8-VSB - PALSpectrum Analyser Display

Spectrum Analyser display :

DTTB

(8VSB)

Vision Carrier

Sound Carriers

Chroma

PAL

Dependent upon

Resolution B/W

setting.

eg. If Res. B/W = 300KHz

“A”= D + 10Log (5.4 / 0.3)

= 22.5 dB

A

D + 11.3 dB

D = DTTB to PAL ratio ( eg D = 10 dB )

DTTB power = average heating power

PAL power = the equivalent CW power of

peak sync Vision Carrier power

Note : It is usually less than this value as resolution B/W shape collects more power than the ideal rectangular filter. Also the peak to average character modifies this value.

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