Wire Antennas for the Beginner - American Radio Relay …
orienting the feed line as symmetrically as possible with respect to the radiator, run- ning the cable at right angles to the anten- na. Chances are, you won't need any extra devices at the feed point. Direct coaxial feed usually works fine. Multiband Dipoles Separate dipoles for each band is an ex- cellent antenna system if you have room.
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A Home-made Ultrasonic Power Line Arc Detector
www.arrl.orgFrom April 2006 QST © ARRL Figure 2 — Ultrasonic dish assembly. Figure 1 — Simplified block diagram of the ultrasonic detector. at full blast, and the ...
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www.arrl.organd The Ultimate Transmatch BY LEWIS G. MCCOY, *WIICP OME amateurs assume that because they use coaxial feed lines they don't need a Trans- match.
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www.arrl.orgThe QN signals listed above are special ARRL signals for use in amateur cw nets only. They are not for use in casual amateur conversation. Other meanings that may be used in other services do not apply.
Lightning Protection for the Amateur Radio …
www.arrl.org50 July 2002 also be protected. The method of protection will change, how-ever, since the interface is electronic. Once the peak operating interface voltages are determined, it is relatively straightfor-
Field Day - arrl.org
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Registration Form - American Radio Relay League
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www.arrl.orgQEX – May/June 2013 7 important role in the generator. A DDS chip like this one builds the waveform using discrete voltage samples whose amplitudes
A Quick Trainer and Field Resource Guide for the …
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