Selecting The Gain Control - Motorola Starline SG1000 Installation And Operation Manual

Before you begin:
Test the input power using an optical power meter to ensure that expected levels are
present.
Refer to Section 4, "Installation," Installing the Fiber Cables to verify that required
connections have been made to the bulkhead fitting.

Selecting the Gain Control

Thermal control circuitry provides thermal gain control that compensates for changes in gain
caused by temperature variations. The available gain reserve is factory-set for optimum
operation and is not field adjustable. You can however, set an internal jumper to disable
thermal gain control. This enables you to operate the station at full gain for applications that do
not require gain stabilization.
The gain-control jumper is factory-set to enable thermal gain control. If you want to reset the
jumper:
1
Loosen the chassis cover screws and remove the cover.
2
Position the jumper on the appropriate pins for the preferred gain control mode.
3
Replace the chassis cover and torque the screws to 15 to 17 in-lbs. Be careful that you do not
pinch the fibers between the chassis cover and chassis.
Figure 3-9 illustrates the gain control jumper and its location:
Figure 3-9
Gain control jumper
3 1
J104
FULL TC
OPTICAL
RETURN
POWER
INPUT JXP
TEST POINT
(1V/mW)
D A NG E R
RETURN INPUT
TEST POINT
ASSEMBLED
IN MEXICO
SG1000
Optical Transmitter
SG1000 Split Third Port Installation and Operation Manual
Setup and Operation 3-9