Comtech EF Data OAC-170D, Быстрый старт

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OAC-170D 70 MHZ AMPLIFIER ADJUSTMENT
The OAC-170D Amplifier Adjustment is performed to ensure that the total gain from the
Downconverters to the input of the CS6716 is set for 40db +/- .25db. The OAC-170D
provides the necessary gain between the downconverter outputs and the CS6716 digital
troposcatter modem inputs via four 16db adjustable IF amplifiers.
NOTE: This procedure is not normally required in the field; however, it should be
performed after the replacement of any major equipment in the receive chain. LNA,
downconverter, IF Test Panel and/or any associated cables in the receive path.
STEP 1
Set the CS6716 modem to Default Configuration and place Modem to Online state:
a. On the modem front panel keypad, select ENT for Main Menu then select
ON/OFFLINE, then select OFFLINE to place the modem in the offline state.
b. From the Main Menu select CONFIG, then select DEFAULT to set the modem to
default configuration.
c. From the Main Menu select ON/OFFLINE, and then select ONLINE to place the
modem into the online state.
STEP 2
Remove all of the U links from the IF Data Patch Panel as shown in Fig 1.1.
Figure 1.1