Table 3-6--Continued
Step
Procedure
Normal indication
Possible cause of malfunction
Corrective measure
9
Adjust next stub in tuner no. 2
Further adjustment results in a
Defect within tuner no. 2.
Replace tuner no. 2.
for meter indication as de-
change of less than 1 db on
scribed in 8 above. Proceed
meter scale.
Poor connection in test setup.
Locate and correct poor connec-
with each succeeding stub on
tion in test setup.
tuner no. 2 until adjustment
results in a change of less
than 1 db on meter scale.
10
Turn EXPAND switch to position
On-scale indication on SWR meter.
Defect within SWR meter.
Refer to SWR meter manual.
producing an on-scale meter
reading.
11
Repeat 7 through 10 above until
Variations of readings on SWR
Defect within tuner no. 2.
Replace tuner no. 2.
SWR meter variations on EX-
meter of 0.75 db or less.
PAND scale are 0.75 db or less
Poor connection in test setup.
Locate and correct poor connect-
as sliding load is moved, or
ion in test setup.
SWR meter indication falls
into noise level. Secure tuner
no. 2 in this position. Turn
EXPAND switch to NORM
and RANGE-DB switch to 20.
12
Disconnect sliding termination
SWR meter indication on-scale.
Defect within SWR meter.
Refer to SWR meter manual.
from test setup and replace it
with sliding short. Adjust
GAIN and VERNIER controls
and, if necessary, RANGE-DB
switch on SWR meter for an
on-scale reading.
13
Adjust sliding short for maxi-
SWR meter indication "peaks".
Defective sliding short.
Replace sliding short.
mum deflection to the right on
SWR meter scale. Record indi-
cation.
14
Readjust sliding short for mini-
SWR meter indication is mini-
mum deflection (maximum de-
mized.
viation to the left) on SWR
meter scale.
15
Tune tuner no. 1 (tuner closest
SWR meter indication is reduced
Defective sliding short.
Replace sliding short.
to signal source) by first ad-
to one-half of its value.
justing stub closest to the load
Defect within tuner no. 1.
Replace tuner no. 1.
to reduce the meter deflection
caused by the adjustment of
the sliding short to one-half of
its value.
16
Adjust sliding short for maxi-
SWR meter indication is mini-
Defective sliding short. Replace sliding short.
3-14