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position in the bottom line of the display. Press “ENTER”. The display will show the
Converter Settings Subscreen for that chain position as shown below.
•
Upon entering a Converter Settings Subscreen, up and down arrows appear at the
leftmost part of the display. All Converter Settings Subscreens can be accessed by
using the up and down arrows to scroll through the list.
•
From within a Converter Settings Subscreen press “C” once to get back to subscreen
navigation. Press “C” again to exit the Converter Settings Subscreen and return to
the Redundancy Chain Status screen.
•
The converter settings can be changed from the Converter Settings Subscreen. Any
changes made to converters that are being polled will be sent to that converter from
this screen. For those converters with the NSU-Converter Serial Link enabled, the
polling activity will keep the NSU and the converter synchronized.
•
The following settings can be accessed from the Converter Settings Subscreen and
are updated by polling activity: RF Frequency, IF Frequency and Attenuation. In
order to make changes to the converter settings the NSU Control Unit must be in
Local control mode. For changes to be accepted by a converter being polled, that
converter must be in Remote control mode. If a unit with the NSU-Converter Serial
Link enabled is not in Remote control mode, the operator cannot change RF
Frequency, IF Frequency or Attenuation.
•
Polarization, Gain Equalization, Slope and Priority settings can be accessed in the
Converter Settings Subscreen. These settings do not affect the primary converter
and are stored in the NSU only.
RF: RF Frequency
To re-tune the RF Frequency of the selected converter:
•
Press the left or right arrow key to select the RF Frequency field on the display.
•
Use the numeric data entry keys to enter the desired frequency in MHz.
•
Press “ENTER” to save the RF Frequency in the NSU.
•
If the NSU-Converter Serial Link is enabled for the selected converter the NSU will
attempt to tune the selected converter to the desired frequency. If the NSU cannot
tune the converter an error tone is generated and the entry is revoked.
Note: For block converters store the translation frequency in the NSU.
IF: IF Frequency
The NSU Control Unit is intended to work with earlier equipment as well as the latest
MITEQ frequency converter products. Some products are not equipped with selectable
IF frequencies. For these units the IF Frequency information is for display purposes
only. To select the IF Frequency of a unit that is equipped with switchable IF:
•
Press the left or right arrow key to select the IF Frequency field on the display.
•
Use the up and down arrow keys to select the IF Frequency on the display.
•
Press “ENTER” to save the IF Frequency in the NSU.
•
If the NSU-Converter Serial Link is enabled for the selected converter the NSU will
attempt to set the selected converter to the desired IF frequency. If the NSU
cannot set the converter to the new IF frequency an error tone is generated and
the entry will be revoked.
PRI: Priority
To change the Priority of the selected converter:
•
Press the left or right arrow key to select the Priority field on the display.
•
Use the up and down arrow keys or the numeric entry keys to enter the desired
Priority.
•
Press “ENTER” to save the Priority in the NSU. If the priority is set a value greater
than 12, an error tone is generated and the entry will be revoked.