Field Sweeping with the SDA-5000: Considerations for Sweep in the Field
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Fig. 4-14: The SWEEP Tilt Screen
Reverse Sweep Operation (SDA-5000 OPT1)
Sweeping the reverse path is a little different from sweeping the forward
path. Because the system is designed with appropriate spacing for the
forward high frequency range, the reverse path might not require
amplification at each station. The lower frequencies are not attenuated in
cable as much as the higher frequencies. In sweeping the forward path, the
amplifier is aligned such that its output is within certain limits (the amplifier
compensates for the cable before it). However, in sweeping the reverse
path, the amplifier is aligned such that the response at the headend is within
certain limits from this amplifier alignment point. In the reverse path, the
amplifier compensates for loss characteristics in the cable after of it.
It is best to transmit the sweep from the amplifier test point and measure it in
the headend. This ensures that the system is properly aligned to carry
signals in the reverse path.
NOTE: The information in the following sections regarding
sweep operation is valid for both Stealth and SDA
Compatible Stealth sweeping.
However, keep in mind that for SDA Compatible Stealth
sweep to work, you must be using SDA equipment in both
ilt compensation
s displayed here
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