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A Useful ATU Circuit


It uses a parallel circuit for 30 - 80 and a series tuned arrangement for the bands up to 10 metres The mode of operation is selected by a DPDT switch
post 18 Aug 2021


Antenna Transmatch tuner Links

205



Tuners all bands antenne Levy
Allows you to easily tune a GP / Levy or a Levy of 2x13.5m on the 8 HF bands from 3.5 to 30 MHz

Tuners in T for antenne filaire
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

Tunner per Antenna tipo canna da pesca
Modifica fatta ad un accordatore ZetaGi M 27 surplus

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

QRP Z-Match
The 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 necessary

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