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Homebrew SGC SG-237 Control Box
It with a 65 foot long inverted-L antenna and I can operate all bands from 160m to 6m with 100 W power levels and this coupler has no problem
post 16 May 2026
Antenna Transmatch tuner Links →
Transmatch automat
Working: 3.0 to 30 MHz. Input power: Over 2500 W PEP
Transmatchs varios acopladores de antenas
As a reference for these projects, variable capacitors of around 410pf, common in valve receivers, are in most cases perfectly usable for low or medium powers
Tuner W1FB scheme Compiled
Variable capacitors have a capacity of 200 pF, for a power of 2 kW at the peak, the gap between the plates should be about 2 mm. L1 - coil with slider, maximum inductance 25 mH. L2 - 3 turns of 3.3 mm bare wire on a 25mm mandrel
Tuner for HF
172
Working: 3.0 to 30 MHz. Input power: Over 2500 W PEP
As a reference for these projects, variable capacitors of around 410pf, common in valve receivers, are in most cases perfectly usable for low or medium powers
Variable capacitors have a capacity of 200 pF, for a power of 2 kW at the peak, the gap between the plates should be about 2 mm. L1 - coil with slider, maximum inductance 25 mH. L2 - 3 turns of 3.3 mm bare wire on a 25mm mandrel
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