am antenna

1484 links - and 8 categories

HF Copper Loop ^pop - A small transmitting loop antenna for 14MHz and 21MHz. This is an antenna you might consider if you have limited space, by Lloyd Butler VK5BR Based on material originally published in Amateur Radio, 11 1991
[ Hits: 24586 | Votes: 20 | Rating: 6.46 ]

A Feasible Full Sized 40 Meter Beam - This project started as a result of renewed interest in 40 meters coupled with the desire for an antenna system that would be more effective than the simple dipole.
[ Hits: 7062 | Votes: 1 | Rating: 1.00 ]

50MHz J-Pole Antenna ^pop - Need a general purpose antenna on the magic band? The J-Pole is an easy-to-build and inexpensive device that provides an omni-directional vertically polarised 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: 32888 | Votes: 14 | Rating: 6.50 ]

Build A Magnetic Loop ^pop - Documents and schema on how to build a Magnetic Loop Antenna fo 80/30 mtrs
[ Hits: 28550 | Votes: 11 | Rating: 6.65 ]

J Pole antennas variations on a theme - Twin lead jpole, ladder line jpole, copper cactus j pole, material list to build your own jpole antenna and a brief history of Jpole antennas.
[ Hits: 4096 | Votes: 2 | Rating: 7.50 ]
J-Pole theory ^pop - The J-Pole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. It does not need a ground plane, radials or a complicated matching system. The J-Pole can be cheaply, simply and quickly constructed using a variety of techniques, some of which are discussed in this article.
[ Hits: 29823 | Votes: 25 | Rating: 6.74 ]
A J-Pole for 2-meters and 70-cm ^pop - An Easy Dual-Band VHF/UHF vertical Antenna made with a TV twin lead and coax cable
[ Hits: 98347 | Votes: 112 | Rating: 6.13 ]

A Small Wire Loop Antennas for 160 meters ^pop - Low noise, receive only coax loop antennas for 160 - 10 meters HF bands
[ Hits: 47116 | Votes: 8 | Rating: 6.75 ]

Portable Loop Antenna ^pop - This loop it is small and light enough to carry while operating, it disassembles into small but rugged pieces that fit easily in a backpack or gym bag, and it can be tuned from 14 MHz to 30 MHz. This tunable magnetic loop antenna is my contribution to the well established art of amateur loop making. Can be tuned from 14 MHz to 30 MHz.
[ Hits: 49569 | Votes: 23 | Rating: 6.26 ]

Antennas : theory and designs - Thierry LOMBRY, ON4SKY, develops in several long articles all you need to know about antennas, their design and performance, for both amateurs and SWL
[ Hits: 9076 | Votes: 11 | Rating: 3.27 ]

OH7SV Matti Hohtola Ham Projects ^pop - The most modern QRP transceiver in 2004,Direct Conversion HF Transceiver with DDS LO, 50 ohm to 200 ohm HF wide band transformers, Wilkinson splitter for RX measurements, Windom baluns 2001/2004, Ferrite rod antenna for 80 meter, Magnetic Loop Antenna for 80 m, Mascot Switched PSU 9320 modification to 8A peak current, 150W MOSFET linear amplifier for 80m, 80 m HF SSB/CW Transceiver
[ Hits: 19710 | Votes: 32 | Rating: 8.12 ]

Grumpy's Communications - Dealer for Charles Gizmotchy Beam Antennas
[ Hits: 1194 | Votes: 5 | Rating: 10.00 ]

DPD Productions - Home of the TrainTenna and MilTenna. Uniquely designed antennas for Transmit or Receive Only, Indoors and Outdoors, Railroad, Aviation, Military, Ham, MURS, GMRS, and other services.
[ Hits: 3508 | Votes: 4 | Rating: 7.00 ]

Gizmotchy Antennas - The Charles Gizmotchy high performance horizontal and vertical beam antennas. Two, Six, Ten and eleven meters antennas
[ Hits: 2970 | Votes: 16 | Rating: 7.50 ]

Adventures in GPS antenna construction - Adventures in amplified GPS antenna construction; an experiment
[ Hits: 1415 | Votes: 0 | Rating: 0.00 ]

ERP Calculator Plus - ERP Calculator is an Amateur Radio software utility designed to perform a side-by-side comparison of two Ham Radio antenna systems. ERP Calculator comes pre-programmed with data files including published data for several popular brands and types of coax cable as well as several popular antenna system brands and models. ERP Calculator displays values of ERP, Antenna Power Gain, Antenna Feed point Power, Antenna System Gain in dB, Antenna Gain in dBd, SWR Attenuation in dB, SWR Power Attenuation, Coax Loss in dB, and Coax Power Loss
[ Hits: 2816 | Votes: 9 | Rating: 5.11 ]
J Pole calculator ^pop - Enter the operating frequency and calculate dimensions of your jpole antenna
[ Hits: 47735 | Votes: 164 | Rating: 6.27 ]

9A3TN homebrew - Home made antennas and rotators
[ Hits: 5648 | Votes: 1 | Rating: 10.00 ]

EI7BA's Amateur Radio Pages - Antennas and homebrew ancilliary equipment
[ Hits: 2556 | Votes: 17 | Rating: 9.18 ]

2m Band VHF antenna pre-amplifier - Homebrew pre-amp for 144-146 MHz amateur band and OSCAR Satellites, using BF981 Dual-gate MosFet. Gain ~15 dB, NF=1dB.
[ Hits: 11722 | Votes: 96 | Rating: 8.61 ]