Comtech EF Data LNAS, Installation And Operation Manual

Page: 27 / 30

Low Noise Amplifier Series
Revision 2
Redundancy 5–1 MN-LNAS
Chapter 5. REDUNDANCY
5.1 Typical System Noise Temperature
5.1.1 1:1 Redundant LNA System
T
system
= T
LNA
+ T
SWITCH
+ T
OPTION 3
+ T
OPTION 1
5.1.2 1:2 Redundant LNA System
RF Input 1:LNA online signal path
T
system
= T
LNA
+ T
SWITCH
+ T
OPTION 3
+ T
OPTION 1
RF Input 1:LNA 3 online signal path (LNA 1 Standby)
T
system
= T
LNA
+ 2*T
SWITCH
+ T
W2
+ T
OPTION 3
+ T
OPTION 1
RF Input 2:LNA 2 online signal path
T
system
= T
LNA
= T
W1
+T
SWITCH
+ T
OPTION 3
+ T
OPTION 1
RF Input 1:LNA 3 online signal path (LNA 2 Standby)
T
system
= T
LNA
+ 2*T
SWITCH
+ T
W1
+ T
W2
+ T
OPTION 3
+ T
OPTION 1
Table 5-1. Typical Noise Temperature in Kelvin at 23°C
Band (GHz) 3.62 to 4.205 3.4 to 4.2 10.7 to 12.75 Ka-Band
Item WR229 WR229 WR75 WR42
TSWITCH 1.50 1.50 3.50 10.00
TW1 1.50 1.50 4.00 7.00
TW2 1.50 1.50 4.00 7.00
TOPTION1 0.50 0.50 2.00 10.00
TOPTION3 2.40 7.00 7.00 NA