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SADARS

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17 Mar 2022 - Part two, Optimising small antenna systems by Graham, G4JBD

Posted: 18 Mar 2022 03:36 AM PDT
https://sadars.co.uk/wp/archives/3073


As a follow up to last weeks presentation, Graham started with a short refresher of what to consider when planning an antenna. By using Sim Smith
he demonstrated how to choose correct inputs and the results of those
choices. He showed that power could be lost due to the wrong choice and
correct matching provided the best power transfer from the rig to the
aerial at the chosen frequency for that particular aerial. These results
can be seen in real time using Sim Smith which would be rather laborious to calculate using a paper Smith Chart.

To further curtail losses, Graham suggested materials suitable for aerial
wire and also inductor construction. He pointed out that lots of gain can
be found if you know where the losses are!

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