Cisco Cisco 1 GHz GainMaker Amplifier Guida All'Installazione
Balancing the Forward Path
57
Note: On the High Gain Dual, the type of plug-in signal director installed directly
affects the signal level measured at the Aux RF output test points. This is because
the Aux RF output test points are located after the signal director in the forward RF
signal path. The test points now reflect the actual output of the port.
It is important to determine if the Aux output level specified on the design print is
the level before or after the signal director.
affects the signal level measured at the Aux RF output test points. This is because
the Aux RF output test points are located after the signal director in the forward RF
signal path. The test points now reflect the actual output of the port.
It is important to determine if the Aux output level specified on the design print is
the level before or after the signal director.
If it is the level after the signal director (port output level), the test point
should match the print design level.
should match the print design level.
If it is the level before the signal director, the test point level should be “x” dB
lower than the print design level, where “x” is the insertion loss of the signal
director feeding the particular Aux port being balanced.
lower than the print design level, where “x” is the insertion loss of the signal
director feeding the particular Aux port being balanced.
5 Proceed to the next section, To Set Up Automatic Gain Control.
To Set Up Automatic Gain Control
This section provides procedures and tables for configuring and aligning the AGC in
the 1.2 GHz GainMaker System Amplifier. AGC attenuator values are required to
select the proper AGC attenuator value based upon actual AGC pilot carrier output
level. See To Select the AGC Pad Value.
the 1.2 GHz GainMaker System Amplifier. AGC attenuator values are required to
select the proper AGC attenuator value based upon actual AGC pilot carrier output
level. See To Select the AGC Pad Value.
Note:
Output levels are measured at the pilot frequency.
The standard single-pilot AGC makes amplifier output adjustments based on the
level of the pilot frequency carrier. Activate the pilot carrier with its final
unscrambled video source before beginning balance and alignment.
level of the pilot frequency carrier. Activate the pilot carrier with its final
unscrambled video source before beginning balance and alignment.