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The modulator output level debugging method

source:http://www.dvb-tmodulator.com/news/5.html
Release time:2017-03-02

      The output level of the modulator should normally be adjusted to a lower 5dB than the manufacturer specified output level to leave room for future adjustment. Usually the modulator output level is 110dB or 113dB, the output level can be adjusted to 105dB or 108dB. Moreover, by adjusting the output level of each modulator, the output signal can be output through the mixer. Regardless of the number of channels, regardless of the number of users, should be so set.
      The front-end amplifier should be dedicated front-end amplifier using 20dB gain (if the independent front end, the village is also available 24dB gain common trunk amplifier, then the distributor or branch) for driving the optical transmitter or trunk amplifier or amplifier users behind it. If the input signal level output amplifier mixer over too much, after setting splitter or distributor and then sent to the amplifier, are not allowed to take measures to reduce the modulator output level, otherwise there may be degradation of carrier to noise ratio index. The output level of the total front-end amplifier can generally be adjusted to 72+ gain of G, or slightly higher than 2, and a dB of 3.
      If it is an independent front end of the hotel, the signal from the mixer can directly drive the trunk amplifier or the user amplifier.

      The input level of the optical transmitter can be calculated based on the actual number of channels in the case of a non full load (the independent front end of the village). When the system is fully loaded, the value specified in the specification.

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