TM 11-6625-2398-15-3
SWR scale (top) of the SWR indicator meter. The
Cable W14/W15 (1)
meter must indicate less than 1.65 on the SWR scale.
(10) Terminate and connect the hybrid attenuator
NOTE
as directed in B of figure 6-5 (RF SUM jack VSWR).
Connect the test equipment as shown in solid
lines of figure 6-6.
(11) Repeat steps (4) through (9). SWR indicator
meter must indicate less than 1.2 on the SWR scale.
b. Procedure for Cables W14/ W15.
(12) Terminate and connect the .hybrid attenuator
(1) On the signal generator, set the
as directed in C of figure 6-5 (CPLR IN jack VSWR).
MEGACYCLES; dial to 1030 with the frequency control
knob. Set the function switch to 1000~, the MOD. UP-
(13) Repeat steps (4) through (9). SWR indicator
NORMAL-DOWN to NORMAL, and the attenuator to
meter must indicate less than 1.5 on the SWR scale.
0dB (outer scale). Turn on the signal generator and
allow a minimum of 20 minutes warm-up period before
(14) Terminate and connect the hybrid attenuator
proceeding. Adjust the MOD LEVEL, control for a
as directed in D of figure 6-5 (ATTEN OUT jack VSWR).
reading of 50 on the PERCENT MODULATION meter.
Set ATTENUATOR control to 0 (zero).
(2) With the METER SCALE set to EXPAND, and
(15) Repeat steps (4) through (9). SWR indicator
the INPUT SELECTOR set to XTAL-200KΩ, turn on the
meter must indicate less than 1.5 on the SWR scale.
SWR indicator and allow a minimum of 10 minutes
warm-up period before proceeding.
(16) Terminate and connect the hybrid attenuator
as directed in E of figure 6-5 (hybrid attenuator VSWR).
(3) Adjust the VERNIER GAIN control and the
Set ATTENUATOR control to 0 (zero).
RANGE switch for a reading of 0 (zero) on the
EXPANDED DB scale of the SWR indicator meter.
(17) Repeat steps (4) through (9). Standing wave
ratio indicator must indicate less than 1.6 on the SWR
(4) Connect the unused W14/W15 cable as shown
scale.
with broken lines in figure 6-6.
6-12. Calibration of Insertion loss for Cables
(5) Read insertion loss on the EXPANDED DB
W14/W11 and W39
scale of the SWR indicator meter, reading must not
exceed 2.5. Replace or repair (para 7-7) the cable if the
insertion loss exceeds 2.5dB.
a. Test Equipment and Materials. The following test
equipment and materials are required:
(6) Compare insertion loss with 1030MHz insertion
loss marking on cable sleeve. Change the marking (by
Signal Generator SG-340/G
scraping off ink and remarking with India ink) if
measured insertion loss exceeds +0.2dB of marked
SWR Indicator AN/UPM-108A
insertion loss.
Adapter UG-606/U
(7) Reconnect the test equipment as shown with
solid lines in figure 6-6 and set the MEGACYCLES dial
Adapter UG-914/U
of the signal generator to 1090MHz.
Adapter CP7/CP8 (2)
(8) Repeat steps (3) through (6) except compare
insertion loss with sleeve marking for 1090MHz.
(9) Substitute the calibrated W14/W15 cable
6-14
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