Homebrew SGC SG-237 Control Box

 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
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post 06 Oct 2026



Antenna Transmatch tuner Links →

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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
    Scheme tunner for HF


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