coaxial cable

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Squarooka Antenna - squared bazooka for 2 meters band - Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel. In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
[ Hits: 356 | Votes: 0 | Rating: 0 ]

40m Magnetic Loop Antenna - A coaxial cable tuneable magnetic loop antenna for 7MHz. This experimental antenna does not require a tuning capacitor
[ Hits: 3591 | Votes: 4 | Rating: 8.75 ]

Corned Fed Delta Loop - Author found a ratio between the lengths of the sides of the Delta Loop that give reasonably low SWR into a 50 ohm coaxial cable almost independent of the high above ground and other surroundings. This ratio also gives good results no matter orientation. Includes an online delta loop antenna calculator.
[ Hits: 168 | Votes: 0 | Rating: 0 ]

Build your own HF balun - A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cable. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the real shield, this is, ground) and the external shield, who is really far to be ground. In this way, your dipole has 3 arms, the two from the dipole and the coaxial cable shield (external face)
[ Hits: 248 | Votes: 1 | Rating: 10 ]

How to build a Coax Balun 1:4 and 1:1 - An air-wound balun made with coaxial cable can not become saturated because no powder iron or ferrite core is present. In this article author explains and compare coax baluns to ferrite baluns with comparison tables and detailed pictures
[ Hits: 577 | Votes: 8 | Rating: 8.63 ]

Build a Simple VHF Dipole Antenna for 2 Meters: A Beginner's Guide - This article serves as a beginner-friendly guide to constructing a simple VHF dipole antenna for 2 meters, perfect for novices in the hobby. With an emphasis on affordability and simplicity, it explains the basics without overwhelming technical details. Recommendations for coaxial cable and mounting methods are provided, offering practical solutions for effective communication. By following these instructions, novices can build a functional antenna without breaking the bank.
[ Hits: 113 | Votes: 1 | Rating: 7 ]

Trap on Coax Cable - A trap on the coaxial cable, also known as choke, helps to eliminate the sneaking of the reflected RF- energy to the shack. The trap can be made from the coaxial cable that feeds the antenna
[ Hits: 964 | Votes: 2 | Rating: 6.5 ]

Optimizing Coax-Cable Traps - A document that will guide you on Coaxial-Cable trap optimization process to gain on global antenna performance and on increasing effective bandwidth.
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FBK 2m-70cm dualband coax antenna - A travel, or a fixed vertical coax antenna originally designed by PA0FBK. This antenna is very easy to make from a piece of 50 ohm or 75 ohm coaxial cable, and can be either smooth, roll-up version, or rigid cable
[ Hits: 354 | Votes: 3 | Rating: 9.33 ]

20-30m Vertical Antenna - Homebrew project for a vertical antenna with a coaxial-cable trap, that works on 20 and 30 meters band.
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Gigatronix Coax Cables - Manufacturers of Coaxial Connectors, Push-Pull Latching Connectors, Coaxial Cable, Multicore and Coaxial Cable Assemblies based in UK
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Volda Communication - Volda is specialized in telecom tower antenna line accessories such as cable hangers, coaxial jumpers, grounding buss bar kits, pole clamps.
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Coax Loss Calculator Online by K5VR - RF Feedline (Coax and Ladder-Line) Loss and ERP Calculators made with Javascript. This complex feddline loss calculator has already several line types paramenters for most common coaxial cables from Belden, Time LMR, Wireman and other common products. Result will give Matches loss, SWR loss, dB and Watts power loss.
[ Hits: 252 | Votes: 2 | Rating: 5 ]
Coax Cable Attenuation and Power Handling Online Calculator - An on-line coaxial cable attenuation and total power handling calculator, with a lot of cable properties already configured to give the Nominal Attenuation, Maximum Cable Assembly Insertion Loss, Average Power, Cable Vg anf Nominal Td
[ Hits: 229 | Votes: 2 | Rating: 2 ]
How to assemble a BNC connector - How to install a BNC connector on a coaxial cable like the ELSPEC1030AF / HPF195RG and 58C/U cables
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Everything You Need To Know About Coaxial Cable - An technical page on coaxial cables that describes what coax cables are, how do coax cables works, what are RG cables and difference with several coax cable types, what they are used for, connector types and cable sizes
[ Hits: 158 | Votes: 0 | Rating: 0 ]
Coax Attenuation Chart - Tables with attenuation in DB per 100 feet of several coaxial cables.
[ Hits: 353 | Votes: 5 | Rating: 3.4 ]

Grounding HF Transceiver using Coax Cable - Improper grounding or earthing system can cause several unwanted RF interferences (RFI) to television sets, broadcast receivers, hi-fi sets and telephone sets. In this Article the author explain how to setup a proper radio shack grounding using coaxial cable and ceramic disc capacitor
[ Hits: 1293 | Votes: 4 | Rating: 7.75 ]

Cost-effective ferrite chokes and baluns - In this article the author describes some new designs of ferrite loaded chokes for suppressing unwanted common mode currents at HF applied to feed lines like choke baluns, but also in the shack, applied to various coaxial, mains and data cables
[ Hits: 862 | Votes: 5 | Rating: 6 ]

Common-mode chokes Measurements - Common-mode chokes are useful solutions for RFI reduction. Winding a few turns of coaxial cable on the FT 240-31 toroid can reduced the noise below the received noise floor. In this article author measure different chokes
[ Hits: 156 | Votes: 1 | Rating: 8 ]