direction

189 links - and 4 categories

Big Wheel Antenna for VHF - An omnidirectional horizontal polarization antenna for 2 meters band in Italian
[ Hits: 188 | Votes: 2 | Rating: 7.5 ]
VHF Bi-Square Beam Antenna - 2 Wavelength ,2 Meter Bi-Square Beam , 5dbd gain. This antennas are very cheeap to build and their radiation pattern is similar to a figure 8 with maximum signal through the loop but they may be used as a near-omnidirectional antenna
[ Hits: 188 | Votes: 2 | Rating: 9 ]
Two elements Telescopic Yagi for 2 Meters - A lightweight PVC hand-held telescopic 2 element 2m (145 MHz) yagi using two pairs of TV rabbit ear antennas as the driven and reflector elements. Approximate directional gain is 5dB.
[ Hits: 162 | Votes: 0 | Rating: 0 ]

Halo and Stub antenna for 50MHz and 70MHz - Omni-directional mixed polarisation antenna for 50MHz & 70MHz. This is a simple Halo and Stub antenna which provides an omni-directional radiation pattern with mixed polarisation, which I built for use with the SUWS WEB SDR
[ Hits: 137 | Votes: 1 | Rating: 9 ]
50 MHz Omnidirectional antenna - Horizontal polarized omni directional 50MHz Antenna. This antenna is intented to use in a contest station as a second system beside the stacked yagi beam system. An omnidirectional systeem can be an advantage when it comes to short openings on wich the operator must react quickly.
[ Hits: 313 | Votes: 6 | Rating: 2.5 ]

Coaxial Collinear Antenna for 70 CM Band - This coaxial collinear antenna was built to test for my own consumption whether or not this antenna method actually works. the guiding principle is that we have multiple 1/4 wave elements fed in series , the radiation from each adds in phase to produce a large vertically polarised omni-directional antenna with substantial gain
[ Hits: 573 | Votes: 3 | Rating: 6.33 ]

Phased Array Antennas - Phased array antennas are composed of multiple individual antenna elements that can have their phase and amplitude controlled to steer the main beam direction in real-time. They are used in radar, communications, and electronic warfare, and offer improved gain and reduced side lobes. A comprehensive document on Phased Arrays include techniques to increase the Antenna Gain and change the Radiation Pattern
[ Hits: 82 | Votes: 0 | Rating: 0 ]

Beverage Receive Antenna - The Beverage we use is a DX Engineering RPS-1 dual directional 360 foot 109,7 m, oriented due North/South, six feet 1,8 m off the ground. The antenna uses 450 ohm ladder line as the antenna, and 75 ohm RG-6u for the feedline. The antenna runs atop the fence between our property and 5 acres of pasture next door.
[ Hits: 151 | Votes: 4 | Rating: 7.25 ]
Reversible RG6 Beverage Antenna - A project about reversible unidirectional Beverage antennas plus a remote switching system conveniently controlled by the operator
[ Hits: 185 | Votes: 3 | Rating: 7 ]

A simple NonDirectional Antenna for 10 meter - This article is about a simple vertical end-fed-half-wave wire antenna for 10 meters that can be used in case of restricted space.
[ Hits: 701 | Votes: 2 | Rating: 7 ]

HexBeam Antenna Explained - A hexagonal beam is a form of the Yagi antenna which is based on parasitic principles developed early in the last century in Japan for achieving gain in one direction.How HexBeam antennas works. A hexagonal beam operates exactly like Yagi antenna, but instead of a driven element that is straight like a dipole, it is a wire bent into the shape of the letter M.
[ Hits: 170 | Votes: 0 | Rating: 0 ]

Log Periodic Dipole Array Calculator - Description and online calculator for Log Periodic Dipole Arrays LPDA are directional antennas featuring a relatively constant characteristics across a wide frequency range.
[ Hits: 225 | Votes: 2 | Rating: 6 ]

What We Can Expect from a 2-Element Beam - Method, Units of Measure, and the Dipole Standard of Reference. This article helps in understanding where does beam gain come from in directional aerials like in example Yagi antennas.
[ Hits: 101 | Votes: 0 | Rating: 0 ]

Trapped vertical Antenna - This antenna is an omnidirectional and multiband and it is well suited for DX enthusiasts with limited space. Each of the parallel circuits (trap) behaves like an isolator on its resonant frequency.
[ Hits: 356 | Votes: 7 | Rating: 2.71 ]

Mid Sussex Amateur Radio Society - Mid Sussex ARS is an RSGB-affiliated club and meets at its headquarters in Burgess Hill on the 2nd and 4th Friday of each month. They organize various activities ranging from talks by members or guest speakers, evenings on the air using their shack's latest SDR equipment, training evenings and used equipment sales. As well as scheduled club nights, they run many outdoor activities throughout the year, including direction-finding contests, town days, social evenings and Special Event Stations. They even have their own free online training academy!
[ Hits: 12 | Votes: 0 | Rating: 0 ]

WebSDR in Andorra - Listen to online WebSDR located in Andorra Europe. Four receivers on 60m, 20m, 40m, and 80m, connected to a dipole antenna direction East/West
[ Hits: 130 | Votes: 1 | Rating: 5 ]

JUNIOR-2 ARDF receiver - The JUNIOR-2 presented here is a competition direction finder receiver that is easy to build and tune, but has all the features of the "big" receivers. It is especially suitable for beginners, young people or youth groups who have so far refrained from purchasing a 2m direction finder receiver for financial reasons.
[ Hits: 90 | Votes: 0 | Rating: 0 ]

Simple 2.4 GHz SWR Meter - This is a simple 2.4 GHz SWR meter which is based around surplus microwave hardware which can be easily found. The main component is a MECA -20/-20 dB Directional Coupler which has a frequency range of approximately 700 MHz to 2.5 GHz.
[ Hits: 144 | Votes: 2 | Rating: 6 ]

A Simple Field Strength Meter - Mad your own simple FS meter. It is the simplest thing to make and is good enough to see if the antenna under test is radiating more power than your old ground plane, old mobile vertical or just radiating at all in a particular direction or in all directions.
[ Hits: 160 | Votes: 0 | Rating: 0 ]

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: 186 | Votes: 1 | Rating: 1 ]