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DIY 80M Trapped dipole antenna

This 80M Trapped dipole antenna is the work of Nadisha 4S7NR, modified by YC0HLE which results are matched at a frequency of 3,845 MHz. This design will be resonant at a frequency of around 3,250MHz to 3,850MHz.

Coil inductance = 67.83 µH, made of email wire diameter = 1 mm, diameter of the cocker = 1/2″ paralon. The number of windings is 151 turns. Each removing/adding of 5 cm long elements results in a frequency change of 19 KHz. To adjust the length of the element, the element can be bent (folded) to the desired size.

80M Trap dipole antenna DIY 80M Trapped dipole antenna

The following table shows the SWR test results:
3.810 = 1 : 2
3.820 = 1 : 1.8
3.830 = 1 : 1.4
3:835 = 1 : 1.3
3.840 = 1 : 1.15
3.845 = 1 : 1
3.860 = 1 : 1.6
3.870 = 1 : 1.9

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