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• 80M Vertical antenna with capacitance hat - Simple wire antenna cheap to make, using readily available materials, Low angle radiation, with rejection of high angle signals Wide bandwidth, with resonance at the 80M DX window (3.790-3.800 MHz); and Maximum height is 40 feet
  [ Hits: 25088 | Votes: 23 | Rating: 7.05 ]

• Handi-Tenna portable satellite antenna - Here is a high-performance hand-held beam antenna that is easy to build and guaranteed to improve your downlink from the LEO satellites over ANY rubber duck or mobile whip
  [ Hits: 13276 | Votes: 7 | Rating: 7.37 ]

• Antenna Height Theory - Antenna mounting height, the higher the better? Learn how radiation pattern change, and decide if you need an higher or a lower angle for your dx needs.
  [ Hits: 1877 | Votes: 5 | Rating: 7.2 ]

• W8ZR High-Power Antenna Tuner - This homebrew legal-limit antenna tuner is based on the famous "Ultimate Transmatch" introduced by the late Lew McCoy, W1ICP. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24).
  [ Hits: 11496 | Votes: 10 | Rating: 8.1 ]

• NCDXF/IARU Beacon Project - The NCDXF, in cooperation with the IARU, constructed and operates a worldwide network of high-frequency radio beacons on 14.100, 18.110, 21.150, 24.930, and 28.200 megaHertz. These beacons help both amateur and commercial high-frequency radio users assess the current condition of the ionosphere
  [ Hits: 1333 | Votes: 4 | Rating: 8.5 ]

• KVK Antenna Systems - The manufacturer of the NuBeam, Vipole, and the multi-band Quad-Folded-Dipole (or QFD for short) antenna. Also have a unique multiband vertical which can combine operation on multiple HF frequencies as well as provide high gain on 50, 144 and 438MHz in a single antenna.
  [ Hits: 3978 | Votes: 1 | Rating: 1 ]

• Austin Antenna - Austin Antenna employs leading-edge antenna technology in the production of the highest performance antennas currently available. Marine Antenna, Multi-band Mobile, Point-to-Point, Base Station, Wide-band Land Based, LPDA, Linear Omni, Triplexer, Scanner Antennas
  [ Hits: 4142 | Votes: 7 | Rating: 8.43 ]

• MicroSignals - MicroSignals produces a line of RF and IF signal processing components that offer high performance at an exceptional value. To achieve this MicroSignals began with an engineering team that possessed an excellent background in RF Transformer and Balun design.
  [ Hits: 791 | Votes: 1 | Rating: 7 ]

• Clover - Clover technical specifications, digital communications mode that conveys 8-bit digital data over narrow-band high-frequency radio.
  [ Hits: 930 | Votes: 1 | Rating: 10 ]
• Mt-63 technical description - The MT-63 modem, constructed around a high speed DSP processor, either in a dedicated external DSP unit like the Motorola EVM, or in PC software using the PC sound card, transmits 64 tones spaced 15.625 Hz apart, in the 1 kHz bandwidth.
  [ Hits: 632 | Votes: 0 | Rating: 0 ]
• Olivia - The Olivia transmission system is constructed of two layers: the lower, modulation layer is an (almost) classical Multi-Frequency Shift Keying (MFSK) and the higher layer is a Forward Error-Correcting (FEC) code based on Walsh functions.
  [ Hits: 1469 | Votes: 1 | Rating: 3 ]

• HF Antennas for restricted space - Arrl document about invisible antennas and indoor systems. It is important to consider that few compromise antennas are capable of delivering the performance one can expect from the full-size variety. But the patient and skillful operator can often do as well as some fellows who are equipped with high power and full-size antennas. The "cliff-dweller" may not be able to "bore a hole" in the band as often, and as easily, but DX can be worked successfully when band conditions are suitable.
  [ Hits: 9199 | Votes: 7 | Rating: 5.28 ]

• HF Radio wave propagation - Radiowave propagation in the medium and high frequency spectrum in DOC format
  [ Hits: 954 | Votes: 3 | Rating: 3.33 ]

• Eurocom-pro - High performance Software and Devices
  [ Hits: 479 | Votes: 0 | Rating: 0 ]

• Antenna elevator system for amateur satellites - Smart homebrew antenna-ELEVATOR system with linear actuator. The actuator is a cheap and heavy tool with high enough torque, ideal for elevation systems, but in practice it needs quite an effort in order to operate correctly in your homebrew antenna system. This page inform you of the actuator's secrets.
  [ Hits: 22321 | Votes: 44 | Rating: 7.66 ]

• AA5TB Antenna Coupler / SWR Bridge - Wire antennas requires a special coupling network to properly couple my 50 ohm coax to the antenna's high impedance (5000 ohms)
  [ Hits: 4750 | Votes: 2 | Rating: 9.5 ]

• Broadband news : Canadian BPL - Hydro-Québec joins efforts to provide high-speed internet service via power-lines
  [ Hits: 461 | Votes: 0 | Rating: 0 ]
• New Developments with PLC in Japan - The Japan Amateur Radio League (JARL) is cautiously watching new developments concerning the commercialization of Power Line Communications (PLC), while continuing to carry out joint experiments with a high speed power line communication promoters' alliance to reduce potential interference to radio communications.
  [ Hits: 370 | Votes: 1 | Rating: 1 ]
• Japan plays catch-up in high-speed plc - telecom asia
  [ Hits: 360 | Votes: 1 | Rating: 7 ]
• Are you ready for BPL - Broadband over power lines (BPL) is a technique for transmission of high speed data (broadband Internet) over powerlines. Access BPL technology injects radio frequency energy into powerlines which were not designed for transmission of radio frequency energy, and leak substantial energy that causes interference to radiocommunications service
  [ Hits: 672 | Votes: 0 | Rating: 0 ]

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