Model 49130 - 49:1 - 80-10m EFHW - 250 watts

Balun Designsis now offering this low power alternative in a stacked core configuration  for those who want to use an End Fed Half Wave for portable or temporary installations.  Built with the same craftsmanship as all our other units, this new model provides excellent flexibility and portability for events such as Field Day, POTA, SOTA etc. With this particular unit, the coax shield of the feedline acts as the counterpoise for the antenna so the feedline used should be a minimum of about 0.05λ of the lowest band being used.  As an example, this calculates to ≈ 4.2 m or ≈14 ft for an 80m EFHW.  The  optional counterpoise stud allows the use of a wire in lieu of the coax for the counterpoise.

BNC & N connectors are available in "Accessories & Connectors" section of our website

When used at full power rating of 150 watts, the antenna must have a low SWR on the band selected and be used on a 50% duty cycle.  In addition, use on digital modes such as FT8 should be held to 50 watts maximum.  Any SWR measurement taken with the transformer at the feedpoint should not exceed 1.5:1 with NO tuner in use.  There are numerous configurations available online that will accomplish this on multiple bands (Google search "end fed half wave antennas").  If the transformer is used with an external tuner in conjunction with a single wire antenna typically 130-135 feet in length, power should be reduced on those bands that show an SWR above 1.6 to 2:5 without the tuner.  A level of 100-125 watts is the maximum with a further reduction on any band measuring above 3:1.

 **CAUTION**

The enclosure for our low power units is small, lightweight and portable but is not weatherproof  and not intended for long term or permanent outdoor use. If used in a permanent outdoor installation, additional attention must be given to weatherproofing and strain relief. Damage caused by such use is not covered under our warranty.

Specifications