To amplify the TV signal, a high-frequency amplifier is connected to the TV antenna output. Various amplifiers are made for this purpose, typically containing one or two transistors. I have one such amplifier, called the SWA-3. This amplifier uses two BFR93A transistors and has a gain of 5-24 dB (48.5-790 MHz), reaching its maximum gain at 500 MHz.
Coil L1 contains 4 turns of 0.2mm wire with a coil diameter of 3mm.
A transformer is installed at the amplifier input. It is necessary to convert the antenna impedance of 300 ohms to the amplifier's impedance of 75 ohms. This transformer uses a ferrite ring from an unknown manufacturer, but I'll keep it along with the BFR93A transistors.
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