Test Connection and Conditions-cont.

(2) center fre-

(2) Add the frequency noted in c and

1,090

quency:

l above, l and divide by 2. This

0.5 mc.

is the receiver center frequency.

a. None.

a. Adjust the AN/URM-64A frequency to

4 . . . . N/A . . . . . . . . . . . . . . . . . . . . . . . . . . . Same as step l . . . . . . . . . . . . . . . . . . .

the receiver center frequency noted in

step 3f (2). Use steps 2b and c to

properly obtain this adjustment, except

do not note the result.

b. None.

b. Remove the connection between the

AN/URM-64A RF OUTPUT and CM-

77A/USM SIGNAL INPUT. Connect

the AN/URM-64A to the modulator.

c. Sensitivity --91.

t h e AN/URM-64A

AT-

c. A d j u s t

TENUATOR control to decrease its

output until the test set barely indicate

a n accept condition. Measure this

o u t p u t from the modulator on the