Verify Tx/Rx Path Gain Budgets
Pre-Installation Requirements
3-16
Ocean TRx™ 4500 Installation and Operations Manual
Tx Modem
LMR 600 50m
RJ
ADMx
L Band
MUX Band
MUX
Band
L Band
A
B
C
D
E
F
Att -12dB
Gain 70dB
RF Band
G
CCU1U
20W BUC
BDMx
(Atten = 0db)
MUX Band
L Band
-15dBm
1200MHz
-10.8dBm
PEDESTAL
43dBm (20W)
(Loss = -11.4dB)
Figure
3-13: Example of Single OceanTRx4-500 L-Band Tx Path
Figure
3-14: Calculations for Example of Single OceanTRx4-500 L-Band Tx Path
Parameter
Unit
Value
System Type
N/A
OTRx4
System Band
N/A
Ku
POINT
G
BUC Power
Watts
20.0
G
BUC Power (P1dB)
dBm
43.0
BUC Gain (Nominal)
dB
70.0
BUC Internal Attenuation
dB
-12.0
F
Derived Input power to BUC for P1dB
dBm
-15.0
C to D, E to F
Total Pedestal Attenuations: Cables (L-Band cables and Mux cable) + Rotary Joint
dB
-7.8
C
Derived Input power to Pedestal for BUC P1dB (Mux)
dBm
-7.2
Tx L Band Frequency from MODEM
MHz
1200
C
MUX Band - Tx Frequency (@ Multiplexed highest frequency)
MHz
4500
Which LMR Cable Type ? (400 or 600)
600
B to C
ADE to BDE LMR Cable length
Meter
50.0
B to C
Derived Cable Attenuation (according to length and LMR Type 400 or 600)
dB
-11.4
BDMx Tx Attenuation Selector (0dB or -15dB)
dB
0
ADMx/BDMx Total Gain (Tx path)
dB
19
Standard CCU Losses
dB
-4.0
Derived Total ADE to BDE LMR-600 Cable Gain/loss (according to length) with Standard CCU dB
-4.2
A
Derived L-Band (Tx) Output from Modem for BUC P1dB with Standard CCU
dBm
-10.8
OceanTRx4-Total Tx level Budget (L-Band from Modem)
