V
IA
L
ITE
HD-B
LUE
2-L
INK
-H
ANDBOOK
-HRX-XX-8X-35-XXXXX
33
Change of link P1dB at temperature
3.17 RF isolation
ViaLiteHD cards are designed to offer excellent isolation in operation, both isolation between the
separate channels of dual modules and isolation from module to module in a chassis or enclosure
mounted system.
The RF components for each channel of a card are fitted within a metal shield that gives a high level
of isolation. Modules operating at 3GHz or more are fitted with an additional rear side shield that
gives improved high frequency isolation
3.17.1 RF isolation, Blue link and Yellow link cards mounted in other ViaLite enclosures
Other
ViaLiteHD
enclosures are designed to offer similar isolation. Below is a plot taken between
adjacent L-Band HTS modules in a SATCOM6 outdoor enclosure. The average isolation across the
L-Band HTS frequency range is ~70dB in a SATCOM6.
Test: Isolation between L-Band HTS TX in slot 3 and L-Band HTS TX in slot 4 of SATCOM6
Set up: Though gain is calibrated out, i.e. normal Uplink gain (~0dB for this system) is subtracted
from the measured results.
Sample isolation between adjacent modules in a SATCOM6
-6
-4
-2
0
2
4
6
-30
-20
-10
0
10
20
30
40
50
60
70
P
1
d
B
V
a
ri
a
ti
o
n
(d
B
)
Temp (degC)
950MHz
1200MHz
1700MHz
2150MHz