Table 3-7-Continued
Step
Procedure
Normal indication
Possible cause of malfunction
Corrective measure
scribed in 8 above. Proceed
meter scale.
Poor- connection .n test setup.
Locate and correct poor connect-
with each succeeding stub on
ion 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 posi-
On-scale indication on SWR meter.
Defect within SWR meter
Refer to SWR meter manual.
tion producing an on-scale
meter reading.
11
Repeat 7 through 10 above until
Variation of indication on SWR
Defect within tuner no. 2
Replace tuner no. 2.
SWR meter variations on EX-
meter of 9.?5 db or less.
PAND scale are 0.75 db or
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
Tune tuner no. 1 (tuner closest
SWR meter indication is mini-
Defective sliding short.
Replace sliding short.
to signal source) by readjust-
mized.
ing sliding short for minimum
deflection (maximum deviation
to the left) on SWR meter
scale.
15
Adjust stub closest to the load to
SWR meter indication. is reduced
Defect within tuner no.
Replace tune- no.1.
reduce, the meter deflection.,
to one-half of its value.
caused by the adjustment of
the sliding short to one-ha!f of
its value.
Replace ,sliding short.
16
Adjust sliding short for maxi-
1SWP meter indication is mini
Defective sliding shorts
mum deviation (maximum de-
mized.
flection to the left) on SWR
meter scale.
3-18