The Yagi Choke™ works on all bands from 20 meters through 6 meters.

It can be used in place of a coil-of-coax common mode choke. These are used in many antenna systems.

A Yagi Choke™ may also be used between your feedline and the balun supplied with your beam. This can improve feedline isolation and that can lead to a higher front-to-back and front-to-side ratio. For maximum effect, don't tape your coaxial feedline to a leg of your tower. Your tower acts like a vertical antenna and couples signals back into your coaxial feedline. This can reduce the antennas front-to-back and front-to-side ratio. It's like receiving on a beam and a vertical at the same time.

Moving your coax a few inches away from the tower and isolating it with a Yagi Choke can make a noticeable difference. To really keep RF off the shield of the coax, consider installing a second Line Isolator at the entry point to your radio room. A T-4 or T-4G is ideal for that application.

Link to the T-4 Line Isolator

Power Rating and Duty Cycle

* The Yagi Choke is rated for CW/SSB duty-cycles only. Not rated for AM, FM, RTTY or other high duty-cycle modes.
Higher power models may be available in the near future.


Available at the RADIO WORKS'™ Web Store

Introductory Sale Price
Yagi Choke™ Line Isolator $47.95
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You'll need a jumper cable to connect Line Isolators™ between equipment.

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Important Weatherproofing Information

Connecting the Yagi Choke™ to your antenna

To connect the Yagi Choke™ to your beam, you will need a coaxial jumper with a PL-259 connector on one end and whatever connector your beam uses on the other end. The are two popular connections to the beam antenna are direct wiring of the coax's center conductor and the shield. The other method is with a PL-259 connector. In either case, you can purchase an 18" RG-8X jumper from us with two PL-259 connectors installed. Read your antenna's instruction manual. If you are instructed to connect your coaxial feedline directly to the antenna's feedpoint, you can still use one of our jumpers and just cut off one of the coaxial connectors from one end of the jumper. Follow your beam's instructions which should provide detailed information on the procedure to prepare the coaxial cable for connection to your beam.

SEAL the coax with Coax Seal™ so that water or moisture cannot enter the coaxial cable.

For more information on Line Isolators™ In General

Button More detailed graphic on the operation of Line Isolators.
The information contained in the linked article applies to Line Isolators™ in general. The Yagi Choke™ is a special Line Isolator application.

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