Impedance transformer wired through a double pole 6 position rotary switch gives various step up impedance ratio for short vertical antennas on low band HF frequencies.
See articles @ web.archive.org/web/202312041...
Multi-Impedance Switching Transformer pdf. web.archive.org/web/202312041...
Determining Short Antenna Efficiency pdf. www.qsl.net/w5vv/AntennaEffic...
Негізгі бет Multi-Impedance Switched Transformer for Short Vertical HF Antennas
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