ld ratio

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ld ratio

154 links

Antennas : 20M : 20 meter Dipole Antennas
  • An effective 3 band Wire DX aerial - A 3 band dipole for 10 15 and 20 meters band, easy to build, and that can be easily setup in any occasion, inclunding field days or portable operations
    [ Hits: 13435 | Votes: 5 | Rating: 6.4 ]
Antennas : Feed Lines
  • Build An LF Antenna Analyzer - A Portable Low Frequency Antenna Analyzer, For those of us who like to play with antennas on the ham bands, one of the handiest tools to have around the shack is an "antenna analyzer". These gadgets combine a signal generator and standing-wave ratio (SWR) sensor in a small battery-powered unit.
    [ Hits: 4567 | Votes: 2 | Rating: 5 ]
Antennas : Portable
  • Portable HF Antenna for the field day - This article describes a project of asymmetrical hatted vertical dipole, a portable antenna that can be used for field day operations, sota, campings or even for fixed installations. This is a freestanding 20-10m antenna that is really easy to build, easy to tune and relatively easy to carry.
    [ Hits: 1643 | Votes: 2 | Rating: 7.5 ]
Antennas : Satellite
  • Types of Coax in Satellite operations - Coax is a very important part of a satellite station. It is almost as important as the antennas you choose. This article discusses choosing coaxial cables for satellite communication, emphasizing factors like line loss. It compares types such as RG-8, RG-58, Belden 9913/9913F, LMR-400, and hardline, highlighting their impact on signal preservation.
    [ Hits: 2395 | Votes: 1 | Rating: 9 ]
Antennas : Theory Antennas : Traps
  • Building Coaxial Traps - This page describes the design and construction materials W8WWV used to build a coaxial cable trap. A coaxial cable trap is a parallel resonant circuit that is usually inserted in an antenna element to enable multiband operation.
    [ Hits: 10267 | Votes: 5 | Rating: 8.2 ]
Antique Radios : Collections
  • Old Radios.nl - Antique old radio restoration, european radios collection
    [ Hits: 602 | Votes: 2 | Rating: 9 ]
Antique Radios : Repair and Restoration
  • Radio Repair Guy - This site is dedicated to the repair, restoration, preservation and sale of old collectable radios, both bakelite and wood.
    [ Hits: 856 | Votes: 2 | Rating: 10 ]
Manufacturers : Antenna Masts and Mounts
  • RAM Mounting Systems, Inc. - Ram mounting systems is a world leader for design and manufacturing of mounting applications. ram mounts offer more than 900 interchangeable components for unlimited uses and configurations.
    [ Hits: 1734 | Votes: 2 | Rating: 5.5 ]
Manufacturers : Antennas : HF : Vertical Antennas
  • 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: 3973 | Votes: 1 | Rating: 1 ]
Operating Aids : Beginner's Guides
  • Operating Practice - ON4WW - A must read guide for all new and old operators. This document was originally written with the prime focus on DXing and pileup behavior. Suggestions by proofreaders have been implemented; the document is not as narrowly focused anymore as originally intended. It contains hints, tips and tricks for newcomers as well as old-timers. Additionally there are VHF/UHF operational matters, DX Cluster ethics, COPS, Conflict Situations and more.
    [ Hits: 2486 | Votes: 5 | Rating: 8.6 ]
Operating Aids : History
  • Nicola Tesla autobiography - Free pdf book on Nicola Tesla. He is the true unsung prophet of the electric age; without whom our radio, auto ignition, telephone, alternating current power generation and transmission, radio and television would all have been impossible
    [ Hits: 444 | Votes: 2 | Rating: 5.5 ]
Operating Aids : Radio Spectrum
  • Hellschreiber frequencies - Suggested frequencies for HELLSCHREIBER operation by the feldhell club
    [ Hits: 2016 | Votes: 6 | Rating: 7 ]
Operating Modes : Longwave
  • Long Wave Radio - The World of LF, by G3YXM reference site for longwave operations. Introduction to operating on 136 and 501 Khz
    [ Hits: 626 | Votes: 1 | Rating: 1 ]
  • Low Frequency operations by W3EEE - A squint at the world of LF This website was initially thrown together to provide ready availability to data being collected from the measurement of a transatlantic LF (Low Frequency) path.
    [ Hits: 480 | Votes: 0 | Rating: 0 ]
Operating Modes : Mobile
  • K0BG's ham radio mobile operator web site - This site is dedicated to mobile amateur radio operators, old and new alike. Whether you are into HF, or VHF operation, I trust the information presented will increase your enjoyment of our great hobby. With safety as a byword, there are articles on amplifiers, antennas, bonding, impedance matching, installing hardware, mobile equipment, noise and RFI abatement, wiring, and much more. I do my best to keep these articles up to date, and easy to follow.
    [ Hits: 4855 | Votes: 10 | Rating: 8.7 ]
  • HFPack - HFpack provides an information exchange about transceivers, antennas, systems, HF packs, propagation, new developments and techniques in HF portable operation. Radio Amateurs are invited to participate in egroup and on-the-air nets around the world.
    [ Hits: 738 | Votes: 4 | Rating: 10 ]
Operating Modes : RTTY Software : Hellschreiber
  • WinHell - Feld hell freeware windows program that permits RTX hellschriber operations by PA3BQS
    [ Hits: 1435 | Votes: 2 | Rating: 4.5 ]
Software : Logging
  • SQUIRL Field Day Logger Software - Squirl field day logger - a no-frills, easy to use software logger designed for field day logging operation. by KC8OPV
    [ Hits: 1086 | Votes: 6 | Rating: 7 ]

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