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Antenna Matches - Baluns

Click to enlarge1:1 Current Balun by N5ESE
Here's another handy little Altoids QRP project. For Field Day 2002, I wanted to use my new Elecraft K1 (which has an automatic antenna tuner built-in) to feed a full-wave loop on 40 meters, to use on all bands 40 - 15. To preserve the feedline balance (I used 300-ohm ladder line), I needed a balun at the output of the K1's antenna tuner. This 1:1 balun did the trick quite nicely.

Click to enlarge1:1 Voltage Balun for HF wire dipoles by MUKD
Heres a neat 1:1 50 ohm balun for use on HF horizontal wire dipoles. It uses an AM radio ferrite rod, with 314 turns of wire. 10-14 turns should be good for 2-30MHz. I used 18SWG enammeled copper wire. It all fits in a small project box.

Click to enlarge1:4 Current Balun by N5ESE
Here's yet another handy little Altoids QRP project. This makes a great travel companion to the 1:1 current balun (described -here-), and is intended to aid in tuning a balanced antenna or feedline that has a high impedance (100-600 ohms).

Click to enlarge9:1 Magnetic Longwire Balun / Unun by MUKD
These are sometimes known as a Magnetic Longwire Balun. Its really an impedance transformer (9:1) to feed a high impedance, end fed (unbalanced) random wire which is likely to be a few hundred ohms, and transform it into something closer to a 50Ω (unbalanced) coaxial input, hence UnUn.

Click to enlargeBuild your own HF balun by EA4EOZ
A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cables. Many hams connect the center conductor of the coaxial cable to one side of the dipole, and the shield to the other. Wrong!

Click to enlargeEnd Fed Half Wave Antenna Coupler (EFHW) by MUKD
I have been experimenting with feeding end fed half wave antennas matched by a parallel tuned circuit coupler. This article will explain my findings and reasons for constructing it the way I did.

Click to enlargeHF 1:4 balun by PA3HCM
The first HF antenna I wanted to build was a Windom Antenna. This antenna required a 1:4 balun, so I made one.

Click to enlargeHomemade HF Antenna Balun by AA5TB
A balun is a device that is used at the feedpoint of a balanced antenna when an unbalanced feedline is desired to feed the antenna. Balun is a contraction for BALanced to UNbalanced.

Click to enlargeInspired by AA5TB and M0UKD, I built the following impedance transformer used to fed wire antennas with impedance between 1000-5000 ohms. Basically, this transformer convert the input impedance of 50 ohms to a much bigger one. A variable capacitor is used to tune the transformer to a given frequency.

Click to enlargeQRP Balun by AA5TB
I had a high permeability ferrite rod and an old B&W dipole center insulator in my junk box so I decided to construct a choke type balun for QRP use.

Creation date : 15/09/2007 @ 21:24
Last update : 14/10/2018 @ 21:30
Category : Antenna Matches
Page read 35973 times

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