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W2AU 4:1 - Voltage W2DU 1:1 - Choke

Baluns & Ununs for Amateur Applications

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LDG RU-4:1 Unun Remote 1:1 Balun RF Isolator - ISO-Max LDG RBA-4:1 Remote 4:1 Balun
Our Price: $29.99
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Our Price: $31.99
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Our Price: $31.99
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Our Price: $32.99
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LDG RU-4:1 Unun Remote 1:1 Balun RF Isolator - ISO-Max LDG RBA-4:1 Remote 4:1 Balun
LDG RU-4:1 Unun Product Manual The ISO-Max RF Isolator is the type of accessory every ham shack needs. ISO-Max keeps unwanted RF from traveling on the shield of your coax - keeping RF out of computers, transceivers, equipment chassis, microphones, keys, everything@

This is the same unwanted RF that cause "RF bite", equipment lockup and so many other pesky problems.

The ISO-Max has two SO-239 female receptacles to accept male PL-259 cables.

7 inches long. 50 Ohm. For HF frequencies between 1.8 and 30 MHz. This unit can handle 4 KW.

Recommended install points: Transceiver output, antenna tuner output, amplifier output, mobile installations*

This unit is also perfect for portable, emergency and field day situations.

*Stay RF in a mobile environment can cause damage to/or render inoperative your cars sensitive electronics.

Product Manual
W2DU TYPE 1:1 HF Choke Balun
Our Price: $42.65
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W2DU TYPE 1:1 HF Choke Balun
This 1:1 Choke (Current Balun) is ideal for HF applications from 1.8-30 mHz.

HF Balun Theory -- Does my HF Antenna Need One?

Hams have been building monoband dipole antennas without using a balun since coaxial cable first became available many years ago. And, they work.

Quick Product Links and Definitions:

VHF Baluns

Baluns and Dipoles

However, technically it is best to use a balun with your half-wave monoband dipole when using coaxial cable as the feedline. A balun is used to connect a balanced antenna ( the half-wave dipole) to an un-balanced feedline ( the coax).

Current Baluns Explained (Choke Baluns)

There are different types of baluns; One to One (1:1), Four to One (4:1), Voltage Baluns, Current Baluns; a One to One (1:1) Current Balun is the balun of choice for a single band dipole application. Current in an antenna is what radiates and the current type balun will force equal current into each leg of the dipole antenna. Balanced current distribution along the halves of the antenna means best radiation pattern shape and antenna efficiency. Current-type baluns provide the desired interface between unbalanced coax and balanced antennas.

The balun also helps prevent current flowing on the outside of the coax. Otherwise, when this current (called common-mode current) appears on the outside of the shield, the feedline behaves as if it were an antenna.

Further Antenna Information for the Amateur Radio Operator

Additional in depth and related information can be found in a number of interesting sources on how to build a balun, constructing a HF Dipole antenna, as well as, multi-band dipole antennas. Antenna handbooks, articles, and other resources are readily available.