TM9-4935-294-15/2
RANGE-DB switch and GAIN
controls to keep meter reading
on-scale.
9
Adjust GAIN and VERNIER
SWR meter indicates LO (SWR).
Defect within SWR meter.
Refer to SWR meter manual.
controls on SWR meter for
full-scale deflection (1.0 SWR)
on SWR meter scale using a
20 DB or other suitable
RANGE-DB switch setting.
Do not change SWR meter
FREQ control settings or
BWO power supply SQUARE
WAVE FREQ control setting
during the remainder of this
procedure.
10
Rotate ANGLE OF REFLEC-
SWR meter indicated VSWR of
Defect within unit under test
Troubleshoot unit under test
TION COEFFICIENT probe
unit under test
VSWR too high)
knob on standing wave detec-
tor to obtain a minimum indi-
Defect within SWR meter.
Refer to SWR meter manual.
cation on SWR meter. Read
VSWR on the 1.0-4.0 SWR
Poor connection in test setup.
Locate and correct poor
scale. If VSWR reading is
connection in test setup.
above 3.2, rotate RANGE-DB
switch one position cw and
read VSWR on the 3.2 to 10
SWR scale. If VSWR is above
10, rotate RANGE-DB switch
one additional position cw and
read VSWR on 1.04.0 SWR
scale and multiply reading by 10
continue this process
still higher VSWR readings.
11
For VSWR readings below 1.24,
Defect within SWR meter.
Refer to SWR meter manual.
place EXPAND switch to 0
efficient in db of unit under test.
and read VSWR on the EX-
PAND SWR meter scale.
12
Convert DBreading to VSWR
VSWR of unit under t est is deter-
value using DB(SWR)to
mined from chart
VSWR conversion chart in
chapter 2, section III, of TM
9-4931-294-15/1.
3-23