Olson Technology OT-1000-HH Rev.X2 - Manual (Page 20)

025-010573 Rev. X2 - 20 - www.olsontech.com
Setting the RF Gain Limit (AGC-On Mode only)
The picture below shows how to adjust the maximum RF gain in AGC-On mode.
Figure 19 — Setting Maximum RF Gain
The RF gain (maximum) limit is useful, if a certain OMI per channel should not be exceeded. This typi-
cally is required if the RF load is going to be increased later. At the beginning with weaker RF load
(lower number of TV carriers) the AGC tries to compensate the weaker RF load with an increased gain.
If the difference between the initial channel load and the final channel load is e.g. 6dB, the AGC will
start at the initial channel load at a 6dB higher OMI than with the final channel load. As a consequence, a
fiber node and all subsequent RF amplifiers have to handle this 6dB OMI-change too. With the RF gain
limit function the change in OMI can be limited.
Certain combinations of optical output power and OMI maximum RF Gain settings can be physically
unreachable. In this case the web page marks the RF Gain limit setting “value out of range” as can be
seen in the figure below.
Figure 20 — Setting Maximum RF Gain: Value out of range