Pre-Installation Requirements
Verify Tx/Rx Path Gain Budgets
OceanTRx
TM
4-500 Installation and Operations Manual
3-21
Figure
3-18: Calculations for Example of Dual OceanTRx4-500 L-Band Tx Path
Parameter
Unit
Value
System1 Type
N/A
OTRx4
System1 Band
N/A
Ku
System2 Type
N/A
OTRx4
System2 Band
N/A
Ku
POINT
G
BUC Power
Watts
16.0
G
BUC Power (P1dB)
dBm
42.0
BUC Gain (Nominal)
dB
70.0
BUC Internal Attenuation
dB
0.0
F
Derived Input power to BUC for P1dB
dBm
-28.0
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
-20.2
A
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
CCU1U
BDMx Tx Attenuation Selector (0dB or -15dB)
dB
0
CCU1U
ADMx/BDMx Total Gain (Tx path)
dB
19
CCU1U
Standard CCU Losses
dB
-4.0
DSS
Standard Dual System Selector Switch Box Losses
dB
-5.0
Derived Total ADE to BDE LMR Cable Gain/loss (according to length) with Standard CCU and DSS
dB
-9.2
A
Derived L-Band (Tx) Output from Modem for BUC P1dB (System1)
dBm
-18.7
g
BUC Power
Watts
20.0
g
BUC Power (P1dB)
dBm
43.0
BUC Gain (Nominal)
dB
70.0
BUC Internal Attenuation
dB
0.0
f
Derived Input power to BUC for P1dB
dBm
-27.0
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
-19.2
A
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
100.0
b to c
Derived Cable Attenuation (according to length and LMR Type 400 or 600)
dB
-21.7
DSS
BDMx Tx Attenuation Selector (0dB or -15dB)
dB
0
DSS
ADMx/BDMx Total Gain (Tx path)
dB
19
DSS
DSS Standard CCU Losses
dB
-4.0
DSS
Standard Dual System Selector Switch Box Losses
dB
-5.0
Derived Total ADE to BDE LMR Cable Gain/loss (according to length) with Standard CCU and DSS
dB
-19.5
A
Derived L-Band (Tx) Output from Modem for BUC P1dB (System2)
dBm
-7.5
Dual OceanTRx4-Total Tx level Budget (L-Band from Modem)
