Application Notes: Reverse Sweep and Balance
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Step-by-Step Headend Set Up
Reverse Sweep Setup
A diplex filter is used to combine the reverse signals into the rack mount unit,
instead of a splitter or DC-12, because of isolation issues and the return fiber
receiver is more than likely 5-200 MHz. This could cause jitter on the forward
sweep if not set up properly. Because the Stealth Transmitter (Tx) must see
itself, be careful with what is in this "loop", such as launch amps, filters, etc.
It could cause problems.
NOTE: Be sure input levels are between 4 and 12 dBmV.
The recommended is 6 dBmV ± 2. If levels are too high,
distortions will be created in the Tx, which appear as
common path distortions (CPD) when viewing the "Noise"
mode. The recommended input for reverse RF is 0 dBmV ±
2. It may work between ± 10 dBmV, but it depends on the
aggregate noise floor.
REVERSE SWEEP AND BALANCE
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