Use 6K4 electronic pipe to measure FM toner ----- FM Receiver with 6k4 Tube

Mechanic frequency band with 6k4 electronic pipe, FM Receiver with 6k4 Tube Keywords: tube 6K4, FM receiving circuit Using tube 6k4 and air 365p double-link variable capacitance can be a very simple electronic pipe-frequency receiving head, air capacitance needs to be transformed, remove most of the cartridges and fixing, leaving only two pieces of movie clip, At this time, the adjustable capacitance is adjusted from about 3p to 50 p. The antenna coil L2 is 2 mm on a plastic tube of 16 mm in a diameter of 2 mm, with a pitch of 2 mm. The heat shrink tube is hot tube on the L2 jacket, and the type is purged with a hot air gun, and then the heat shrink tube is set else, and the thickness is 2 mm to 3 mm, and the outer can be around L1. L1 also covered with a diameter of 2 mm. The high frequency choke L3 is in a diameter of 0.25 m. The lattice frame of 10 mm in diameter is 10mm, and the width is 10mm, and the purpose is to reduce the distribution capacitance. The antenna uses a 1.5 m.liver antenna or a soft mock. The receiving frequency band band is substantially capable of covering an 88 MHz to 108 MHz frequency range. Debug method: First use the high-resistance headphones of about 600 ohms, after the wiring check is correct, adjust the voltage control potentiometer W, will hear the ultra-reproduction noise of "silk" in the earphone in place, then adjust the variable capacitor C The broadcast sound can be received in conjunction with stretching or compression coil L1. At this time, the super-regenerative noise is pressed, and the electronic pipe 6K4 gate resistance value and the capacitance value are adjusted, and the power supply voltage control potentiometer W is adjusted, so that the sound is clear and loud. Repeated debugging, making the radio effect. Finally, the signal is input to the power amplifier. Note: The 3, 4 feet of 6k4 need to pick up the power, no writing in the picture.

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