8-VSB - PALSpectrum Analyser Display
Spectrum Analyser display :
“A”= D + 10Log (5.4 / 0.3)
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.