TM 11-6625-2398-15-3
Dial
Attenuation in dB's
9-7. Insertion losses
setting
1030 MHz
1090 MHz
a. On the hybrid attenuator measure the insertion
loss between RF IN/OUT and RF SUM connectors and
3.0
1-6
2-4
the loss between the RF IN/OUT and ATTEN IN/RF DIFF
6.0
4-9
5-7
connectors. The insertion losses should be 6.541.5 dB.
9.0
7-12
8-10
12
10-15
10.9-13.1
NOTE
15
13-18
13.9-16.1
The hybrid attenuator control should
20
18-23
18.9-21.1
be set for minimum attenuation. Refer
25
23-28
23.8-26.2
to figures 8-3 and 8-4 for test
b. Check the actual dB value obtain in test a above
connections.
against the value listed on the calibration chart chained to
the handle of the hybrid attenuator (fig. 1-3). Make
b. The four RF leads of cable W1 should have a
corrections on the chart as necessary.
loss of 1.5 dB maximum. Refer to fig. 6-7.
9-9. VSWR of Hybrid Attenuator Connectors
c. The two RF leads of cable W3 should have a loss
of 1.5 dB maximum. Refer to fig. 6-9.
b. The chart below lists the hybrid connectors and
d. The loss of cables W14 and W15 should have a
gives the vswr that is acceptable.
loss of 2.0 dB maximum. Refer to fig. 6-15.
Connector
VSWR
9-8. Hybrid Attenuator
RF IN/OUT
less than 1.65 to 1
RF SUM
less than 1.2 to 1
8-5.
The chart below gives the hybrid attenuator
CPLR IN
less than 1.5 to 1
ATTENUATOR dial setting (fig. 1-3) and the minimum
ATTEN OUT
less than 1.5 to 1
and maximum insertion loss in dB's at 1030 MHz and
c. The overall vswr of the hybrid attenuator must be
1090 MHz.
less than 1.6 to 1.
9-2
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