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RF Modulator channel can not receive the reason

source:http://www.dvb-tmodulator.com/news/76.html
Release time:2017-08-24

      RF Modulator channels can not receive the fault in the receiver, and some channels can not receive the failure may occur in the receiver can also occur in the outdoor high-frequency head. Because due to vibration or other causes caused by the frequency of the medium oscillator oscillator frequency serious deviation, the input signal can be close to the high-end or low-end part can not be beat into the first IF signal, so that the receiver can not solve Tune these signals. After excluding this possibility, the cause of the failure can be determined to fall on the circuit associated with the receiver tuning circuit. For RF modulators, the reasons for the channel can not be received may be:

     1, the tuning circuit varactor diode damage or performance deterioration, the oscillation tube damage or performance deterioration, so that the frequency can not change with the tuning voltage or change smaller, resulting in the channel can not be tuned or some channels can not receive.

     2, tuning the voltage input open circuit or ground short circuit (such as filter capacitor breakdown, etc.), so that tuning voltage can not increase the tuning circuit, causing the channel can not be tuned.

     3, tuning the voltage generation circuit is not working properly, if the voltage is too low can cause some channels can not receive, no voltage can cause the channel can not be tuned.

     4, the tuning voltage generation circuit is not working properly, if the potentiometer tuning circuit, it may be poor contact of the potentiometer or the associated op amp circuit is not working properly; for the voltage synthesis tuning circuit, the active filter components may be damaged , Or micro-processing is not normal; for frequency synthesis tuning circuit, it may be frequency synthesizer or microprocessor work is not normal, the output data is wrong.

     5, tuning touch button switch bad or damaged, can not provide the correct input to the microprocessor control signal.

Above is the RF modulator channel can not receive the reasons, we hope to help.

Related tags:RF Modulator,

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