Chapter 4
PC-IP Operation
35
Select the appropriate video to audio frequency offset for the
second audio carrier of the channel (0.0 to 8.0 MHz). Setting the
modulation type will set the default offset. 0.0 MHz indicates
that no second audio carrier is used.
Modulation type controls the entries in symbol rate, bandwidth,
video-to-audio separation and secondary video-to-audio
separation cells. If NTSC is selected, the symbol rate is set to N/
A, the bandwidth is set to 6 MHz, V/A1 is set to 4.5 MHz and V/
A2 is set to 0. If QAM 64 is selected, the symbol rate is set to
5.056941 MHz, the bandwidth is set to 6 MHz for Annex B & C
or 7/8 MHz for Annex A, V/A1 is set to 0 MHz and V/A2 is set
to 0. If QAM 256 is selected, the symbol rate is set to 5.360537
MHz, the bandwidth is set to 6 MHz for Annex B & C or 7/8 MHz
for Annex A, V/A1 is set to 0 MHz and V/A2 is set to 0.
Multiple Cell Changes
To facilitate changes to large channel plans, multiple channels
may be selected for editing by using the Shift key or holding
down on the mouse key while selecting multiple consecutive
channels. To select multiple channels (Figure 4-15), click on the
rows or cells and hold down the Shift key (or mouse button)
while you make the selections.
Figure 4-15
To edit multiple channels at once, click on a row to insert or
delete channels. Single rows or multiple rows may be selected
and “mass changed” by clicking on the Multiple Edit button.
