1. UR5FFR: QRP PA 5-12W на RD15HVF1/RD16HHF1 - https://www.ur5ffr.com/viewtopic.php?f=15&t=370&p=4127#p4127
2. Impedance Transformer 1:49 for EFHW Dipole Antenna (Трансформатор опору 1:49 для дипольної антени EFHW) - https://rfsignal.eu/index.php
3. LC Resonant Frequency Calculator - https://www.allaboutcircuits.com/tools/lc-resonance-calculator/
*** Impedance Calculators - https://www.mantaro.com/index.php/resources/impedance-calculator.htm
4. Si5351 Calibrator - http://www.sadarc.org/xenforo/upload/index.php?threads/si5351-calibrator.532/
5. ZL1RS Antenna Projects - https://www.qsl.net/zl1rs/old/ant.html
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