Difference between revisions of "Balun Buatan Sendiri 1:1"

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(New page: Sumber: http://195.84.101.101/~goranl/building/aircore_balun/index.html - 1:1 HomeBrew AirCore Balun - 2007.05.20 Made this 'AirCore' balun for use with a singe band portable 80M dipole...)
 
 
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This type of balun is normally used with broad-band or multi-band wire antennas,- where gamma-match or other narrow-band matching is not suitable. The baluna is also suitable for use with logo-periodic or multi-band directional Yagi antennas.
 
This type of balun is normally used with broad-band or multi-band wire antennas,- where gamma-match or other narrow-band matching is not suitable. The baluna is also suitable for use with logo-periodic or multi-band directional Yagi antennas.
  
 
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[[Image:Aircore balun.jpg|center|200px|thumb]]
  
 
- Technical data -
 
- Technical data -
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(On the images below i use 2mm Cu wire, the measurements given in this text is calculated using 1,5mm cu-wire)
 
(On the images below i use 2mm Cu wire, the measurements given in this text is calculated using 1,5mm cu-wire)
  
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[[Image:Closeup2.jpg|center|200px|thumb]]
  
 
Ready made coil and the test setup
 
Ready made coil and the test setup
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To this moment my only test is the frequency respons shown here. I also need to make som loss/return loss measurements.
 
To this moment my only test is the frequency respons shown here. I also need to make som loss/return loss measurements.
  
 
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[[Image:Respons setup.jpg|center|200px|thumb]]
 
Test setup
 
Test setup
  
 
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[[Image:Balun respons.jpg|center|200px|thumb]]
 
Frequency response using mini-vna
 
Frequency response using mini-vna
  
 
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[[Image:Parts1.jpg|center|200px|thumb]]
 
Parts before final assembly
 
Parts before final assembly
  
 
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[[Image:Parts2.jpg|center|200px|thumb]]
 
Inside of so-239 connector at balun bottom
 
Inside of so-239 connector at balun bottom
  
 
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[[Image:Parts3.jpg|center|200px|thumb]]
 
Connection cable to balune core connections
 
Connection cable to balune core connections
  
 
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[[Image:Parts4.jpg|center|200px|thumb]]
 
Internal assembly for the antenna Wire attachment and hanger pulley
 
Internal assembly for the antenna Wire attachment and hanger pulley
  
 
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[[Image:Parts5.jpg|center|200px|thumb]]
 
Drain hole at balun bottom
 
Drain hole at balun bottom
  
 
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[[Image:Parts6.jpg|center|200px|thumb]]
 
Antenna Wire attachment and connections
 
Antenna Wire attachment and connections
  
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* http://195.84.101.101/~goranl/building/aircore_balun/index.html
 
* http://195.84.101.101/~goranl/building/aircore_balun/index.html
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==Pranala Menarik==
 +
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* [[Coaxial trap antenna]]
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* [[Antenna: Membuat CoaxTrap]]
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* [[Antenna : TRAP-dipole untuk 20m dan 40m band]]
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* [[Antenna: Endfed Long Wire]]

Latest revision as of 07:51, 14 July 2022

Sumber: http://195.84.101.101/~goranl/building/aircore_balun/index.html


- 1:1 HomeBrew AirCore Balun - 2007.05.20 Made this 'AirCore' balun for use with a singe band portable 80M dipole. The manufacturing is quite simple and the result is a nice and very 'Heavy Duty' baluna.

This type of balun is normally used with broad-band or multi-band wire antennas,- where gamma-match or other narrow-band matching is not suitable. The baluna is also suitable for use with logo-periodic or multi-band directional Yagi antennas.

Aircore balun.jpg

- Technical data -

SPECIFICATIONS

============================

Frequency responce ... 3-30 MHz Maximun Input Power .. At least 1 KW Input Impedance ...... 50ohm unbalanced Impedance ratio ...... 1:1 (In/Out) Dimensions ........... Weight ...............


- Making the balun -


Balun coil layout1d1.jpg

Principle - The coils on an air balun is not different from an Ferrite-balun, in the layout above you see the principle. Two coils (Yellow & red) is used as straight thru-feed, one for center conductor an the other for the shield conductor, they are connected directly to each dipole half, The blue coil is used for reversed 'pick-up' and balances the dipole connections.

Balun d1.jpg

The Air-balun is made on a plastic 'Nonconducting' core,- Use a pice of plastic tubing about 25mm in diameter and about 66mm long. Drill tree 2mm holes,- slightly in diagonal in one end, whith about 5mm distance. drill tree 2mm holes in the same manner in the other end of the tube,- distance between the two hole-rows is 49mm.

(On the images below i use 2mm Cu wire, the measurements given in this text is calculated using 1,5mm cu-wire)

Closeup2.jpg

Ready made coil and the test setup

Hint! It is best to make one coil at the time, dont trye to put al tree on the core at once.

- Testing the balun - To this moment my only test is the frequency respons shown here. I also need to make som loss/return loss measurements.

Respons setup.jpg

Test setup

Balun respons.jpg

Frequency response using mini-vna

Parts1.jpg

Parts before final assembly

Parts2.jpg

Inside of so-239 connector at balun bottom

Parts3.jpg

Connection cable to balune core connections

Parts4.jpg

Internal assembly for the antenna Wire attachment and hanger pulley

Parts5.jpg

Drain hole at balun bottom

Parts6.jpg

Antenna Wire attachment and connections


Referensi


Pranala Menarik