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Antennas : 40M

  • A Feasible Full Sized 40 Meter Beam - This project started as a result of renewed interest in 40 meters coupled with the desire for an antenna system that would be more effective than the simple dipole.
    [ Hits: 7238 | Votes: 1 | Rating: 1 ]
Antennas : Four Square
  • Receive 4 square antenna - N6RK receive 4 square antenna with transformer coupled antennas and true hibrid combiner
    [ Hits: 1678 | Votes: 1 | Rating: 7 ]
Antennas : J-Pole
  • Tri-Band J-Pole - This strange looking antenna is a combination of Coupled-Resonator principle by K9AY and a quarter stubs to achieve low angle radiation pattern. Designed with 4nec2 NEC based antenna modeler and optimizer for 145/220/440MHz bands
    [ Hits: 1913 | Votes: 5 | Rating: 9 ]
Antennas : Satellite
  • EggBeater Antenna for VHF UHF - This antenna was conceived mainly for high-speed digital transmission via satellite. The antenna is made of two full waves loops , mounted at right angles to each other. Then coupled together, 90 degrees out of phase over a horizontal circular reflector. With this configuration the antenna is omni directional and circularly polarized.
    [ Hits: 226 | Votes: 0 | Rating: 0 ]
Antennas : T2FD
  • T2FD Antenna - Terminated and twisted folded dipole - T2FD is a 600-900 ohms folded dipole, terminated with resistor. Feed impedance is coupled with 50/600 ohms voltage balun. It is a wide band antenna with rather low SWR over the full designed frequency range: antenna tuner is seldom needed.
    [ Hits: 482 | Votes: 0 | Rating: 0 ]
Antennas : Theory
  • Link-Coupled Antenna Tuners - W4RNL tutorial on on inductively coupled (link-coupled) antenna tuners
    [ Hits: 2679 | Votes: 2 | Rating: 5.5 ]
Antennas : Tuners
  • Link Coupled Tuner - Legal Limit Link Coupled Balanced Tuner,for the amateur ham radio HF bands. This Tuner uses plug-in Coils sets for 40, 80, & 160 meters
    [ Hits: 3909 | Votes: 2 | Rating: 7 ]
  • Z-Match Antenna Tuner project - This Z-Match is a link coupled all-band tuner. Two all band tank circuits cover 3-14mhz and 14-30mhz. The tank output links are selected with a very heavy duty SPDT rotary switch.
    [ Hits: 1173 | Votes: 0 | Rating: 0 ]
  • QRP Z-Match Tuner 40-10m - The Z Match is really a basic L Match consisting of a series capcitor and variable shunt inductor, coupled to the antenna using the RF transformer action.
    [ Hits: 1797 | Votes: 0 | Rating: 0 ]
Manufacturers : Test Equipment : Signal generator
  • Signal Forge - The signal forge 1000 signal generator is a portable, high-performance digital and rf signal source with a 1 ghz frequency range. features include digital, differential and ac coupled outputs
    [ Hits: 635 | Votes: 0 | Rating: 0 ]
Software : Filter Design
  • AADE Filter Design - Dowwnload this free windows programs to design Butterworth, Chebyshev, Elliptic (Caur), Bessel, Legendre and Linear Phase low-pass, high-pass, band-Pass, and band-reject filters. Coupled Resonator band-pass filters
    [ Hits: 24825 | Votes: 113 | Rating: 7.16 ]
Technical Reference : Amplifiers : UHF Amplifiers
  • A 1296MHz Amplifier - Two coupled PAs with each 2 times 2C39 deliver around 400W RF.
    [ Hits: 776 | Votes: 0 | Rating: 0 ]
Technical Reference : Sound Card Radio Interfacing
  • Optocoupled Transceiver-PC Audio Isolator project - An optocoupled audio interface between PC and Transceiver for digital modes. The article includes full schematic of complete board and build instructions.
    [ Hits: 197 | Votes: 0 | Rating: 0 ]

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