Loading... Please wait...
  • My Account

Baluns

Every coax-fed balanced antenna should use a balun  

Every balanced antenna (e.g., Yagis and dipoles of all varieties) fed by coax cable, which is unbalanced, should have a balun of some sort at the balanced-to-unbalanced threshold - the antenna feedpoint - to attenuate common mode feedline radiation which can disrupt antenna patterns and contribute to RFI. We offer baluns from Texas Antennas (HF ferrite bead baluns) and InnovAntennas Ltd. (ferrite bead baluns optimized for the VHF and UHF bands) to suit a broad range of installations.

Ferrite bead baluns (also known as "Maxwell W2DU style" baluns honoring Walt Maxwell, who pioneered this balun technique) work well with antennas that cover wide frequency ranges and which are already well-matched at 50 Ohms and thus require no impedance transformation. This includes Force 12's new XR Series Multi-Monoband Yagis and InnovAntennas' DESpole multi-band rotatable dipole line. When coax passes through ferrite material its common mode impedance increases without changing its differential mode impedance.

Ferrite bead baluns also work well with monoband Yagis including all Force 12 and InnovAntennas Yagi including all LFA, LFA-Q, OP-DES and OWL designs, all of which are native 50 Ohm designs without power-robbing impedance transformation devices such as T-matches or hairpins.

Texas Antennas acquired the highly regarded Cal-Av balun line in 2012 and has maintained that company's high performance and high quality standards. Texas Antennas baluns are protected from the elements by a PVC cylinder vacuum resin impregnated to keep moisture out. Each Texas Antenna balun has been 500 VDC Hipot tested with each lead also 3 Amp continuity tested. Texas Antennas baluns are made in the USA and exclusively use genuine Amidon ferrite beads, silver Teflon coax and high quality Teflon dielectric coax connectors. Detailed information on Amidon ferrite material's magnetic properties here.

Coax choke baluns (also known as "coiled coax," "air choke" or "ugly" baluns) have less bandwidth than external bead baluns but are nevertheless very effective - and cost effective - with monoband Yagi and dipoles including all Force 12 and InnovAntennas LFA, LFA-Q, OP-DES and OWL Yagi designs. Coiling coax cable in a particular way creates coil inductance and distributed capacitance which resonates as a parallel trap whose high impedance inhibits common mode feedline current. Contact us for info on building your own Coax choke balun for your Force 12 or InnovAntennas antenna.

If our stock baluns don't precisely fit your needs please contact us for a quote on a custom model built to your specifications.

"I use a Cal-AV 1:1 balun on a large 20 meter aluminum rotatable dipole and it is completely transparent to its operation.  My two antenna analyzers (from MFJ and RigExpert) both indicate a nice 1.2 SWR with virtually no insertion loss, and the antenna works swell, with no RF in the shack or along the feed line....this is good insurance against unwanted feed line radiation....It is lightweight, but is solid and well made."  K8JHR eHam product review

"These (Cal-Av) baluns are the 'real deal'"  VE7RF eHam product review

"I installed this (Cal-Av) balun on my Hustler 5-BTV vertical and great result, NO RFI " VK6WB eHam product review

Categories