Converter for receiving audio from television programs. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / radio reception
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For those who want to receive sound accompaniment of television broadcasts on VHF broadcasting radio receivers, I suggest using the converter (Fig. 1) described in the article by M. Ilaev "Simple antenna and UHF converter" (Radio, 1988, No. 2, p. 40). To adapt it to work with a VHF receiver, it was only necessary to change the values of the capacitors C2, C3 and the design of the coil L1.
To receive the sound accompaniment of television programs broadcast on the 11th or 12th channel, it is necessary to wind 5 turns of PEL 7 wire on a mandrel with a diameter of 0,5 mm. Winding - turn to turn. By changing the number of turns of the L1 coil, as well as the distance between the turns, you can rebuild the converter to the desired channel. To prevent the VHF receiver local oscillator signal from entering the antenna and interfering with television reception, it is recommended to connect any (but preferably low-noise) RF amplifier to the converter input. I used an industrial antenna amplifier UTA-4M. The sensitivity of the VHF receiver is an order of magnitude higher than that of a TV and is 3 ... 12 μV, therefore, using the described converter with an RF amplifier, you can receive signals from even distant television stations.
To receive powerful signals from local TV stations, you can limit yourself to using a very simple RF amplifier (Fig. 2).
The converter is mounted in a rectangular case made of tin with dimensions of 60x60x30 mm. First, I vertically soldered the elements C1, R1, L1, L2, C4 and C5 to the common wire, and then soldered all the other parts to them by surface mounting. Instead of those indicated in the diagram, KT315 transistors with any letter index and KT316D can work in the converter.
Author: Yu.Belimov, Usols-Syabirskoye, Irkutsk region; Publication: N. Bolshakov, rf.atnn.ru
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