Amateur antennal feedline lengths

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ZL2iFB amateur radio antennas. [Here is the Excel file, now including a sheet with imperial measurements as well as the original metric version, and some notes on matching stubs]. A feedpoint insulator/connector, with a balun if you are feeding a balanced antenna with coax (e.g. a .

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Incorrect feedline and antenna lengths can make an antenna system very difficult or impossible to tune. This problem often occurs on 80 meters if an odd quarter-wave (60 to 70 foot) open wire line is used to feed a half-wave ( to foot) dipole.


Sep 05, · What is the best antenna feedline length? Discussion in 'General Technical Questions and Answers' started by VE3PCD, Sep 4, Thread Status: Not open for further replies. Page 1 of 2 1 2 Next > VE3PCD Ham Member QRZ Page. Is there an optimum Antenna Feedline Length for mobile installations? Ask Question 7. 1 $\begingroup$ I bought a ham radio antenna mounting kit for my car that includes ~16' of coax. That makes sense why the feedline length could affect antenna performance/SWR, but then brings up another question for me. Does effective grounding of mobile.
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charts of feedline lengths: This page contains tables showing usable feedling lengths (L F) for 3 different sizes (L D) of antennas. It also shows lengths for .

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A popular type of feed line for HF use is ladder line. In fact, at HF frequencies it is the most common feed line for random-length dipoles and other antenna designs. Ladder line consists of nothing more than two wires in parallel separated by insulating material. When . Here is a list of favored Dipole lengths:* 40 to 41 meters - to ft. 34 to 35 meters - to ft. 26 to 27 meters - 85 to 88 ft. Feedline Lengths: The feedline length is also an important part of a "friendly" antenna design. When calculating optimum lengths, we .

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Antenna Tuner Matching & Feedline Lengths This is a recurring popular topic in our morning QSOs on 75 m. Multiband operation of a single antenna system results in a wide range of impedance at the transmitter end of the feedline. There are a lot of important components to your amateur radio, but your antenna can make or break it, even if you have everything else tight! You may have used this at one time to connect your TV to a VHF antenna. Parallel conductor feed line consist of two conductors held Signal resistance increases with feedline length. Always cut.

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7 Responses to “What type of feedline coax should I use for my antenna” Leonard July 17, at pm # I am interested in the copper j-pole antenna, being a fairly new Ham I’ve had a number of antenna . A look at antenna feedlines for amateur radio antennas Feed the Beast -- Thoughts on Antenna Feedlines. Feeding the Beast—Transferring Radio Frequency Energy from Your Transmitter to Your Antenna the distance between the two conductors must remain the same for the entire length of the feedline or it begins to mess with the impedance.
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amateur radio antenna cable coax feed line ham radio lmr rg-8 About Michael Martens A licensed amateur radio operator since and earning his Extra Class license in , Michael is the Owner of KB9VBR antennas and regularly writes his blog on antennas, emergency communication, amateur radio technology, and operating. Antenna feed lines and coax cables is a curation of resources about, Detuning Towers, Verticals. Ground systems and some history, Transmission lines for dummies, Rolling your own balanced feed lines, Feeding the Beast. Resources listed under Feed Line category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators.

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