8
Reverse Path Set-up:
1.
Take an account of all the upstream services going into all 4 ports of the LBON4000. Refer to
Figure 8 to Calculate the Total Return RF level. To help with this calculation, or to set the levels
based on an equal power per Hertz basis, please visit
www.lindsaybroadbandinc.com
Resources Tab
for a spreadsheet calculator. The Total RF return level at the input to the laser
should be 34
– 50dBmv @ NPR=38dB. This can be checked at the Return test point (-20dB) at
the Return Transmitter.
Tip
plan for the additional RF power of future services when setting the optimum reverse input
level. Then the levels won’t have to be re-adjusted to avoid laser clipping when those services are
added later.
Figure 8
User Manual
LBON4000
LBON4000 April 2013
