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Rotary joints
When a rotary joint is used, the equivalent cable
length must be added to the reference mixer LO
cable due to the rotary joint insertion loss. To
determine the equivalent cable length, first deter-
mine the insertion loss from the input to the output
of the rotary joint at the maximum LO frequency.
17
Record this value in Figure 18. Then use
Figure 12 or 13 to calculate the equivalent length
in meters at the maximum LO frequency using the
same cable type used for the LO cables between
the 85309A and the mixer modules. The reference
LO cable length must be increased by this amount.
18
Record the lengths and type of the LO cables
(B1 through B5) in Figure 18.
19
Record the lengths and type of the IF and lev-
eling cables (C1 through C5) in Figure 18.
Normally, 85382A cable is used.
20
In Figure 16, record the connector types of the
system components.
The semi-flexible 85381A cable is normally used
for cables B1, B3, B4, and B5. The flexible 85381C
cable is normally used for cables B2 and B5. The
85382A cable is normally used for cables C1, C2,
C3, C4, and C5.
20
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