Pre-Installation Requirements
Verify Tx/Rx Path Gain Budgets
OceanTRx
TM
4-500 Installation and Operations Manual
3-15
3.7.1
OceanTRx4-500 Single System Configuration
3.7.1.1
Single System L-Band Tx Levels
The calculation of the Tx L-Band path takes into consideration all Losses & Gains of the
OceanTRx4-500™ system: CCU losses, Attenuation Set-Up in the CCU, LMR Cable loss
(according to the length and type), Cables / RJ losses in the pedestal, BUC Power, BUC
internal attenuation Set-Up, BUC Gain, ADMx / BDMx Tx Path Total Gain.
Tx Modem
LMR
RJ
ADMx
L Band
MUX Band
MUX
Band
L Band
A
B
C
D
E
F
Attenuation
Gain
RF
Band
G
CCU1U
BUC
BDMx
MUX
Band
L Band
Figure
3-12: Single OceanTRx4-500 L-Band Tx Path
Example of L-Band Tx Levels calculations:
NOTE: Refer to the following figures.
In the example, the OceanTRx4 system is connected to the CCU via LMR-600 cable length
of 50m; BUC power = 20W, BUC gain = 70dB, internal attenuation = -12dB.
Derived powers for BUC P1dB:
Input power to BUC = -15dBm
Input power to Pedestal = -7.2dBm
Tx L-Band = 1200MHz
CCU "BDMx" attenuation = "0"dB
LMR cable Loss = -11.4dB
In this example, the derived modem Tx L-Band Level for P1dB of BUC is:
-10.8dBm.
