df antenna

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10 Meters EH Antenna ^pop - PDF file with plans to build an eh antenna for 10 meters band, by lloyd butler VK5BR
[ Hits: 34061 | Votes: 37 | Rating: 5.3 ]

Ground System on a 160M vertical - Ground system measurements on a 160 M vertical by Rudy Severns N6LF
[ Hits: 1913 | Votes: 1 | Rating: 10 ]

7 Elements YAGI for 144 Mhz ^pop - The QM7 antenna is a simple 7 elements Yagi with 3.7 m boom length for the lower 144 MHz SSB/MGM band, in PDF Format
[ Hits: 42745 | Votes: 49 | Rating: 5.87 ]
QM5 Yagi for 2 meters band - The QM5 antenna is a simple 5 elements Yagi with 1.88 m boom length for the lower 144 MHz SSB/MGM band, I used it mainly for Sporadic-E and MS contacts. It exhibits a forward gain of 9.17 dBd; i.e. 11.3 dB forward gain over the isotropic radiator, while the F/R is about 11.5 dB. Elements
[ Hits: 6869 | Votes: 4 | Rating: 5.25 ]
A turnstile antenna for 2-meter ARDF - Antenna design for use with hidden transmitters on international-rules ARDF events
[ Hits: 18218 | Votes: 25 | Rating: 7.49 ]

HF J-Pole antenna - A Simple Nondirectional Antenna for Ten Meters QST February 1950, Easy to build J-Pole antenna for restricted space.
[ Hits: 6616 | Votes: 3 | Rating: 3 ]

Maria Maluca by DL4AC - A PDF File of a Maria Maluca multiband HF antenna with schematic diagram, dimension and plan
[ Hits: 834 | Votes: 0 | Rating: 0 ]

A $20 HF mobile antenna - A few hours of fun with PVC and wire and you have got yourself a respectable road radiator. The antenna consists of little more than some PVC pipe topped by a RadioShack replacement whip antenna and a couple of coils made from a small roll of #14 house wire.
[ Hits: 10547 | Votes: 6 | Rating: 7.33 ]

W6NL 40m Moxon Yagi - Designed and built by W6NL looks like a loaded yagi this 2 element moxon antenna offer 6dbi
[ Hits: 4644 | Votes: 11 | Rating: 4.91 ]

Antennas and Grounds for apartments - Suggestions on finding RF ground when you live in an apartment and you want to setup an antenna
[ Hits: 23167 | Votes: 12 | Rating: 5.75 ]

Crossed Field Antenna - The Crossed Field Antenna (CFA) is one of the applications of Correction of Maxwell's Equations which was used over 150 years ago which was proved these days that the Magnetic Field Source is only the Displacement Current not the Conduction Current . These Corrections was made by an Egyptian Doctor Engineer Fathi Kabbary , who reached the New Correct Theory which shows that the height and efficiency of the antenna doesn't depend on the wavelength
[ Hits: 2308 | Votes: 5 | Rating: 2.8 ]
Understanding Standing Wave Ratios SWR - We worry a lot about Standing Wave Ratio (SWR) in amateur radio since SWR is one indication of how well our antenna system is working. Most HF transceivers and antenna tuners have built in SWR meters. SWR is a measure of a transceiver' s output power verses the portion of that power reflected by the antenna system
[ Hits: 8719 | Votes: 8 | Rating: 4.75 ]

Do You Need an Antenna Tuner - Maybe yes, maybe no. It all depends on the type of antenna and feed line you're using. QST Article in pdf format
[ Hits: 22954 | Votes: 12 | Rating: 4.58 ]

New Carolina windom antenna ^updated ^pop - PDF file by QRP Expressions by By N. T. Len Carlson, K4IWL
[ Hits: 44198 | Votes: 57 | Rating: 7.83 ]

RDF2 two element, close spaced Yagi antenna - This antenna is an adaptation of the RDF2 two element, close spaced Yagi antenna described in the May, 1996 issue of 73 Amateur Radio Today Magazine.
[ Hits: 9111 | Votes: 8 | Rating: 4.49 ]

KB9VBR J-Pole Antennas - All copper J-Pole antennas for sale. 6 meter, 2 meter, 222 MHz, 440 MHz, LPFM, Marine, GMRS. Includes a construction plan in pdf format if you wish to build your own antenna.
[ Hits: 6445 | Votes: 8 | Rating: 6.25 ]

Bicycle-Mobile antenna - WA5FRF VHF mobile antenna for bicycle installation
[ Hits: 6045 | Votes: 2 | Rating: 9.5 ]

A low power 3.5MHz ARDF transmitter - This low power transmitter is developed for ARDF exercising purposes but of course can be used as super QRP transmitter either. With 1 or 2 meter wire as antenna and a ARDF receiver with ferrite-rod antenna the range is about 100m but with better antennas and a 'real' receiver the range is probably much larger.
[ Hits: 2043 | Votes: 4 | Rating: 6.5 ]