Wavetek 147 Dokumentacja Pobierz pdf (Strona 130)

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Reverse Path Troubleshooting: Evaluating TDMA Return Path Signals

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Fig. 5-6 Signal with High Noise Floor in Zero Span

Intermittent ingress along with the TDMA signal is a pesky problem when

troubleshooting return path issues. This is a hit-or-miss game. With a

spectrum graph you are completely at the mercy of luck. As you can see,

when there is a signal with intermittent ingress (see Fig. 5-7), there are

additional pulses. The “U” marker in this screen clearly shows a peak “D/U”

of 30 dB. The average noise floor is still well over 50 dB down. These

impulses are a mere 10 uSec every 5 mSec. This leaves the probability of

catching these in the spectrum graph less than 0.2%. However, they are

readily apparent in the ZERO SPAN screen.

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