rf coil

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Antennas : Baluns

  • Coiled Choke Balun for HF - A very practical Balun for HF aerial work is the choke type. It reduces RFI to and from the feeder & at next to no cost or loss.
    [ Hits: 1913 | Votes: 1 | Rating: 8.00 ]
Antennas : Coils
  • Antenna Matching Coil Adjustment Procedure - Without this basic knowledge, addressing antenna problems, RFI problems, and matching problems, results in a frustrating situation. Procedure which must be followed to properly adjust a shunt matching coil.
    [ Hits: 2143 | Votes: 3 | Rating: 2.00 ]
  • 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: 376 | Votes: 2 | Rating: 4.50 ]
Antennas : Spiral
  • Petlowany Antennas by K6NO - WorldRadio Article on Petlowany antennas base on this principle: if a length of wire is wound into a spiral-shaped coil and excited by a radio frequency current connected to the innermost portion of the coil, it will then, and only then, exhibit RF characteristics that closely approximate those of a resonant linear wire of the same length
    [ Hits: 2991 | Votes: 8 | Rating: 6.75 ]
Manufacturers : Antenna Parts
  • CWS Coil Winding Specialist - Manufacturer of transformers, inductors coils and chokes. Custom winding, EMI / RFI Filters, Antenna Windings on ferrite rod, Antenna Winding on phenolic. Any antenna coil designs.
    [ Hits: 367 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Electronic Components
  • BG Micro - All kind of electronic components, Hobby Electronics and Parts, motors, Sun power solar panels, switches, rechargeable batteries, RF Coils, Coils and Chokes
    [ Hits: 554 | Votes: 0 | Rating: 0.00 ]
  • Communication Coil - Communication Coil, Inc. designs and produces custom, high reliability Filter Networks, RF Coils, Chokes, Inductors, Baluns, Toroids and Power Magnetics for communications
    [ Hits: 592 | Votes: 0 | Rating: 0.00 ]
Software : Antenna analysis
  • TANT 136 - DOS program for calculating the performance of a T antenna. Gives loading coil info and matching plus ERP by Reg G4FGQ
    [ Hits: 354 | Votes: 2 | Rating: 2.50 ]
Software : Circuit Design
  • HeliCoil - Inductance calculation for single layer, air-wounded coils and helixes up to about 800 MHz. Inductance calculations accuracy is around 1%. Also, coils with maximum Q for given inductance, resonant RF chokes, PI and T resistive attenuators calculations are provided. Skin effects, radiation losses and other minor side effects are not accounted in maksimum Q factor coils calculations. Program assumes using copper (Cu) enameled or silver (Ag) plated wire. Program is writen bilingual in English and Serbian by YU1AW
    [ Hits: 1794 | Votes: 8 | Rating: 4.88 ]
  • Coil Inductance Calculator - Approximate Air Coil Inductance Calculator
    [ Hits: 1972 | Votes: 8 | Rating: 4.37 ]
Technical Reference : Receivers
  • A 80/40m Direct Conversion HF Receiver with DDS VFO - Juha (OH2NLT) and Matti (OH7SV) have designed JUMA-RX1, an award winning 80/40m direct conversion HF receiver with highly accurate direct digital synthesis VFO. The receiver is very compact, because it constructed using surface mount components. No coils need to be wound to construct this receiver!
    [ Hits: 5718 | Votes: 14 | Rating: 7.79 ]
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