Description and Basic Operation of the SDA-5500 and 5510: Basic Modes of Operation
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Tuning by Channel or Frequency
When the level mode is selected, you can tune the unit by channel or by
frequency. In the channel mode, the channel and channel label will appear at
the top of the display. The left and right diamond keys can be used to
decrement and increment the channels. Channels can also be entered using
the numeric keys followed by the CHAN key.
To tune by frequency, use the numeric keys to enter a frequency followed by
the FREQ key. The frequency can then be decremented by using the left
diamond key or incremented using the right arrow keys. The step size when
tuning by frequency is programmed during setup.
Scale Adjustment
The up and down arrow keys can be used to adjust the reference level on
the analog meter. This is helpful when the audio and video levels differ by
large amounts.
To automatically scale the analog meter, press the FCN key followed by the
Enter (Scale) second function key.
In channel mode, the level is represented using dual analog meters: one for
the video carrier and one for the audio carrier (two in the video + dual audio
channels mode).
In the frequency or single channel mode, the level is indicated by a single
meter.
Tilt Mode
A cable system is designed for unity gain, and the output of each like type of
amplifier (trunk, bridger/line extender) should be as close to identical as
physically possible. The amplifiers are set up with specified levels for signals
at the high and low end of the spectrum. These are used for Automatic Gain
Control (AGC) or Automatic Slope Control (ASC). In the amplifier balancing
process, these signals are measured and adjusted to specification. Before
making an adjustment, you must ensure that there are no problems in the
system that should be repaired rather than compensated for with an
adjustment.
Information displayed in the Tilt mode is as follows (see Fig. 13-8):
• High and low carrier frequencies
• High and low carrier levels
• Tilt measurement
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