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ATSC Modulator signal transmission to debug what

source:http://www.dvb-tmodulator.com/news/54.html
Release time:2017-06-30
  Now, a lot of places need to use the ATSC Modulator. But in the use of the time, the need for debugging the level. How to debug, but also need a technology.
  The output level of the ATSC Modulator should normally be adjusted to about 5 dB below the output level specified by the manufacturer to leave future adjustment. Normally, the output level of the modulator is 110dB or 113dB and the output level can be adjusted to 105dB or 108dB The And the output level of each modulator should be the same, PBI so that through the mixer after the output of a flat signal. Regardless of the number of channels of the system, no matter how much the user should be set up.
  The front-end amplifier, the PBI modulator, should use a 20dB gain front-end dedicated amplifier (if a 24dB gain of the common trunk amplifier is available on the independent front end of the village), followed by a splitter or splitter to drive the optical transmitter Trunk amplifier or user amplifier. If the signal level of the mixer output exceeds the input level of the amplifier too much, you can set the splitter or distributor and then feed the amplifier. It is not allowed to take the way of reducing the output level of the modulator. Otherwise it is possible to deteriorate the carrier-to-noise ratio.
  If the hotel is an independent front end, the mixer out of the signal can directly drive the trunk amplifier or user amplifier.
  The output level of the total front-end amplifier can be debugged as a 72+ gain G, or slightly as high as 2,3 dB.

  The input level of the optical transmitter, in the case of non-full load (when the village is independent of the front end), can be calculated based on the actual number of channels of the system. In the system full load design, according to the provisions of the specification value.


Related tags:ATSC Modulator,

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