|
| |
TM 11-5820-890-30-5
2-29. OPERATIONAL CHECK. Continued
Step 6. RF OUTPUT CHECK.
Action
a.
Connect RF probe to DMM and RF DET.
Set DMM to 50 W reference.
Set UUT RT:
RF:
HI
CHAN:
MAN
FCTN:
SQ ON
MODE:
SC.
b. Set PTT: UUT.
Set CHAN switch to each position.
c.
Observe SIG display.
d. Set UUT RT:
RF:
PA.
e. Set UUT RT:
RF:
M.
f.
Observe SIG display.
g. Set UUT RT:
RF:
LO.
h. Observe SIG display.
i.
Set UUT RT:
RF:
M.
Set RF SWITCH: 2.
2-36
Response
a.
No response.
b. DMM reading is 35 to 39 dBm for all
channels. If not, go to chart 15.
If RT display goes blank when PTT is set
to UUT, replace the exciter/power ampli-
fier (1A11) and repeat step 6 b.
If UUT passes step 6 b, the removed
exciter/power amplifier (1A11) is bad.
If UUT fails step 6 b, the power supply
(1A3) is bad.
c.
SIG display reading is 5, 6, or 7. If not,
go to chart 16.
d. DMM reading is 35 to 39 dBm. If not,
go to chart 42.
e.
DMM reading is 20 to 24 dBm. If not,
go to chart 17.
f.
SIG display reading is 2, 3, or 4. If not,
the display circuit card assembly
(1A16A1A1) is bad.
g.
DMM reading is -7 to +1 dBm. If not,
go to chart 18.
h. SIG display reading is 0 or 1. If not,
the display circuit card assembly
(1A16A1A1) is bad.
i.
No response.
|
