![]() Together with the SWR indication this should give an idea of what happens when tuning the antenna. Don't worry: a poor indication is better tha no indication.įor QRP equipment: my experience is that a tool with a second LED, connected to an RF detector (telescope antenna) that indicates the local E-field is good addition for tuning the antenna to maximum voltage and maximum radiation. Without a transformer (common 1:5 winding ratio should do) the matching can't be obtained.įirst check the SWR indicator LED with a dummy load: does the LED dim completely? If not then the SWR indicator fails. The EFHW antenna impedance can be as high as 1500 Ohm and can only be connected to the TX when there is a transformer at the feedpoint of the antenna the base I assume. This impedance can deviate from 50 Ohm, resulting in an SWR deviating from 1:1. A tuned antenna should result in a real load impedance for your transceiver.
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