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Antennas : 160M
  • 160 meter antenna problems and solutions - The quarter-wave Marconi working against ground is a popular and inexpensive antenna for 160 meters. A lot of newcomers to the band favor this simple antenna because it's easy to put up, it isn't too big, and it works.
    [ Hits: 107 | Votes: 0 | Rating: 0 ]
Antennas : 20M : 20 meter Dipole Antennas
  • 20 meter short loaded vertical antennas - Loading is a way to lower the resonant frequency of an antenna radiator. This technique is typically used in antennas that have radiating elements that are too short for the desired resonance frequency. In this excellent article the author experiment loaded vertical dipoles for 20 meters band
    [ Hits: 231 | Votes: 1 | Rating: 9 ]
Antennas : 2M
  • An 8x2 Element Array Antenna For 144 MHz - This stacking offers a well known simple phasing technique. All elements can be fed in parallel by open wires provided that they are fed in phase. This can be achieved by twisting the open wire phasing-lines at 180 degrees.
    [ Hits: 164 | Votes: 0 | Rating: 0 ]
Antennas : 6M : 6 meter J-Pole Antenna
  • 50MHz / 6m J-pole Antenna by VK4ADC - The J-Pole is an easy-to-build and inexpensive device that provides an omni-directional vertically polarized antenna without the need for a ground plane. In technical terms, it is an end fed vertical 1/2 wave which is fed via a 1/4 wave matching stub.
    [ Hits: 438 | Votes: 4 | Rating: 6 ]
  • Home Built six meter J-Pole Antenna - This article provides details on building a 6 Meter J-Pole antenna using PVC pipe for an enclosure. This antenna uses flat 450 ohm Window Line for the tuning stub.
    [ Hits: 225 | Votes: 1 | Rating: 9 ]
  • Home Built 6M J-Pole Antenna - This article provides details on building a 6 Meter J-Pole antenna using PVC pipe for an enclosure.
    [ Hits: 167 | Votes: 0 | Rating: 0 ]
Antennas : Feed Lines : Choke
  • Patented RF choke test - A reproduction test of a a binocular ferrite core and winds a total of 7 turns is a patented rf choke with an unusual winding, although this winding scheme reduces the inductance, it might result in a much larger bandwidth over which the choke has a sufficiently large impedance. The Author test this model by reproducing the choke.
    [ Hits: 105 | Votes: 0 | Rating: 0 ]
Antennas : Receiving
  • 9 Circle RX antenna - The receiving antenna setup for the top band, made with a 9 elements vertical antenna array, remote controller and remote relais.
    [ Hits: 435 | Votes: 0 | Rating: 0 ]
Antennas : Satellite
  • Homemade Satellite Yagi - In this article author illustrate a homemade yagi antenna for satellite operations. The antenna includes a VHF antenna and an UHF antenna with a band splitter.
    [ Hits: 203 | Votes: 2 | Rating: 7.5 ]
Antennas : Theory
  • Which part of a dipole radiates most? - The title may seem a strange question. Still, it is often said that the part where the current is largest, radiates most. And from that a rule of thumb follows, saying that if you don't have enough space to hang a complete half-wave wire dipole then try to make the central part hang as freely as possible.
    [ Hits: 157 | Votes: 1 | Rating: 9 ]
Antennas : Tuners
  • A Versatile SOTA Antenna Tuner - This is a detailed, technical piece, intended mostly for makers and more creative activators, who enjoy building and using their own tools on the summits. A multiband portable antenna tuner supporting 10W, small and light, suitable for SOTA operations
    [ Hits: 262 | Votes: 2 | Rating: 10 ]
Ham Radio : Clubs : North America : USA : Colorado
  • Pikes Peak Radio Amateur Association (PPRAA) - The Pikes Peak Radio Amateur Association (PPRAA) is an American Radio Relay League (ARRL) Special Service Club located in Colorado Springs, Colorado. The PPRAA is a social and technical membership organization which provides educational and recreational activities for its members intended to further their knowledge in the art of radio communications.
    [ Hits: 63 | Votes: 0 | Rating: 0 ]
Manufacturers : Baluns
  • OM0ET Antennas - Maker of small and compact multiband QRP UltraLight Magnetic Loop Antennas and UnUn transformer for end-fed multiband antennas
    [ Hits: 311 | Votes: 7 | Rating: 7.57 ]
Manufacturers : Test Equipment : Spectrum Analyzers
  • Saluki Technology Inc. - Saluki manufacturer of Spectrum Analyzer, Handheld Spectrum Analyzer, Signal Analyzer, Cable and antenna analyzer, Network Analyzer|RF Signal Generator, Cable Antenna Analyzer
    [ Hits: 135 | Votes: 0 | Rating: 0 ]
Manufacturers : Transceivers
  • PolEx Technologies - Makers of the The Polar Explorer transmitter, which operates on 9 HF bands from 160 through 10 meters and is capable of 500 watt peak output power on SSB, CW, AM, FM and RTTY. It is intended to be used in conjunction with a transceiver.
    [ Hits: 500 | Votes: 0 | Rating: 0 ]
Radio Equipment : VHF-UHF Handhelds : Baofeng UV-3R
  • Baofeng Mic Pin Out and Programming Cable Schematics - Speaker Microphone Pin Out, Dual PTT Switching,Programming Cables, SMA Antenna Connection, Extended Antenna Threads for Baofeng UV 3, UV 5 Series handheld transceivers
    [ Hits: 1069 | Votes: 8 | Rating: 8.75 ]
Shopping and Services : Kits and Components
  • Hamtech - HAM-made engineering products supplies and produces coaxial relays, antenna switches, sequencers, roller inductors, variable capacitors, low noise preamplifiers, RF power rotary switches and coil bodies.
    [ Hits: 191 | Votes: 0 | Rating: 0 ]
Shopping and Services : Regional : Asia
  • Wuxi Venus Information Technology - Wuxi Venus Information Technology is an amateur radio devices dealer in China, source for high end, high performance RF products,Control products,APRS products and Commercial products. It provides a variety of solutions to the antennas systems, APRS,electronics kits and electronics components
    [ Hits: 178 | Votes: 0 | Rating: 0 ]
Shortwave Radio : Numbers stations
  • How to Listen to Real Spy Broadcasts - Encrypted messages, fancy technology, spies use them all to communicate, but sometimes the best way to hide is in plain sight. Right now, broadcasting across the airwaves around the world, are automated, anonymous shortwave AM radio stations that most governments won't acknowledge even exist, much less explain
    [ Hits: 243 | Votes: 1 | Rating: 1 ]
Technical Reference : Vector Network Analyzer
  • Measuring with a MiniVNA - Measuring technicques using a MiniVNA, author describes how to determine and unknown inductance, or how to determine an unknown capacitance, crystals, how determine insertion loss and directional attenuation of couples and power dividers, coax switches or even common mode chockes.
    [ Hits: 185 | Votes: 1 | Rating: 1 ]

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