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• NVI 40 Meter Antenna Modeling - The idea of using a low mount dipole, enhanced with reflector wires directly beneath the dipole, on the ground, appears to be a very good approach to creating an NVI specific antenna for local HF operation.
  [ Hits: 3008 | Votes: 0 | Rating: 0 ]

• Trapped dipole for 80 and 40 m - This article explores a theoretical model for the losses of an 80m / 40m trapped inverted V dipole antenna system using a bootstrap coax trap, but does not examine the pattern of the antenna.
  [ Hits: 2731 | Votes: 0 | Rating: 0 ]

• The Guanella 1:4 balun - A cost effective current-mode 1:4 balun can be constructed from two lengths of coax, two ferrite rods, some electrical tape, cable ties, a length of PVC water-pipe and some connectors. This form of 1:4 current-mode balun is named after G. Guanella.
  [ Hits: 3636 | Votes: 1 | Rating: 10 ]

• Folding the Dipole - The half wave dipole antenna is a simple and practical antenna model that consists of a half wavelength long centre fed conductor.
  [ Hits: 2377 | Votes: 4 | Rating: 7.5 ]

• Axial-Mode Helical Antennas - Notes on Axial-Mode Helical Antennas in Amateur Service. Helix Basics, Modeling Issues, and Short Helical Antennas Over Perfect Ground
  [ Hits: 1651 | Votes: 0 | Rating: 0 ]
• The normal-mode helix antenna - A helix will work in the normal mode when the diameter and pitch of the helix is less than 0.1 Lambda
  [ Hits: 3054 | Votes: 7 | Rating: 5 ]

• Coax Traps from a Modeling Perspective - About Coax Traps, NC4FB examine the operation of coax traps through modeling.
  [ Hits: 677 | Votes: 1 | Rating: 5 ]

• TARA's all Seasons Contests - Digital modes contest rules by TARA. Offers the All Seasons contest Tournament. A new concept in contesting.
  [ Hits: 364 | Votes: 0 | Rating: 0 ]

• European PSK Club - The European PSK Club, or EPC for short, is an informal club of amateur radio operators dedicated to maintaining high levels of amateur radio communications on PSK modes. Its purpose is to promote activity and good operating practice on the PSK modes on all amateur bands
  [ Hits: 1088 | Votes: 1 | Rating: 10 ]

• The Ham Band - A music video describing the building of a modern contest station - it teaches you morse code at the same time! Musical styles change from French Musette to Viennese Walz to German Oompah and the musical key changes 25 times!
  [ Hits: 435 | Votes: 0 | Rating: 0 ]

• Micro908 Kit - A re-usable control & computing platform for antenna measurement, PSK31 digital modems, audio filtering, signal source & VFO, memory keyer by AMQRP
  [ Hits: 1570 | Votes: 1 | Rating: 10 ]

• Digital Modes used in Ham Radio - Article with waterfall pictures and samples of several digital modes like psk31, sstv packet pactor hellschreiber domino thor jt65 and more
  [ Hits: 1129 | Votes: 3 | Rating: 7.67 ]

• Sights and Sounds of Digital Signals - Preview the waterfall signature of various digital signals and listen to the sound of the digital modes. Learn about the bandwidth requirements and why a linear transmitter path is critical to successful and correct use of many modes on the amateur bands by W1HKJ
  [ Hits: 1044 | Votes: 3 | Rating: 6.67 ]

• Olivia, the Magic Digital Mode - Olivia MFSK digital communications are becoming popular in amateur radio because Olivia is one of the most robust methods of text keyboarding, that can perform superbly for long distance communications. Olivia frequencies, format and software
  [ Hits: 1932 | Votes: 8 | Rating: 8.38 ]

• G4ILO Stealth Amateur Radio - If you are a ham and live in a modern urban or suburban development, putting up a highly visible antenna may make it difficult to stay friends with your neighbours.
  [ Hits: 1563 | Votes: 2 | Rating: 10 ]

• YAESU FL-2100Z Amplifier Repairs - The FL-2100Z amplifier referenced in the following images is the 6-Band model covering 10m thru 160m (no WARC bands) and not the 9-Band version that included the WARC bands. Modifications, schematics and manual
  [ Hits: 3479 | Votes: 8 | Rating: 7.25 ]

• Yagi-logper - Yagi-logper is a linux GPL program to model a Yagi or Log-periodic antennas with horizontal cylindrical dipoles.
  [ Hits: 1686 | Votes: 3 | Rating: 7 ]

• cocoaModem - CocoaModem is an opensource MacOSX application which implements modems (modulator-demodulators) for RTTY PSK MFSK Hellschreiber CW SITOR HF-FAX provided by W7AY
  [ Hits: 3182 | Votes: 6 | Rating: 8.33 ]

• Fldigi - Fldigi Freeware Digital multi mode program for Linux, Free-BSD, MacOS X and MS Windows . Support CW and several digital modes like PSK31, MFSK, RTTY, Olivia, WeFax, Hell and others and is a fully multi platform application
  [ Hits: 17901 | Votes: 24 | Rating: 7.49 ]

• A LF power amplifier - A Low Frequency (LF) RF Power Amplifier by VK5BR it operates in a linear mode and can handle CW, AM and SSB.
  [ Hits: 3307 | Votes: 2 | Rating: 1.5 ]

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