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Agilent 85381 series coaxial cables
The 85381A microwave cable is a semi-flexible
cable that operates from DC to 18 GHz. It is
intended for use as an LO cable between the LO
source and the 85309A LO/IF unit (see Figure 11).
If a rotary joint is used to route the test LO and IF
signals so that the cable is not continuously flexed,
the 85381A cable can be used between the 85309A
and the 85320A/B test and reference mixers. The
maximum orderable length for this cable is 25
meters. (See Figure 18, cables B3, B4 and B5.)
Refer to Figure 12 for cable loss characteristics.
The 85381C microwave cable is a flexible cable
that operates from DC to 26.5 GHz. It is intended
for use as a transmit site RF cable, and to connect
the output of the AUT to the mixer modules when
direct connection is not possible. The 85381C can
also be used as a flexible LO cable in non-rotary
joint applications where the 85381A proves unsuit-
able (see cable B2 in Figure 18). Maximum order-
able cable length is 30 meters.
The 85381D cable is a flexible microwave cable
that operates from DC to 50 GHz. It is intended for
use in 50 GHz systems. It is used to connect the
transmit source to the source antenna, and on the
AUT side of the antenna range to connect the AUT
to the 50 GHz test mixer. Maximum orderable cable
length is 10 meters. This cable has significantly
higher loss than the 85381A/C cables, and should
only be used when 50 GHz capability is required.
Refer to Figure 13 for cable loss characteristics.
The 85382A cable is a low-frequency (<100 MHz)
flexible cable. It is used to carry the 20 MHz signal
from the 85309A frequency converter to the 8530A
microwave receiver. This cable is also used to tie
the 10 MHz time bases of the RF and LO sources
together in applications where this is practical.
This cable can be ordered in lengths up to 200
meters.
18
2.0
1.5
1.0
0.5
0
0
5
10
Frequency (GHz)
Figure 12. Insertion loss for 85381 series cables
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
85381A
18 GHz
1.5
1.0
.5
0
0
5
10
15
20
Frequency (GHz)
Figure 13. 85381A/C/D cables; typical insertion loss
0.61
0.46
85381A
85381C
0.30
MA/COM FA29RX
0.15
0
15
20
25
1.79
1.64
85381D
50 GHz
1.53
1.38
1.23
1.07
0.91
0.76
0.61
85381C
26.5 GHz
0.46
0.30
0.15
0
25
30
35
40
45
50
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