VHF tuner on the chip KS1066XA1 (TDA-7000). Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / radio reception

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Varicap - KB121A
e/wire - PEL-0,41 10cm
Chip - KS1066HA1

VHF receivers with frequency modulation and therefore a low level of atmospheric and man-made interference, have high sound quality. A set of radio components allows you to assemble a VHF FM receiver based on the KS1066XA1 chip (analogous to the TDA-7000 from Philips). The microcircuit includes a silent tuning regulator that opens the audio frequency path only when there is a signal from the received station.

An electronic device based on the KB121A varicap allows you to cover the domestic (65,8-73,0 MHz) or foreign (88,0 - 108,0 MHz) VHF bands. The output of the receiver is in good agreement with any low-frequency amplifier with an input impedance of at least 22 kOhm (amplifiers for m / s K174UN7, K174UN14, etc.). Connecting the VHF receiver through headphones is shown in Figure 1, and to the amplifier on the K174UN14 m / s in Figure 2. When the amplifier supply voltage is above 4,5 volts, power the VHF receiver through a parametric stabilizer. A stereo decoder can be connected to the output of the radio receiver and thus be able to receive stereo broadcasts.

Main Specifications

Frequency range, MHz - 65,8-73,0 (88-108)
Rated supply voltage, V - 4,5
Current consumption, mA - 8
Sensitivity, μV - 6
Harmonic coefficient at a frequency of 1 kHz - 0,7
Noise/signal ratio, dB - 50
AFC capture band, kHz - 300
Band of reproducible frequencies, kHz - 10
Output voltage ZCH at load 22k, mV - 70

Setting up the receiver consists in setting the limits of the range (65,8-73 MHz by approaching or stretching the turns of the coil L1 (contains 6-8 turns of PEL wire 0,41 mm wound on a mandrel with a diameter of 3,5 mm in increments of 1 mm or 3-4 turns for the range 88,0-108,0 MHz). The antenna can be a telescopic rod or a small piece of mounting wire with a length of at least 0,5 m

Publication: cxem.net

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