Measuring System Performance: Measuring Signal Levels
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6
Fig. 6-2 LEVEL Mode Display, Specific Frequency Only
Note that dual audio carrier channels display two audio graphs.
Scrambled channels have the same appearance as non-scrambled
channels (but with a different icon—see page 46 for a list of channel type
icons). You must designate scrambled channels in the EDIT CHANNEL
PLAN submenu of the CHANNEL PLAN menu.
See Also
½ The "Edit Channel Plan" section in Chapter 3 explains how
to designate scrambled channels (page 43).
Tilt Measurements
Tilt is transmission loss in a coaxial cable. Transmission loss increases in
proportion to the square root of frequency, thus affecting the tilt. As
displayed by an SDA field unit, Tilt mode shows levels across a band of
channels. Tilt appears as the slope between lowest to highest channel.
Levels for each intermediate channel should reach the line.Tilt
compensation adjusts amplifier frequency/gain response to offset Tilt
attenuation.
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