 |
|||
|
|
|||
|
|
|||
| ||||||||||
|
|  indication cannot be increased by
b. Gain and Bandwidth Test.
tuning.
(1) Connect the 411A between pins B
(11) Remove the shorting jumper from
and A of A5J1.
pins E and H of J9.
(2) Adjust the AN/URM-48 level to
(12) Replace A5.
obtain a 50-millivolt indication on
the 411A. (Note the db indication.)
(3) Disconnect the 411A from pins A
and B; connect it between pins C
and D of A5J1. Note the db indica-
tion.
a. Preparation.
(4) Compute the gain by subtracting
(1) Prepare the following equipment:
the db level noted in (2) above from
the db level noted in (3). Normal
(b) Frequency Meter AN/USM-26.
gain is 2.5 db.
(d) Adapter UG-274B/U.
(5) Connect the 411A between A21J3
and chassis ground and note the db
(e) Multimeter ME-26B/U.
level.
(2) Connect the AN/URM-48 output to
(6) Repeat the procedures given in (1)
a male connector of the UG-274B/
and (2) above, except adjust the
U.
AN/URM-48 level to obtain a 100-
(3) Connect the AN/USM-26 to the
millivolt indication on the 411A.
other male connector of the UG-
(7) Disconnect the 411A from pins A
274B/U.
and B of A5J1 and connect it be-
(4) Connect the female connector of
tween A21J3 and chassis ground.
the UG-274B/U to the receiver
transmitter ANT connector.
(8) D e c r e a s e the AN/URM-48 fre-
quency until the level indicated by
for 30.00 mc, with a deviation of
the 411A is again at the level noted
10 kc at 1,000 cps.
in (5) above. Record the frequency.
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals