R
R
F
F
-
-
8
8
0
0
0
0
0
0
E
E
M
M
i
i
c
c
r
r
o
o
w
w
a
a
v
v
e
e
R
R
F
F
R
R
e
e
p
p
e
e
a
a
t
t
e
e
r
r
RF-8000E Operations Manual
Chapter 3. Mounting the Antennas — 49
Figure 25, Antenna Isolation Measurement - Equipment Configuration
NOTE: In all cases, measure antenna isolation with all feedlines, jumpers, cables, and connectors in
place. Record all measurements for future reference.
The equation for antenna isolation measurement is:
ISO = P
GEN
– (L
C-GEN
+ L
C-SA
) - P
SA
Where:
ISO
= Isolation in dB between the antennas.
P
GEN
= Output level of the signal generator (dBm).
L
C-GEN
= Loss of the signal generator cable, CA
SG
(dB).
L
C-SA
= Loss of the spectrum analyzer cable, CA
SA
(dB).
P
SA
= Power indicated on the spectrum analyzer (dBm).
For example:
P
GEN
= 10 dBm
L
C-GEN
= 1.0 dB
L
C-SA
= 1.0 dB
P
SA
= -92 dBm
ISO
= 10 dBm – (1 dB + 1 dB) – (-92 dBm) = 100 dB