This antenna was made for YT1BB who was by no means satisfied with his original HyGain antenna HG205BA

Questa antenna ha due meriti che è pressochè invisibile ed ha un costo irrilevante

The Beam is a coax-fed version of the ZL-Special. The reflector is fed 225° out of phase

No other antenna has a better relation between gain and expense than the 2-Element-Yagi

This antenna was designed for the low end of 2 meters and Larry shares his fun with it with everyone who loves homebrewing antennas

La 3 elementi X è una yagi che potrà interessare molti OM per la sua semplicità

Do not change the tapering of the elements! Other diameters and lengths of the element parts will cause severe problems and other dat

Discarded antennas, which lie in sheds or warehouses, all these antennas can be easily redesigned or redesigned in just a few days into new, high-end antennas at a really minimal cost

In a first step all dimensions on the existing ZX 4 element 21 MHz antenna were measured and fed into EZNEC5+, this showed a well performing antenna for the 15m band

After lots of experimenting the results are shown below

Uno stack verticale, due antenne poste una sopra l'altra, oltre al guadagno totale che si vuole ottenere, bisognerà tener conto di un'altro fattore, e cioè la distanza che si dovrà mantenere fra le due antenne

La radiocaccia ardf amateur radiodirection finding è un hobby molto diffus

Accoppiatore di due antenne di inpedenza ogniuno di 50 ohm è composto da due linee egual

Nel gamma match, per cancellare la reattanza induttiva introdotta dal sistema, basta aggiungere il condensatore C2

Ogni semielemento è formato da quattro sezioni telescopiche di tubo in alluminio anticorodal da 016 a 25 mm con spessore 1 o 1,5 mm

L'antenna di tipo Yagi è la piu diffusa, in assoluto,è formata da due o più dipoli cilindrici accoppiati ed eccitati in fase,la configurazione più popolare è formata da un solo elemento, con l'aggiunta di un numero di altri non direttamente eccitati induttivi, detti anche parassiti

Tape measure beam optimized for radio direction finding

Up antennas to either beam in different directions at the same time or just to stack them and get a lower angle of radiation

Calculator yagi to produce dimensions for a DL6WU style long Yagi antenna

Two driven elements, opposite voltage feed on all bands open sleeve feed on 15 and 17m to two elements band switching partly by relays, 15/17m Band combination 20m 17m and 15m Integral impedance matching unit

Questa antenna per HF è stata realizzata in un materiale poco usuale, cioè tubi in plastica rivestiti di foglio d'alluminio

Come devo distanziarle tutte queste antenne VHF e UHF sul mio traliccio o torre

The distances between reflector-radiator and radiator-director are the same on all bands from 10 to 17m, when changing the band you only have to adjust the element-lengths

There are effectively two types of feed arrangements, balanced and unbalanced, balanced feed line are readily available in various impedances (75/300/450 Ω), but the use of a balanced feedline presents some physical requirements that are not easy to get around

A cost effective and reliable method for fixing antenna elements

Come potete constatare con questo artifizio creiamo un condensatore in cui un'armatura è rappresentata dalla superficie interna del tondino

Eight element cheapo log periodic dipole array

The simplest yagi-uda antenna consists of two elements, a radiator and a director, a radiator and a reflector

Monopole array installed on top of vehicle

It is a well known phenomenon, that the radiators resistance in a Yagi structure drops down by adding parasitic elements to a dipole as a radiating element

A multiband yagi antenna 6 to 30 meters band

Now it should be a directional antenna for shortwave, for the time being for portable activities, possibly later stationary, after a lot of research, I have shortened directional antennas

The antenna is built on a lightweight frame of non-conductive materials, in an X

K4EAA Antenna mononband yagi for 20 m

The beam has only one feedpoint with 50 Ohm and has an open-sleeve element for 12 m

Construction principles for open-sleeve elements in antennas duoband-yagis

ortable 3-Band Yagi photo

Cut two lengths of coax exactly to a multiple of a half wavelength, and connect them to a tee connector

La prova della lampadina

Un'antenna direttiva tribanda, di piccole dimensioni, abbastanza efficente, non troppo pesante

Producing a theoretical 2.5 dB increase in forward gain

Stacking Distance Calculator for Yagi-Uda Antennas

With the success on the invisible attic wire beam, a lot of club members showed their interest on this trial and discussed possibility of similar application

Two identical yagis can be stacked so that their capture areas just touch, that distance will give close to the maximum achievable gain

What are the reasons for stacking anyway?, would building a bigger yagi better suit our needs?, if we stack, what order of gain increase can we expect

When a 2-way splitter is used as a combiner, one quarter of the input power is reflected back towards the input, one quarter of the input power is diverted to the other input, and one half of the input power is forwarded to the intended load

The bigger the capture area of any antenna, the higher is its gain, a longer yagi - if it's well designed - will have more gain and a larger capture area than a shorter yagi

Eight element cheapo log periodic dipole array

This antenna evolved during my search for a beam with a really great front-to-back ratio to use in hidden transmitter hunts

If a conductor of length equal to half a wave is placed near a dipole, the electromagnetic field radiated by the latter induces an HF current of the same frequency but of much less amplitude in the conductor

The Clemens match is easy to make and reliable, and is preferable to a single Gamma match as it is balance

The antenna should cover 20m and possibly 40m band,the whole antenna kit should be light enough for hand carrying to most remote area

The Clemens match is easy to make and reliable, and is preferable to a single Gamma match as it is balanced

The 3 element is a commercial antenna by pan international, which i slightly modified for good performance on the 10m amateur-radio band

Una 2 elementiYagi per 1 10, 15 e 20 metri in cui i rispettivi dipoli irradianti alimentati dalla stessa linea coassiale

The Hexbeam is a great little antenna! It should be high on your list of options if you want a design that can be "multi-banded

Il punto fondamentale è la spaziatura tra il dipolo è gli elementi parassiti, infatti questa misura va a variare le caratteristiche dell'antenna

Direttiva quattro elementi monobanda per i 14 MHz senza trappole

10m/15m/20m 7 element tribander HF Super-compact yagi antenna

The distance between the two is 1.46 m. Both antenna elements with a length of 7.56 m and 6.56 m are telescopically made of round tube pieces with a diameter of 24 mm to 12 m

The Yagi antenna consists of a single feed or driven element, typically a dipole or a folded dipole antenna

This is the 40 meter linear loading mechanism, which is kind of like a giant one turn loading coil inserted in the element about 8 feet out from the boom reflector shown

To build a copy of a very successful commercial antenna which utilized 2 elements each on the 10m, 15m and 20m bands, it also worked on 12m and 17m with unity gain, this particular antenna design has no traps and the 6 elements were interlaced on the 14 foot boom

The design of this Yagi-Uda antenna is not necessarily the most optimal design for bandwidt

A three element yagi, for the frequency chosen. enter the desired frequency then click on calculate

Select number of elements 2 3 - enter frequency MHz

Log periodic dipole arrays, or lpda is a directional antenna with relatively constant characteristics across it's wide frequency range

Calculator yagi to produce dimensions for a DL6WU style long Yagi antenna

Freq.mhz, boomlength mm, gain db approx., elements, diameter of parasitic elements mm, diameter of boom mm, is the boom isolated from parasitics