approx. 30 minutes for equip-
ment to warm up and stabilize.
3
Connect sliding short to tuner
SWR meter indication "peaks ".
Defect within SWR meter.
Refer to SWR meter manual
no. 2 and adjust GAIN control
fully cw and VERNIER con-
Defect within PIN modulator.
Refer to PIN modulator manual.
trol fully ccw. Adjust RATE
control on modulator for maxi
Defect within modulator.
Refer to modulator manual.
mum SWR meter indication.
4
Turn all tuning stubs on both tu-
SWR meter indication "peaks".
Defect within tuners
Replace stub tuner.
ners ccw until they turn
freely. Adjust sliding short for
Defect within sliding short
Replace sliding short
maximum deflection to the
right.
Poor connection in test setup.
Locate and correct poor connect-
ion in test setup.
5
Set RANGE-DB switch on SWR
SWR meter indicates full scale
Defective level-set attenuator.
Replace level-set attenuator.
meter to 20, and adjust level-
(O DB).
set attenuator for full-scale
Defect within SWR meter.
Refer to SWR meter manual
deflection .(O DB) on SWE
meter.
6
Disconnect sliding short and re-
SWR meter indication on-scale.
Defect within SW R meter.
Refer to SWR meter manual
place it with sliding termina-
Replace sliding termination.
tion. Adjust RANGE-DB
Defect within sliding termination.
switch on SWR meter for an
on-scale reading.
7
Adjust sliding termination for
SWR meter indication "peaks".
Defect within sliding termination.
Replace sliding termination
maximum deflection to the
right on SWR meter scale. If
necessary, change RANGE-DB
switch setting to follow the
maximum.
8
Tune tuner no. 2 (tuner closest
Further adjustment has no effect
Defective tuner no. 2.
Replace tuner no. 2
to load) by adjusting stub
on meter indication.
which is closest to load for a
Poor connection in test setup.
Locate and correct poor connect-
minimum meter deflection
ion in test setup.
(maximum deviation to left)
on SWR meter scale while ad-
justing sliding termination for
maximum deflection on SWR
meter scale. If necessary, turn
RANGE-DB switch cw to fol-
low the minimum meter deflec-
tion. Repeat this step until ad-
justment has no further effect
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
3-17