capacitors

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capacitors

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Antennas : End-Fed : End Fed Half Wave Antenna
  • The End-Fed Half-Wave Antenna - Presentation - A very well done presentation about End-Fed Half-Wave antennas. This PDF document contains a summary of experiences in how to build custom EFHW antennas. Includes an interesting comparison table of UnUn configurations with recommended toroids, Wire size, turns and capacitors. An useful recap on common errors in building homebrew EFHW Ununs completes the document.
    [ Hits: 406 | Votes: 3 | Rating: 8.67 ]
  • 40m QRO End Fed Half Wave Antenna Coupler - A medium power End Fed Half Wave Antenna coupler, specifically tuned to the QRP frequency of 7030 kHz. Constructed from coil stock and capacitors, it achieves an impedance ratio of 64:1. The coupler has proven effective for power ranges from 2 to 100 Watts on the 40m band.
    [ Hits: 102 | Votes: 0 | Rating: 0 ]
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 ]
  • Z Match with Toroid - A single coil Z-Match. This QRP version by G3WQW, using a T130-2 toroidal inductor and polyvaricon variable capacitors was published in Sprat 84.
    [ Hits: 98 | Votes: 0 | Rating: 0 ]
Manufacturers : Antenna Tuners
  • HA8DU Antenna Tuners - HA8DU European manufacturer of quality amateur radio antenna tuners for HF Bands, from 10 meter to 160 meters band. Products includes manual and automatic antenna tuners, power handling till 3.5 KW. HA8DU produce even custom made variable capacitors and rotary switches.
    [ Hits: 396 | Votes: 4 | Rating: 7.5 ]
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 : Electronic Components
  • Otto Schubert GmbH - Electronic components distributor based in Gemany offer a variety of variable capacitors and other hard-to-find components.
    [ Hits: 336 | Votes: 0 | Rating: 0 ]
  • Baitron Electronics Company Limited - Electronic Components Distributor - Online shop for electronic components, sensors, connectors, capacitors, resistors, passives, semiconductors from Baitron independent electronic components distributor.
    [ Hits: 243 | 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 ]
Technical Reference : Calculators
  • Capacitance Calculator - An online calculator for designing and evaluating capacitors based on the capacitor's area, separation, number, and dielectric constant
    [ Hits: 254 | Votes: 0 | Rating: 0 ]
Technical Reference : Components
  • Homemade capacitors - A gallery of home made capacitors made with ALU clamping plates and teflon insultators
    [ Hits: 169 | Votes: 2 | Rating: 5 ]
  • Repair or Replace Electrolytic Capacitors - For low voltage applications, like cathode bypass capacitors, most vintage types have an axial configuration, which is less common today but still available. Electrolytic power supply caps likely constitute the single worst liability in old audio, radio and test equipment. Rap about Electrolytics, Reforming, Chassis-Mount Replacements, Under-Chassis Installation, Rebuilding Capacitors
    [ Hits: 120 | Votes: 1 | Rating: 6 ]
Technical Reference : Electronics
  • KAM Repairing - Repairing a KAM interface changing two capacitors and transistors by IK5PWC
    [ Hits: 197 | Votes: 1 | Rating: 7 ]
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 ]
Technical Reference : Radio Frequency Interference
  • Behringer HA400 Headphone Amplifier and RFI - Removing disturbing RFI from the Behringer HA400 Headphone Amplifier, using ferrites and capacitors soldered in the main circuit board of the small amplifier.
    [ Hits: 121 | Votes: 2 | Rating: 5.5 ]

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