A series L-C circuit can be used to match a low-impedance load, as presented by a quarter-wave

Lunghezza del filo? la massima possibile, 20 mt o giù di lì vanno bene per la gamma 7 mhz

Tunner ad L, accorda facilmente tutte le gamme HF partendo da un antenna random long wire

Antenna matching systems with a parallel resonant circuit and inductive coupling were once very good

Very common among antenna tuners is the pi circuit, also known as the collins filter

Per il contenitore ho usato una scatola per montaggi elettrici in pvc tipo gewiss di dimensioni 30x20x6 cm schermandola poi internamente con della comune stagnola

Easy and cheap automatic antenna tuner which can works as locale or as remote. tuner has eeprom memory for store settings for faster tunning and four interfaces

A tunner witha balun t200-6 should give a better q but the t200-2 was in stock and gave me sufficient tuning range, the capacitors are radio types and can be used up to 150 watts

Continuous tuning from the 20 meter band to the 10 meter band

One of the most practical and useful tuners i ever owned was the one made by the dentron company back in the 1970s and early 80s

With the zm-2, a tuning solution quite close to optimum can be found without even transmitting, just by listening for a peak in receiver noise

The radiator itself is simply a half-wave long piece of wire, i used an unzipped length of zip cord, a full free-space half wave length about 41.6 metres

Ez-tuner is a shielded rf compartment which contains two cardwell-johnson 3500v variable capacitors, two 50pf/5kv

The toroid is a standard hf ferrite toroid commonly used for balun construction, because the fc-40 is limited to 100 watts, the toroid only needs to be modest

I found that the ultimate transmatch is not as good at suppressing harmonics as the spc so i decided on the spc transmatch

Transmatch Hf che permette di utilizzare una grossa doppia filare

Frequency range depending on the coil min & max inductance 160m...6m

The dual split-stator 250 pf/section millen 16250 capacitor on the left, and the 200 pf millen 16520a capacitor on the right

Antenna is an 88ft doublet, so i need to use a tuner with my rigs.the k3 and k2

Build a new ATU that would cover 160m and also handle much more power

Grazie al transmatch, il generatore vede l'impedenza ottimale che gli consente d'erogare la massima potenza possibile

Icom tunner AH4 with installation of the same for stationary or portable operation, making it easier to use

Most signal generators have an output impedance of 50ω. to align an fm tuner or measure its performance, it's best to match this to the tuner's 75ω input impedance

This circuit is for a QRP low power antenna tuner, a transmatch, for use in the short wave amateur radio bands from 3-30 Mhz

Two variable capacitors are very compact, a simple srw bridge allows to indicate the best tuning positions and an additional 150 pf capacity can be switched on, to help tuning shorter wires if necessari

used a t-200-6 core. the type-6 core over the type-2 because it provides a higher q over most of the hf range

The tuned circuit inductor is a t130-red toroid core, this is close wound with 50 turns 20 gauge enamelled wir

Qro atu dummy load power meter intended to be capable of handling the full 400w

With baluns and b.a. hf sym/sym of f4dme on a levy of 2 times 21.5 m of radiating and 41 m of descent c.v. f0eol of 2 times 20/290 pf 2200 volts

Un piccolo accordatore nella configurazione ad L

At the rear of the roller inductor is the 1-to-4 balun the balun is set on top of a standoff isulated

The balanced-line tuner oach coil is wound with 50 feet of quarter-inch copper tubing and the variable capacitor has a 1-inch plate spacing

This project uses some small gearmotors to drive the inductor switch and the two air variable capacitors on an MFJ 1500W antenna tuner

W1fb invented the spc tuner, i currently use a vertical antenna with 64 radials that covers all ham bands between 10-40 meters, i contemplated on the idea that there might be an antenna tuner design that could match this antenna on 160m

Tunner ad L, accorda facilmente tutte le gamme HF partendo da un antenna random long wire

This is a high-pass t-filter consisting of a variable inductance inductor and two cvs, each of these 2x125pf cvs has a capacity of 250 pf

Modifica fatta ad un accordatore ZetaGi M 27 surplus

The primary function of a tuner is to present the radio with its specified load impedance

Built the z-match in about 3-4 days using available parts, decided i wanted to use my z-match for 7-21 mhz operation so i adjusted the coil l1 to give me that range