Jan 13, 20221 min readReceiving loop antenna with 3 turns i.s.o. 2 turns.Updated: Jan 15, 2022Height and width of the loop are 1 meter.This means that one turn = 2.80 meters.In this case i have used tree turns = 8.40 meters.New coil value = 27 uH.With a minimum capacitance = 35 pF the resonance frequency becomes 4.690 KHz. SWR is then 1.02.Remark: coupling is changed to achieve a good SWR.Measuring results:With a maximum capacitance = 150 pF the resonance frequency becomes 2.500 KHz. SWR is then 1.13.Measuring results:I have tuned the loop @ 3.660 KHz.Loop 3 turns Compared to the loop with 2 turns (see below) te loop with 3 turns is sharper. Sharper means higher Q factor.https://en.wikipedia.org/wiki/Q_factor Loop 2 turns

Height and width of the loop are 1 meter.This means that one turn = 2.80 meters.In this case i have used tree turns = 8.40 meters.New coil value = 27 uH.With a minimum capacitance = 35 pF the resonance frequency becomes 4.690 KHz. SWR is then 1.02.Remark: coupling is changed to achieve a good SWR.Measuring results:With a maximum capacitance = 150 pF the resonance frequency becomes 2.500 KHz. SWR is then 1.13.Measuring results:I have tuned the loop @ 3.660 KHz.Loop 3 turns Compared to the loop with 2 turns (see below) te loop with 3 turns is sharper. Sharper means higher Q factor.https://en.wikipedia.org/wiki/Q_factor Loop 2 turns

1:49 balun with FT400-43 material and the influence of the winding method on the measurement results.

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