ac coil

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ac coil

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Antennas : 40M : 40 meter Dipole Antennas
  • 40m loaded dipole - This is an short dipole for 7 MHz. Total length of this dipole is just 10 meters, 33 feet. Missing lenght is balanced by a coil made of 49 turns of a 40mm diameter pvc pipe. The use of a choke balun is recommended, as always, to adapt the unbalanced coax cable to the balanced antenna, and to prevent RF feed back along the coax shield.
    [ Hits: 192 | Votes: 4 | Rating: 8.75 ]
  • Make a Compatct Dipole for 7 MHz - This article demonstrate how to build and mount a 40 meter loaded dipole using basic materials. This antenna reduce the overall length of an HF dipole through the use of loading coils.
    [ Hits: 215 | Votes: 0 | Rating: 0 ]
Antennas : 40M : 40 meter Vertical Antennas
  • A very efficient half size 40 meter Vertical Antenna - A vertical antenna project for the 7MHz made with some spare parts. Based on a broken 20 foot fishing pole, it is based on a good ground system made with radials and a capacitive hat done to increase the global radiation resistance of the antenna. A custom loading coil is also included in this project to perfectly tune the antenna to the CW portion of the 40 meters band.
    [ Hits: 735 | Votes: 4 | Rating: 8.5 ]
Antennas : 80M
  • 80m Shortened Dipole Antenna - This antenna just requires about 24m of free space instead of 41m that a normal half wave 80m antenna needs to hang up. The so called loaded dipole uses a coil in every dipole arm to electrically lengthen the mechanical too short dipole arms. Every coil has an inductivity of 120 microHenry.
    [ Hits: 152 | Votes: 0 | Rating: 0 ]
Antennas : Antenna Calculators
  • Coil-Shortened Dipole Antenna Calculator - Build an effective dipole antenna that needs much less space by adding two loading coils. This online calculator tells you how.
    [ Hits: 1247 | Votes: 9 | Rating: 6.34 ]
  • Coil-Shortened Vertical Antenna Calculator - You can shorten a vertical antenna by using a loading coil. This online calculator tells you how the amout of inductance your loading coil will need to have.
    [ Hits: 309 | Votes: 2 | Rating: 5.5 ]
Antennas : Coils
  • RF Choke Coil - Made Easy - In this article K3DAV show a very simple way to make an RF choke coil that will remove your RF feedback troubles
    [ Hits: 1260 | Votes: 6 | Rating: 5.83 ]
Antennas : J-Pole
  • Improving Gain of the Super J-Pole Antenna - The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole. there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. Get 0.8 dB more gain out of the trusty Super-J by replacing the traditional phasing stub with a long coil.
    [ Hits: 189 | Votes: 0 | Rating: 0 ]
Antennas : Multiband
  • Short Multiband Dipole Array - A multiband shortened fan dipole. This page offers and online calculator that can be really useful if you plan to homebrew a multiband dipole for low HF bands and you don't have all needed space for the full lenght. It combines multiband dipole with loading coild for selected bands.
    [ Hits: 229 | Votes: 0 | Rating: 0 ]
Antennas : Portable
  • Build the PAC-12 Antenna - A multi-band portable vertical antenna can be built with relatively ordinary components obtained from the local hardware store, including replaceable loading coils
    [ Hits: 1034 | Votes: 2 | Rating: 6.5 ]
  • PAC-12 Antenna modification - A Multiband Slinky Coil for the PAC-12 portable Antenna, can be used also as a dual PAC-12 dipole by James Bennett
    [ Hits: 264 | Votes: 2 | Rating: 10 ]
Antennas : Tuners
  • The Z Match Using a Toroidal Core Coil - Combined with Miniature Tuning Gang Capacitors, a toroidal core inductor is a means to assemble a compact Z Match assembly for Low Power (QRP) use.
    [ Hits: 608 | Votes: 0 | Rating: 0 ]
Manufacturers : Antenna Parts
  • Wolf River Coil - Vertical Base Replacement Coil. Wolf River Coil build quality antenna coils that are easy to tune and easy to install.
    [ Hits: 165 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Transceivers : Yaesu FT-817
  • The FT-817 Calibration Menu - One of the interesting features of the FT-817 is that many of the conventional calibration settings that would have, in the past, been done using manual adjustments of coils, capacitors, and potentiometers, are done via software.
    [ Hits: 128 | Votes: 0 | Rating: 0 ]
Shopping and Services : Kits and Components
  • Hamtech - HAM-made engineering products supplies and produces coaxial relays, antenna switches, sequencers, roller inductors, variable capacitors, low noise preamplifiers, RF power rotary switches and coil bodies.
    [ Hits: 191 | Votes: 0 | Rating: 0 ]
Software : Circuit Design
  • Coil Inductance and Q Calculator - Calculates inductance and Q for single-layer coils made of solid or Litz wire. Uses U.S. or metric dimensions. Can automatically maximize Q. Includes accuracy data. Runs in Windows.
    [ Hits: 255 | Votes: 0 | Rating: 0 ]
  • Online Helical Coil Calculator - This online calculator will give as output the Inductance L of a coil, including the total lenght of the wire needed to wound the coil. As input, requires the Diameter, number of turns, wire diameter and turn spacing
    [ Hits: 341 | Votes: 7 | Rating: 5.71 ]
  • Online Coil Inductance Calculator - This online calculator will return the inductance of a coil. It will ask you the total number of turns, the total diameter of the coil and its lenght, from the first winding to the last. Obtaining the correct inductance in winding a coil can be easy if you already know how many turns are needed. Available in inched and centimeters,
    [ Hits: 104 | Votes: 0 | Rating: 0 ]
Technical Reference : Coax Cables and Connectors
  • Ecoflex-15 Degradation - This article describes the problem detection on power loss events experienced during repeated usage of the Ecoflex-15 coax cable by members of the G3PYE contest minions and addressed to repeated coiling and uncoiling which has fractured the foil braid in numerous places.
    [ Hits: 175 | Votes: 0 | Rating: 0 ]
Technical Reference : Filters
  • A home-built low-pass filter for 4m - This unit uses four capacitors, only two of which are variables, and a single tapped coil. It is built in a die-cast box, and has been tested up to 80W input power on 70MHz by G4CJZ
    [ Hits: 588 | Votes: 0 | Rating: 0 ]

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