5-5
What IMPROVES ACCURACY AND REDUCES WASTED TIME in
troubleshooting reverse path problems?
•
Being able to compare the Headend noise spectrum to the local
spectrum. This allows you to know if a problem you see in the
field matches the Headend problem or not.
•
Using Dwell Time in spectrum analysis: the more time a meter
spends looking for ingress, the more likely it is to catch a random
problem.
•
Fast scanning gets data in real time, and makes diagnosis much
faster Low-pass filters allow you to separate intermod problems
from CPD, and to make the correct diagnosis.
•
Preamps allow you to use an amp test point and still see noise
accurately. Otherwise, the reverse network must be taken down
to get a high level signal for analysis.
•
Ease-of-use. Fewer things to carry means less work; long
battery life means fewer trips back to the Headend or truck for a
new battery; light weight means faster time to get connected
(and less worker’s compensation money spent).
What ‘arms’ can be used to “wage war” with reverse ingress:
Use an SLM/sweep meter with spectrum display. The best solution.
Use a spectrum analyzer with battery and filters. More stuff to carry,
but it still works.
Use a spectrum analyzer in the Headend, a spare video channel, a
modulator, and a TV. Disconnect the Legs of the return path and
look at the noise to see if the problem went away. Creates service
outages and doesn’t work very well.