mediaMAX EVO mediaMAX EVO S2 - FTE Maximal

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ENGLISH 112 User’s Manual - mediaMAX EVO - mediaMAX EVO S2 Good quality DVB-T signal from the air Impulsive response Frequency response In the above example the carrier is a little more distorted than a signal coming directly from a modulator, as it has traveled in open air. The distortion is more visible in the frequency response mode than in the impulse response mode. The above screenshot shows the same signal, but in spectrum mode. It can clearly be seen that the frequency response and the spectrum is very similar, but the frequency response function allows a much better resolution of the DVB-T carrier. Reserved of technical modifi cations and/or errors rev 2.2
ev 2.2 User’s Manual - mediaMAX EVO - mediaMAX EVO S2 Bad quality DVB-T signal from the air Impulsive response Frequency response In the above example the carrier has traveled a long distance, and is extremely distorted. The carrier power is spread around a long time (around 40us). Even with this level of distortion, the signal is usable (quality around 30%). 16.4.6. When to use the impulse response mode or the frequency response The impulse response function is very useful when pointing antennas, as it will be possible to choose the antenna direction in which the carrier echoes are the lowest possible. The Frequency response function will help more to monitor the global signal quality (it is more visual than simple C/N measurement), or to adjust narrow band fi lters. Note: If the echoes fall out of the guard interval, the signal will be almost impossible to decode. This means that it will be also very diffi cult to lock, so probably the meter will not be able to analyze it. Reserved of technical modifi cations and/or errors 113 ENGLISH
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mediaMAX EVO mediaMAX EVO S2 - FTE Maximal

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