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• Is this ewe for you - A really simple receiving antenna for 80 and 160 meter dxing by WA2WVL
  [ Hits: 4117 | Votes: 4 | Rating: 4.5 ]

• Using the half-square antenna for low bands - Can’t put up a really high horizontal antenna for 80-meter DXing? Maybe the vertically polarized Half-Square might be the antenna for you.
  [ Hits: 3210 | Votes: 3 | Rating: 6.33 ]

• Balun measuements - Why can't you find the specifications for the baluns on the market? The only specifications you'll see are the ratio, the power rating and a bandwidth that is more hoped for than reality.
  [ Hits: 2631 | Votes: 3 | Rating: 4 ]

• Balun single core 4:1 analysis - Real 4:1 Transmission Line Balun with Balanced Load
  [ Hits: 6161 | Votes: 1 | Rating: 10 ]

• G5RV antenna - Review by G3TXQ and comparison to its modificated versions. SWR Measurements on inverted V setup and comparison from EZNEC model and a real one.
  [ Hits: 1843 | Votes: 3 | Rating: 4 ]

• 13 cm Helix Antenna  ^pop - Here is the design of a 2.4 GHz antenna that is ideal for amateur satellite communications. This antenna is easy to assemble because the design itself tolerates inaccuracies in the construction without really affecting performance.
  [ Hits: 65539 | Votes: 90 | Rating: 6.04 ]

• Mounting elements to a boom - Here is an easy method to mount elements to a boom, this can be realized at home, without the need of special tools
  [ Hits: 2153 | Votes: 3 | Rating: 5.67 ]

• A Horn Antenna for 2.4 GHz. - This Antenna is not really practical for AO-40 reception, but horn antennas have a number of qualities useful in microwave antenna testing and noise figure measurements.
  [ Hits: 10958 | Votes: 32 | Rating: 3.82 ]

• DK7ZB 144 mhz Yagis - High gain, good pattern and acceptable bandwidth. These aims can be realized with a radiation-resistance of 25-35Ohms, because the 28-Ohm-feedpoint is very simple to match.
  [ Hits: 1908 | Votes: 7 | Rating: 6.86 ]

• ZS6BKW variant of the G5RV - The ZS6BKW variant of the G5RV claims to offer multi-band coverage without the need for a tuner. This article looks at whether or not these claims are valid in a real life installation.
  [ Hits: 7997 | Votes: 12 | Rating: 7.75 ]

• Tubes 201 - How Vacuum Tubes Really Work
  [ Hits: 1347 | Votes: 2 | Rating: 9 ]

• Near-Real-Time F2-Layer Critical Frequency Map - This map can be used to determine the frequencies that will always be returned to the Earth. Transmitted frequencies higher than the indicated contours (which are given in MHz) may penetrate the ionosphere, resulting in lost power to space. The map shows the radio auroral zones as green bands near the northern and southern poles.
  [ Hits: 5270 | Votes: 24 | Rating: 4.84 ]

• SEC's Radio User's Page - Provide radio operators with current data on the state of the ionosphere. Real-time Displays, Recent Space Environment Reports, Ionospheric Data Sets, Summaries & Medium Range Forecasts
  [ Hits: 1097 | Votes: 1 | Rating: 10 ]

• IPS - HF Systems MUF maps and prediction charts - These pages provide general propagation advice for HF communicators. Information available includes inferred global propagation conditions, real time HF fadeout coverage charts, regional ionospheric vertical MUF maps and Hourly Area Prediction charts for Astralia and Asia, Europe and North America
  [ Hits: 4956 | Votes: 17 | Rating: 5.83 ]

• Yagi Modeler Applet - This java applet/application implements a simple yagi modeling code. The initial input is a really trivial 2 elmenent yagi.
  [ Hits: 2917 | Votes: 31 | Rating: 6.16 ]
• Tower - Windows program for analyzing vertical antennas. This program shows the resistance and reactance to be expected looking into a cylindrical metallic tower over a perfect ground. It gives a useful approximation of the values to be expected in a real-world situation.
  [ Hits: 1347 | Votes: 1 | Rating: 10 ]

• FreqTweak - FreqTweak is a tool for FFT-based realtime audio spectral manipulation and display for Linux. It provides several algorithms for processing audio data in the frequency domain and a highly interactive GUI to manipulate the associated filters for each. It also provides high-resolution spectral displays in the form of scrolling-raster spectrograms and energy vs frequency plots displaying both pre- and post-processed spectra.
  [ Hits: 1392 | Votes: 3 | Rating: 9 ]

• Soundcard Audio Tools and Toys - Soundcard audio tools and toys, experimental ideas and utilities. Signal Generator, Frequency-counter / instrument-tuner, Real-time Spectrum Analyser
  [ Hits: 14613 | Votes: 16 | Rating: 7.75 ]

• SDR - Software Defined Radio Projects - An updated and classified collection of SDR projects and realizations
  [ Hits: 8235 | Votes: 12 | Rating: 6.75 ]

• High Voltage Breakdown Tester - K8CU technical topics article about high voltage breakdown tester necessary for testing of any high voltage components like vacuum tubes, high voltage capacitors, vacuum relay
  [ Hits: 537 | Votes: 4 | Rating: 7.75 ]

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