Orbit OCEANTRX4-500 - Page 46

Verify Tx/Rx Path Gain Budgets Pre-Installation Requirements
3-18 Ocean TRx™ 4500 Installation and Operations Manual
Example of L-Band Rx Levels calculations:
 LMR-600 cable length = 50m
 LNB Gain = 63dB
 Rx Ku-Band = 11.2GHz
 CCU "BDMx" attenuation = "0"dB
 Satellite EIRP = 39 dBW
 Transponder Bandwidth = 36MHz
 Used Bandwidth = 1MHz
Result of this example:
 LNB Output power = -51.1dBm
 Derived Rx L-Band Level received in the modem = -40.9dBm.
Figure 3-16: Calculations for Example of Single OceanTRx4-500 L-Band Rx Path
Parameter Unit Value
System Type N/A OTRx4
System Band N/A Ku
Transponder Saturation EIRP dBW 39.0
Output Backoff dB 4.0
Transponder Bandwidth MHz 36.0
Terminal Used Bandwidth (Rx) MHz 1.0
Downlink Frequency GHz 11.20
OTRx4 Antenna Gain (Typical) dBi 41.0
LNB Gain (Typical) dB 63.0
Derived Fractional Used Bandwidth dB -15.6
Derived Downlink Path Loss dB 204.5
dBW to dBm conversion factor dB 30.0
LNB Output Power dBm -51.1
POINT
G Derived LNB Output Power (H15), depends on Satellite EIRP, BW,Ant. Gain, etc, dBm -51.1
F to E, D to C Total Pedestal Attenuations: Cables (L-Band cables) + Rotary Joint + Splitter dB -14
C Derived Output Level Rx from Pedestal dBm -65.1
G Rx C-Band Frequency MHz 11200
LNB LO Frequency (Inverted) MHz 10000
Rx L Band Frequency MHz 1200
Which LMR Cable Type ? (400 or 600) 600
C to B ADE to BDE LMR Cable length Meter 50.0
C to B Derived Cable Attenuation (according to length and LMR Type 400 or 600) dB -4.8
BDMx Tx Attenuation Selector (0dB or -8dB) dB 0
ADMx/BDMx Total Gain (Rx path) dB 30.0
Standard CCU Losses dB -1.0
Derived Total ADE to BDE Gain/Loss (according to length) with Standard CCU dB 10.2
A Derived L-Band (Rx) Input to Modem with Standard CCU dBm -40.9
OceanTRx4 -Total Rx level Budget (L-Band from LNB to Modem)