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788 links - and 17 categories

Antennas : 40M
  • W1UJ Moxon Project - A project for a Moxon antenna for 7 MHz with pictures and EZNEC model
    [ Hits: 604 | Votes: 0 | Rating: 0 ]
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 : Loop
  • Pennant Loop adventures - Experimenting with pennant loop antennas article by Jedd Smith, includes layout ideas, modeling and design along to some pictures
    [ Hits: 480 | Votes: 4 | Rating: 7 ]
Antennas : Moxon
  • 70cm Moxon Beam - A moxon antenna project for 70 cm band, test and results of this popular antenna model applies to UHF bands.
    [ Hits: 1731 | Votes: 9 | Rating: 6.34 ]
Antennas : Patch
  • The Basics of Patch Antennas - This article explores the basic concepts of patch antennas. Topics include principles of operation, impedance matching, radiation pattern, circular polarization, bandwidth, efficiency, alternative feed types, stacked patches and higher mode behavior.
    [ Hits: 803 | Votes: 1 | Rating: 9 ]
Antennas : Quad
  • 2 Meter 5 Element Quad - A five element quad antenna for 144 MHz DIY Project. This 2 Meter 5 Element Quad antenna was modeled using EZNEC, with a boom from a UHF TV antenna and CPVC pipe for spreaders. Constructed for 146MHz, it exhibits a gain of 10.7dB and an impedance of 75 ohms. Real-world results surpass the HT antenna, reaching over 20 repeaters up to 75 miles away. The design, costing around $10, employs simple tools for assembly.
    [ Hits: 1884 | Votes: 9 | Rating: 6.23 ]
DX Resources : Beacons
  • WSPR - weak signal beaconing - Introduction to WSPR beacons. Article describe WSPR2 and WSPR15 beaconing mode and include a frequency reference table for both WSPR modes
    [ Hits: 654 | Votes: 0 | Rating: 0 ]
DX Resources : Contest : SO2R
  • SO2R to increase operating time - Uderstanding Single Operator two radios amateur radio contesting mode, an article by CT1BOH
    [ Hits: 185 | Votes: 0 | Rating: 0 ]
Ham Radio : Band Plans
  • Considerate Operator's Frequency Guide - The Considerate Operator's Guide shows frequencies generally recognized for certain modes or activities (all frequencies are in MHz).
    [ Hits: 1372 | Votes: 1 | Rating: 2 ]
Operating Aids : History
  • Morse Key History - An overview of the development of the Morse key for sending the Morse Code, from the first camelback keys, through straight keys and sideswiper keys to the semi automatic keyers including the Vibroplex to the modern electronic keyer.
    [ Hits: 194 | Votes: 0 | Rating: 0 ]
Operating Modes : D-STAR
  • D-STAR User Guide for beginners - If you have just bought a new D-STAR radio, have read all the instruction, know how it works but are not too sure of what and how much you can do with your radio, this guide can help you understanding the basics of how to operate in D-STAR mode.
    [ Hits: 454 | Votes: 0 | Rating: 0 ]
Operating Modes : JT65
  • JT65-DX.com JT65-HF Japanese Edition - JT65 software download archive for all JT65 editions, includes a JT95 and JT9 operating mode informations, JT65 reference website for Japanese operators.
    [ Hits: 279 | Votes: 0 | Rating: 0 ]
  • JT65 ‐ HF Operation Guide - Get familiar with the basic operating procedures for using the JT65 mode of HF digital communications, a 35 pages PDF file.
    [ Hits: 870 | Votes: 0 | Rating: 0 ]
Operating Modes : Meteors
  • Meteor Scatter and WSJT - Working Meteor Scatter with WSJT in FSK441 mode a presentation describing WSJT usage in VHF bands
    [ Hits: 265 | Votes: 0 | Rating: 0 ]
Operating Modes : PSK31 Radio Equipment : HF Transceivers : Yaesu FT-817
  • FT-817 Interface - CAT and Digital modes interface for the Yaesu FT-817
    [ Hits: 772 | Votes: 1 | Rating: 1 ]
Radio Equipment : HF Transceivers : Yaesu FT-847
  • Homebrew Digimode Interface - A full galvanic isolation interface for digital modes tested with FT-847
    [ Hits: 1054 | Votes: 0 | Rating: 0 ]
Software : Digital SSTV
  • JMSK - JMSK is a software modem that implements a good coherent MSK demodulator that has performance comparable to BPSK. Signals are demodulated from the soundcard. Modulated signals can be routed through the soundcard or to an external device such as a DDS module for direct RF modulation. The advantage of MSK compared to PSK is that non linear amplifiers can be used and has a faster roll off. It is an open source cross-platform program written in C++ Qt.
    [ Hits: 369 | Votes: 2 | Rating: 5.5 ]
Technical Reference : Amplifiers : VHF Amplifiers
  • 80W all mode VHF amplifier - 80 watt multi-mode amplifier using one of the newer S-AV36 Toshiba modules. Less than 50 milliwatts will drive it to full output in any mode.
    [ Hits: 530 | Votes: 0 | Rating: 0 ]
Technical Reference : Mic wiring
  • Kenwood Mic Compatibility List - A reference matrix of Kenwood Microphones by models with connector specifications and transceiver compatibilty.
    [ Hits: 2648 | Votes: 8 | Rating: 3.5 ]

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