Remote ATU   

impedance matching where it's needed

...at the antenna

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October 2011. Well it's changed.... again!  Now it's a simple L match which appears to give a much better performance on 160m


Binary selected L - 1,2,4,8,16 uH plus two Caps in parallel. Larger only used on 160.


Fine tuning of L by servo controlled rotary switch selecting small inductors

Early 2011 I used a large coil in a simple L match with fine tuning by means of some c across the coil tap (see below). Sort of worked but the coil was really too large for the case and probably lossy as a result.

First ATU layout. A remotely controlled balanced ATU based on the RF designs of
Lloyd Butler VK5BR.


An internal view of the remote end


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