TB 9-6625-2094-24
(7) Adjust OUTPUT step attenuator to 0 dBm.
(8) Alternately adjust OUTPUT VERNIER control for a +3 and -6 dBm reading on
TI OUTPUT meter while adjusting meter board POT C (fig. 2) for +3 dBm and POT D
for -6 dBm indications on the measuring receiver. Repeat the above until no further
adjustments are required (R).
11. Output Level Flatness
a. Performance Check
(1) Position controls as listed in (a) through (e) below:
FREQUENCY VERNIER control to CAL.
(a)
Set FREQUENCY switches to indicate 050.000 MHz.
(b)
MODULATION MODE switch to CW.
(c)
OUTPUT step attenuator control to -10 dBm.
(d)
OUTPUT VERNIER control for a -7 dB indication on measuring receiver.
(e)
NOTE
Do not change OUTPUT VERNIER control setting after this
point.
(2) Set measuring receiver to ratio mode and adjust TI FREQUENCY switches from
010.000 MHz to 500.000 MHz. Measuring receiver indication will stay between -.75 and
+.75 dB over the entire range.
(3) Take measuring receiver out of ratio mode.
(4) Position controls as listed in (a) through (e) below:
FREQUENCY VERNIER control to CAL.
(a)
Set FREQUENCY switches to indicate 050.000 MHz.
(b)
MODULATION MODE switch to CW.
(c)
OUTPUT step attenuator control to 0 dBm.
(d)
OUTPUT VERNIER control for a -1 dB indication on measuring receiver.
(e)
NOTE
Do not change OUTPUT VERNIER control setting after this
point.
(5) Set measurement receiver to ratio mode and adjust TI FREQUENCY switches
from 010.00 MHz to 500.00 MHz. Measuring receiver indication will stay between -.75 to
+.75 dB over the entire range.
(6) Take measuring receiver out of ratio mode.