See also “ General Conditions for Safe use of ON7FU Ferrite Applications products” under the tab “LEGAL INFO”.
Tamper proof, UV resistant polycarbonate housing.Intrinsic VSWR: As a rule of thumb, limit power to 3/1 and limit to 5/1. 2400 W PeP VSWR 2/1, some power de-rating has to be applied.ground rods with additional radials).įrom August 1st 2018 on, all BALUNs are built into UL508A certified polycarbonate enclosures provided with flanges for convenient installation. Optimum results can be expected when the transformer is installed near the ground, with its “cold” side connected to a good RF ground. Often, some experimenting is needed to achieve a good compromise and optimum results. This transformer thus acts as a “Pre-Match Unit”. In order to transform the average feedpoint impedance of the antenna within the comfortable tuning range of an good a-symmetric antenna tuner, a 9/1 UNUN impedance transformer is often used. The feedpoint impedance of such a “random” wire length (referred to ground) varies widely, depending on the frequency used and the setup shape of the antenna. Mostly, the antenna wire is installed in an “Inverted L”, “or “slooping” configuration. Longer wire lengths give some gain, and allow more efficient use of the lower amateur radio bands. Lengths can vary between some 9 meters until the longest length feasible. The endfed multiband “longwire” antenna is a popular and simple wire antenna that is often used to be QRV rapidly on several different amateur radio frequency bands.ĭepending on the on-site possibilities, different wire lengths can be chosen. High Power 9/1 UNUN as “pre-match unit” for use with multiband endfed non resonant longwire antennas.
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