TM 11-6625-828-45
Control settings
Test equipment
Equipment under test
Test procedure
Performance standard
1
None
a. MC switch to A.
a. Check to see that crystals are
a. Trimmers should tune either side
plugged into A- and B-crystal-
of maximum.
holders and that the tabs above
the crystals agree with crystal
frequencies. Use a screwdriver
to adjust first plate A, then grid
A, trimmer capacitors for maxi-
mum RF meter indication.
b. MC switch to B.
b. Repeat a above for plate B and
b. Trimmers should tune either side
grid B trimmer capacitor.
of maximum.
2
AN/USM-26:
RF LEVEL SET control midway.
FUNCTION SWITCH:
MODULATION switch to EXT.
FREQUENCY
IDENTIFIER switch to OFF.
TIME BASE SWITCH:
a. MC switch to A
a. Use AN/USM-26 to measure fre-
a. Frequency should be within 0.005
1 SEC
quency of test set A crystal.
percent of indicated frequency
on tab.
b. MC switch to B.
b. Use AN/USM-26 to measure fre
b. Frequency should be within 0.005
quency of test set B crystal.
percent of indicated frequency
4-6
