March 29, 2017

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A good source of the required components is The Wireman, Inc (see Address List in References). The required components are a package of 50 type FB73-2401 ferrite beads (Wireman part #912B), 15 inches of RG-303 coax, and two coax connectors (UHF connectors [PL-259s; the Wireman’s #702] with inserts [UG-175s; the Wireman’s #704] for installation on RG-58 coax, or N connectors intended for installation on RG-58 [UG-536B/Us, available as the Wireman’s #737). Although the Wireman sells these parts bundled as part of a W2DU Balun kit [#833], the coax in the kit is too short to accommodate the connectors, so I recommend ordering the parts individually instead of buying them as The Wireman’s W2DU Balun kit.

The Transmission Lines chapter gives capacitance per unit length in its table of coaxial-cable characteristics. The ends of the coaxial capacitors must be sealed to prevent water ingress. 55—At A, 40-m SWR curve. At B, measured SWR curves for 80 m. Curves representing two different series capacitor values are shown. Cork Your SO-239 Connectors! Those little red plastic caps (CAPLUGS) that are used to protect unused coax (SO-239) connectors from moisture, dirt and damage are expensive if you are lucky enough to find them.

At the lower frequency of 100 to 300 Ω. Within that range it is not critical. the trap will act as a loading The trap is built and adjusted separately from the antenna. It inductor, adding electrical should be resonated at the center of the portion of the band to be length to the total antenna. operated. 05 MHz. Resonance is checked by using a dip meter and detecting the dipper signal in a calibrated receiver. Once the trap is adjusted it can be installed in the antenna, and no further adjustment will be required.

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