Orbit OCEANTRX4-500 - Page 44

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)