Feed Line

111 links - and 3 categories

160m Band Loaded Inverted L Antenna - This is a simple 160 meters antenna, a short loaded inverted L. The linear lenght is 20 meters, with the loading coil at 5 meters from the feedpoint.
[ Hits: 320 | Votes: 1 | Rating: 7 ]

Linear Loaded 40m Dipole - Dipole for 40m band. It is a simple linear loaded dipole feeded with 450-Ohm openwire feedline. Designed it for resonance at 7.050 MHz, can be tuned on 30m and 80m bands with an external antenna tuner. Build with simple electrical copper wire (2.5 mmq/13 awg) and two fishing poles with size of about 7 m/23 ft.
[ Hits: 161 | Votes: 0 | Rating: 0 ]

The Ugly MacGyver 6 meter J-pole Antenna - Essentially, a J-pole is a 1/2 wave resonant antenna connected to a quarter wave matching stub. The feedline is connected at a point on the matching stub that is at the feedline's characteristic impedance. The result is 3/4 of a wavelength on one side and 1/4 wavelength on the other side.
[ Hits: 202 | Votes: 0 | Rating: 0 ]

Common Mode Currents on Coax - These baluns are used to attenuate the common mode current that flows on the outside of the coaxial feed line.
[ Hits: 176 | Votes: 0 | Rating: 0 ]
Unun vs Balun - Configurations and differences - If you ever asked if you need an Unun or a Balun this article is for you. The right question should be do I need a feed line choke or an impedance transformer whose output is configured as balanced or as unbalanced. An impedance transformer can be configured as a voltage transformer or as a current transformer.
[ Hits: 345 | Votes: 3 | Rating: 6.67 ]

Beverage Receive Antenna - The Beverage we use is a DX Engineering RPS-1 dual directional 360 foot 109,7 m, oriented due North/South, six feet 1,8 m off the ground. The antenna uses 450 ohm ladder line as the antenna, and 75 ohm RG-6u for the feedline. The antenna runs atop the fence between our property and 5 acres of pasture next door.
[ Hits: 151 | Votes: 4 | Rating: 7.25 ]

Speaker Wire Doublet Antenna - A portable wire antenna for the HF bands, made with a common speaker wire. In its natural form, the speaker wire acts as parallel feed line coming up to the bottom of the PVC feed point. From there, it's split into two wires, one heading out each side of the PVC tee.
[ Hits: 394 | Votes: 4 | Rating: 9 ]
The Story of the Broadband Dipole - A dipole can be broadbanded by a number of techniques including by matching with resonant sections of transmission feed lines.
[ Hits: 410 | Votes: 0 | Rating: 0 ]

To transform ot not to transform - Feed Lines - Transmission lines have many uses other than simply transferring RF power from one point to another. Impedance matching, baluns and filters are probable the most common of these.
[ Hits: 137 | Votes: 0 | Rating: 0 ]

Helical Antennas -Theory - Helical antenna or helix antenna is the antenna in which the conducting wire is wound in helical shape and connected to the ground plate with a feeder line. It is the simplest antenna, which provides circularly polarized waves.
[ Hits: 137 | Votes: 0 | Rating: 0 ]

J-pole antenna Calculator - Online calculator for J-Pole antennas. The J-pole antenna consists of a short and a long vertical pole with a feed point near the bottom. The antenna looks like the letter J, hence the name J-pole antenna.
[ Hits: 417 | Votes: 0 | Rating: 0 ]
Exploring The J-Pole Antenna - The J-Pole antenna is a common omnidirectional antenna used in amateur radio, particularly on the VHF and UHF bands. This article is an attempt to explore how the J-pole antenna transforms feed-line impedance to free-space impedance, all the while providing gain found only in the more expensive commercial products.
[ Hits: 143 | Votes: 0 | Rating: 0 ]

Quad Loop Antenna for 50 MHz - Building A Full-Wave Quad Loop Antenna for 6 Meters. This is an easy antenna to build and the materials cost about $15-20. It exhibits 1.8dB gain over a 1/2-wave dipole. Using an open-wire parallel feedline (commonly called ladder line) with an antenna tuner, it tunes up on the 10m band as a 5/8-wave loop as well
[ Hits: 199 | Votes: 1 | Rating: 1 ]

Practical Antenna Modeling with 4NEC2 - Presentation about Practical Antenna Modeling Using the NEC Codes with examples of HF wire antennas and 4NEC2. How to define and edit the models, Running the simulations, Work some examples, Variables usage, Deal with Feed Lines and ground
[ Hits: 479 | Votes: 0 | Rating: 0 ]

HyEnd Company - HyEnd is a dutch amateur radio antenna manufacturer. Makers of the popular HyEndFeed Antennas, produce Baluns, bandpass filters and selle Line isolators, coax cables and connectors.
[ Hits: 197 | Votes: 0 | Rating: 0 ]

County-Hunting Mapper - A unique, easy-to-use Amateur Radio program for creating County, State, Section and Grid Locator outline maps of North America that can be filled by Hand, from a Contest Logger UDP Feed, or from Imported ADIF or Cabrillo Logs.
[ Hits: 127 | Votes: 0 | Rating: 0 ]

Velocity Factor of Coax Cables - Undertanding the velocity factor in coax cable feed lines. Meaning of the veolcity factor index related to the RF speed of a signal inside the coax cable.
[ Hits: 168 | Votes: 2 | Rating: 10 ]
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: 251 | Votes: 2 | Rating: 5 ]

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: 861 | Votes: 5 | Rating: 6 ]

SWR and Amateur Radio Antenna Tuners - Undestanding and measuring SWR, Standing Wave Ratio in antenna feed lines. This article also introduce basic concepts and usage guidelines of amateur radio antenna tuners
[ Hits: 219 | Votes: 2 | Rating: 9.5 ]