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High-Power Antenna Tuner
The dual split-stator (250 pF/section) Millen 16250 capacitor on the left, and the 200 pF Millen 16520A capacitor on the right
post 14 Oct 2024
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
Tuners antenne 7 MHz with only one CV
A 1: 1 ratio balancer made with a T200 toroid makes it possible to connect the transceiver with a coaxial cable to the symmetrical circuit formed by the chokes and the CV. As the isolation of the CV is weak
Tuner for HF
193
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
A 1: 1 ratio balancer made with a T200 toroid makes it possible to connect the transceiver with a coaxial cable to the symmetrical circuit formed by the chokes and the CV. As the isolation of the CV is weak
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
Interface-for-digital-broadcasts-with-integrated-audio 4-port HUB, with a TUSB2046. With port 1 of the HUB we drive the FT232RL; with port 2 the PCM2904, furthermore, we decided to leave ports 3 and 4 free