Comtech EF Data MIDAS Version 4.X NMS Configuration - Manual (Page 36)

MIDAS 4.X NMS Configuration, Rev.6
2–8 Setup and Operation
The System Setup window allows the operator to enter the Transponder name,
select its size (36, 54, 72 MHz), and set the following:
Frequency Band Select the frequency band, C- or Ku-Band. For C-Band, high-side injection is the default. For Ku-Band, low-side
injection is the default.
High-side injection is calculated as follows:
LBand = Uplink Factor – RF Uplink
- or -
L-band = Downlink Factor – RF Downlink
Low-side injection is calculated as follows:
L-band = RF Uplink – Uplink Factor
- or -
L-band = RF Downlink – Downlink Factor
Uplink Factor Enter the value (in GHz) for the Uplink Factor to be used for low- or high-side injection calculations.
Downlink Factor Enter the value (in GHz) for the Downlink Factor to be used for low- or high-side injection calculations.
Downlink Factor = Uplink Factor – Translation Factor
Translation Enter the value (in GHz) for the Translation Factor to be used for low- or high-side injection calculations.
Translation Factor = RF Uplink – RF Downlink
High Side Injection Click the checkbox to select high-side injection.
IF Center This is the IF Center frequency of the transponder, depending on the specific hardware involved, 70 or 140
MHz.
C C a a u u t t i i o o n n ! ! The Step Size and IF Center values shall be changed only when configuring the system for the
first time, or if a substantial system reconfiguration is required. Changing these values requires a
system reset (reboot), and will cause the loss of key bandwidth related information. Additionally, all
Active Calls will be deleted.
After the system is restarted, the Space Segment and Control Channels shall be reconfigured.
This section of the System Setup window allows the operator to enter the Transponder name, select its size (36, 54, or 72 MHz), and set the following:
TX Center
Enter the TX Center frequency of the Transponder. Valid ranges:
C-band = 5.85 to 8 GHz
Ku-band = 12 to 14.5 GHz
RX Center
Enter the RX Center frequency of the Transponder. Valid ranges:
C-band = 3 to 5 GHz
Ku-band = 10 to 12.75 GHz
L-Band This is the L-Band Center frequency of the Transponder. This field is not configurable. MIDAS will calculate,
based upon the difference between the Downlink factor and RX Center.
Acceptable values include 950 to 1750 (in accordance with the L-band Center and Transponder Size settings
on the System Setup window), to accommodate the operating frequency ranges of the full spectrum of satellite
transponders and Comtech EF Data hardware capabilities.
L-Band = 950 to 1750 MHz