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The following figures and tables define the allow-
able cable lengths between the LO source and
85309A LO/IF distribution unit, and between the
85309A and the mixers. Tables 6, 8, and 10 show
maximum cable lengths with standard 85301A/C
cables. Tables 7, 9, and 11 show maximum cable
lengths with MA/COM FA29RX low-loss cables.
Maximum cable lengths with 1 to 26.5 GHz mixers
The standard mixers used in Agilent antenna
measurement systems are the 85320A test mixer
and the 85320B reference mixer. Both mixers oper-
ate from 1 to 18 GHz in fundamental mode, and
from 6 to 26.5 GHz in third-harmonic mode. While
the 85320A/B mixers are not specified from 1 to
2 GHz, they will operate in this frequency range
with degraded sensitivity. Figure 9 shows the RF
power
Table 6. 85381A cable lengths with 85320A/B mixers
Maximum LO Frequency
Maximum cable length (L1,meters)
bands (GHz)
LO source to 85309A
18
5 (5)
1
12.4
7 (6.2)
9
10 (7.4)
6
13 (9.2)
3.6
27 (11.5)
Table 7. Special low-loss cable lengths with 85320A/B mixers, and MA/COM FA29RX cable
Maximum LO Frequency
Maximum cable length (L1,meters)
bands (GHz)
LO source to 85309A
18
10 (10)
12.4
12 (13)
9
15 (15)
6
20 (19)
1. Maximum cable lengths with special high-powered 85309A-H30, H31, H32 units.
Maximum cable length (L2,meters)
85309A to 85320A/B
7 (12)
1
9 (15.3)
1
12 (18)
1
15 (22.5)
1
29 (28)
Maximum cable length (L2,meters)
85309A to 85320A/B
1
15 (25.9)
1
19 (32)
1
24 (38)
1
31 (47)
levels required for proper operation with the
85320A/B mixers. Table 6 shows the maximum
allowed 85381A/C cable lengths from the LO source
to the 85309A, and from the 85309A to the 85320A/B
test and reference mixer modules. Table 7 shows
the maximum cable lengths with special low-loss
cables.
83620B
Synthesized Source
P Out = 13 dBm
Cable Length L1
*Minimum specified leveled power; 2-9 GHz, P Out = 20.4 dBm; 9-18 GHz, P Out = 19 dBm.
Figure 9. Required RF power levels for 85320A/B mixers
1
1
1
1
1
1
1
1
1
P Out = 19 dBm*
85309A LO/IF
Distribution Unit
Cable Length L2
P Out = 19 dBm*
P
= 0-5 dBm
In
Cable Length L2
Operating bands
1 to 18 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 12.4 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 9 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 6 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 3.6 GHz fundamental
3.6 to 18 GHz 5th harmonic
Operating bands
1 to 18 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 12.4 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 9 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 6 GHz fundamental
6 to 26.5 GHz 3rd harmonic
85320B
Reference
Mixer
P
= 7.5 dBm
In
85320A
Test Mixer
P In = 7.5 dBm
15
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