoz. 2015, 07:33:33 s55m »