The two basic measurements for DVB‑T/H SFN are Impulse Response and Inband Spectrum. Figure: Impulse Response Measurement and Figure: Inband Spectrum Measurement are typical examples of Impulse Response and Inband Spectrum measurements, but these images may differ from any image that is displayed on your instrument.
Impulse Response Measurement
The Impulse Response function is useful for adjusting the timing of SFN repeaters. This function measures the difference in time of multipath signals. The graph shows the existence of multipath signals and their relative power and time separation, which can be useful for network planning.
Impulse Response Measurement
Inband Spectrum Measurement
The Inband Spectrum measurement is a Frequency Response function. By measuring the channel frequency response, both the multipath effect and frequency selective fading can be observed.
This function is useful for transmitter installation or maintenance because it offers a wide dynamic range (50 dB) on the vertical scale for high-performance transmitters. It also offers precise checks of each carrier by providing a zoom view for all carriers on the horizontal scale.
