Installation and Setup
B
GX2 EA1000C*/* Multi-Wavelength DWDM 1550 nm Laser Transmitter
•
User Guide
26
589569-001-a
Measuring and Checking the RF Input Signal Levels
Following verification of the optical output power, you need to confirm the levels of the
RF input signal being applied to the GX2-EA1000C*/*.
To measure and check the RF input signal levels:
1.
Verify that the GX2-EA1000C*/* is correctly seated in the GX2-HSG* and that power
has been applied for at least five minutes.
2.
Before you connect the input cable to the main (broadcast) input or secondary
(narrowcast) input on the GX2-HSG* rear panel, use a signal level meter, RF power
meter, or a spectrum analyzer to measure the RF input signal level.
3.
Compare the RF input signal level to the specified RF input level noted in Appendix
A, “Specifications.” It may be necessary to adjust the RF input-per-channel level to
be within the noted specification.
4.
You can calculate this level based on the equation: 10 x log
10
(ratio of channels).
Avoid varying from the nominal input, as higher levels cause degraded distortion
performance and lower levels can approach the AGC range limit and add additional
noise to the link.
Reminder—the gain of the narrowcast RF input port is 6 dB less than the broadcast RF
input port.
5.
After you correctly set the RF signal level, connect the corresponding RF cable to the
preferred RF input port G- to F-type connector (broadcast and/or narrowcast) on the
rear of the GX2-HSG*. Confirm that it is connected to the slot occupied by the GX2-
EA1000C*/*.
6.
Install a 75-ohm terminator on any unused RF input ports. A 75-ohm terminator is
provided with the GX2-EA1000C*/*.
