Another way to minimise the loss of an antenna using coax traps is to use the minimum length of coax needed to achieve resonance

This antenna reduced dimensions for 80 and 40 Meters

This dipole antenna functions as a half wave dipole in the 40 and 20m bands, in the 80m band it is a shortened dipole and in the 15m band it is a 3/4 wave dipole when the 40m 7mhz thread resonates at 15m 21mhz

Known as the ocd - ocf by off-center-dipole, or off center feed or simply windom

A dipole for 40 meters in inverted v, with twice 10.25 meters of 2.5 mm2 copper wire in section, i decided to transform it into a w3dzz to be able to work also in 80 meter

The name rhombic antenna comes from the fact that it is made up of four conductors, in the form of wires

The classic open-wire feed line dipole antenna is easy to install and offerssurprising performance on several bands

Due versioni, una lunga 15.4m che risuona dai 40 ai 10m ed una lunga il doppio 31m che permette un ottimo funzionamento anche in 80m

Accorciata, solo 10 mt di lunghezza, sulla banda 80/40 metri con balun 1:1

La morgain è una antenna semplicissima ed estremamente economica che richiede solo un po' di attenzione in fase di taratura

Utilizzando dei software specifici e' possibile progettare e simulare il funzionamento di questa antenna

L'antenna può essere installata su qualsiasi balcone di 3-6 metri di lunghezz

Si tratta di un dipolo con alimentazione asimmetrica,in grado di risuonare dai 10 agli 80m

La risonanza è alquanto larga e vi sorprenderà vedere unacurva di risposta abbastanza piatta

To optimize the system, you should put the tuner right at the end of the lineup

It is a multiband antenna which is similar to a center-fed or a Levy antenna of particular dimensions chosen to obtain a low impedance on frequencies close to 3.5 7 and 14 MHz

This design is for all band use 160 thru 10 using a tuner

The Lazy H is probably the most elementary form of curtain antennas

The advantages of a broadband antenna are obvi-ous fewer adjustments during tune-up, for some of the new broadband transceivers andamplifiers, a broadband antenna means no tune-up at all

Here is my home hf antenna, it is an off centre fed dipole, with 10 feet of vertical radiator, it needs no tuner on 40m, 20m and 10m

This antenna, i made, not only covers 10-20m but tunes quite well to 40 and 80, has a reasonable swr at 6m! and a good swr from 120mhz to over 150MHz

The 5 radiating wires are spread to 1.2 m. with un balun 1:4

The calculation of the linear load is made by adding 30% to 30% removed from the irradiator, the dimensions being as follows, total length of the irradiator: 5, 51 meters length of each linear load: 1.54 meters

Questa antenna risuona sui 10-15-20-40-80, il tratto di discesa in piattina deve essere il più lontano possibile da parti metalliche

Questa antenna risuona sui 10-15-20-40-80, il tratto di discesa in piattina deve essere il più lontano possibile da parti metalliche

La realizzazione è molto semplice, a parte la noia di avvolgere 2 bobine delle dimensioni richieste

Indoor multiband dipole 40m -10m-15m dipole

La W3DZZ è in grado di lavorare sui 10 - 15 - 20 - 40 - 80 metri

The 17 meter antenna is mostly a 1/2-wave sloper with an extra 3 feet going down the other side

A special form of a windom antenna is a fd4 from fritzel. that is a wire of half a wavelength on the lowest frequency, the antenna is fed at a third of its length with a suitable hf transformer and coaxial cable

All bands from 80 to 10 meters with the help of a simple antenna tuner though

The extension spool consists of a piece of water pipe with a diameter of 48 mm and a hard PVC plate

The G5RV antenna , with its special feeder arrangement, is a multiband centre-fed antenna capable of very efficient operation on all hf bands from 3.5 to 28 MHz

This multidipole for 80,40,20 and 10 meter

Hf horizontal center-fed antenna

Indoor multiband dipole 40m -10m-15m dipole

Each arm, in the version from 10 to 40 meters, measures 7.77 meters

Limited Space Multi-Band Antenna

Multibands wire antenna with linee feed 600 ohm

La lunghezza dell'antenna finita, ha un totale d'ingombro di circa 10 metri per 0,50 il filo elettrico necessario è di m. 32 per braccio, della sezione 1,5 mm. quadri, in totale occorrono 64 metri di filo

It can be built to cover all bands, always for two bands at a time, with resonance in the other bands. The most famous was at 80-40 meters due to the

Morgain per i 160 metri é stata da me progettata, costruita e sperimentata ottenendo ottimi risultati, soprattutto tenendo conto della sua lunghezza che è di appena 40 metri

The spiderbeam is a tribander yagi for 20-15-10m,it is constructed of 3 interlaced wire yagi antennas strung on a common fiber glass spider

Portable antenna for 80 m - 40 m - 30 m band, radiant up to a radius of approx. 300 km 100 watt cw max. 50 ohms, coax balun

Multiband antenna fed with true open wire feedline -sometimes known as tuned feeders seems to have been forgotten by many

Is a simple, low-cost, trapless short vertical antenna which amazingly works on three HF bands 20, 15 and 10 meters

Windom shown cut for 40, 20, 15 and 10 meters, it will operate on 80, 30, and 17 meters but will require a tuner for these bands

Theoretically, the Trizepp should be roughly 9.8 dB above the FatLoop at the maximum

Twin lead cable is a two-conductor flat cable used as a balanced transmission line to carry radio frequency rf signal

L'antenna può essere installata su qualsiasi balcone di 3-6 metri di lunghezza

This final version of the multiband-H-Pole Antenna is no longer a vertical folded doublet, but again an off-center-fed-dipole

The windom antenna is an off center fed dipole,resonating from 10 to 80m

Adattare l'impedenza della discesa a 50 ohm con il valore tipico di questa antenna, che sia aggira intorno ai 300 ohm