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• 2m Quad Turnstile Antenna - The loops are made of 10 mm round aluminum tube. No bending pliers was used to gently bend 90 degrees to obtain a square with 53 cm inner sides. Each loop has an impedance of approximately 100 Ohm. To connect both radiators in phase, a quarter wave long feeder of 100 Ohm is required.
  [ Hits: 207 | Votes: 0 | Rating: 0 ]

• Six Meter Quad Turnstile Antenna - Simple 6 Metre DX Antenna based on an article by LB Cebick in QST May 2002 on a Quad Turnstile antenna. This antenna is basically two full wave loops mounted at right angles fed 90 degrees out of phase to produce an omni-directional horizontally polarized pattern
  [ Hits: 702 | Votes: 2 | Rating: 9.5 ]

• Convert 40m 2-element to a Phased Drive Array - This presentation details the work of converting a 40m 2-element reversible beam antenna into a phase-driven type of array
  [ Hits: 877 | Votes: 1 | Rating: 2 ]

• A Reversible Beverage at ZL3IX - How do two-wire reversible direction Beverages work, an excellent document that explains fundamentals of beverage antennas. This article details the design and performance of a reversible beverage antenna. Leveraging orthogonality between common mode and differential mode currents on a 2-wire line, this antenna facilitates independent reception from both ends. While common mode signals arrive and are summed on a transformer's secondary for common mode reception, differential mode signals induce anti-phase currents, providing individual reception. Various measurements explore impedance, transmission loss, and F/B ratio, highlighting the antenna's effectiveness and areas for improvement. Notably, increasing the antenna's height significantly improved performance.
  [ Hits: 520 | Votes: 0 | Rating: 0 ]

• Double Half-Delta Loop RX Antenna - This wire antenna was developed to offer for a small, low-band, ground independent directional receiving antenna, it requires only two support poles. It is basically composed by two interconnected half delta loops and is better than a single flag or EWE, and almost as good as two phased EWE in the same space.
  [ Hits: 939 | Votes: 0 | Rating: 0 ]
• Receiving Phased Array with Small Electric or Magnetic Active Wideband Elements - Wideband receiving phased arrays with small electric or magnetic active wideband elements are discussed in details. Practical results and examples are given.
  [ Hits: 548 | Votes: 0 | Rating: 0 ]

• Phasing of two identical antennas - Phased Spaced Active Whips and Broadband Loops by WA1ION
  [ Hits: 401 | Votes: 1 | Rating: 2 ]

• Two Element Phased Verticals - Two 40 meter phased vertical antennas, project, pictures and description by W4NFR
  [ Hits: 1156 | Votes: 2 | Rating: 6 ]

• Lazy H Array Antenna for 40 meter - Make them simple then Make them work. The LAZY H antenna is a general type of antenna that is in the curtain array family. By placing two 1 wavelength dipoles in a plane that is at right angles to the direction of maximum radiation and keeping the proper in-phase current condition to each element, you can achieve a high gain bi-directional antenna.
  [ Hits: 284 | Votes: 3 | Rating: 5.33 ]

• W8JK Beam Antenna - The W8JK is a famous and effective DX antenna, first built by John Kraus, W8JK, in 1937. A Beam antenna with two parallel dipoles driven with opposite phase, with a close spacing of an eighth of a wavelength.
  [ Hits: 5151 | Votes: 21 | Rating: 7.19 ]

• K8UR Phased Array Switchbox - A Phased Array Switchbox by ComTek founder K8UR, switch your 4-Square in 8 directions and control it remotely over the internet
  [ Hits: 318 | Votes: 2 | Rating: 5.5 ]

• Valon Technology - Valon Technology designs and manufacturers low cost, reliable radio frequency products such as RF Synthesizer modules, RF Frequency Dividers and Phase Gain Detectors. Main markets are military/defense, test engineering, radio astronomy, research centers and universities
  [ Hits: 288 | Votes: 0 | Rating: 0 ]

• Silphase Technologies - Amateur radio SDR Receiver and Transceiver manufacturer , makers of the Silphase R1 an innovative HF receiver with high performance real-time spectrum scope.
  [ Hits: 132 | Votes: 0 | Rating: 0 ]

• SG8 RF Signal Generator 8 GHz - SG8 RF Signal Generator 10 MHz - 8 GHz, up to +28 dBm, phase noise -120 dBc/Hz @ 10 kHz offset from 1 GHz
  [ Hits: 377 | Votes: 2 | Rating: 1 ]

• ICOM IC-7851 vs IC-7800 - Icom IC-7851/7800 LO C/N Characteristics Comparison
  [ Hits: 244 | Votes: 0 | Rating: 0 ]

• The MonoGap Antenna for 30m Reviewed - A review of the 30 meter MonoGap Antenna. This review covers from the unboxing go the Gap product, the assembly of the elements, the test and tuning phase and a performance report during the years
  [ Hits: 241 | Votes: 1 | Rating: 10 ]

• Radius Power - DC Filters - DC filters from radius power are specifically optimized for applications with DC supply like e.g. photovoltaic inverters. Radius Power provides total power solutions, EMI filters solutions from design to manufacturing, Three Phase, Single Phase, Power Line, IEC inlet, Power entry modules Filters.
  [ Hits: 280 | Votes: 2 | Rating: 8 ]

• Digital Speech Decoder - An open source software decode various xMBE based modes. It support decoding QPSK, C4FM modes such as P25 Phase 2 (TDMA), MotoTRBO, NexEDGE, ProVoice and others more.
  [ Hits: 4303 | Votes: 48 | Rating: 5.44 ]

• How to locate RFI - I have RFI, now what– Locating it. This article is the first of a three parts article, that covers the problem of locating the RFI source. Author make use of an SDR receiver to locate RFI emissions. Ai interesting RFI location process diagrams helps on following the various phases, permitting the discovery of almost 75% of the RFI issues.
  [ Hits: 195 | Votes: 2 | Rating: 10 ]

• Noise cancellation on 2m using 2 antennas - Article on Phase-cancellation of noise on 2m band
  [ Hits: 503 | Votes: 2 | Rating: 3 ]

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