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|  (13) Adjust T2 for a peak indication on
(2) After the replacement of a faulty
part, perform the alignment proce-
the 411A.
dures given in d and e below, and
(14) Change the AN/URM-48 frequency
repeat the procedures in a and b
and the receiver-transmitter tun-
above.
ing knobs for 75.95 mc.
(15) Adjust C6 for a peak indication on
d. Preparation fix Alignment.
(1) Set the receiver-transmitter front
the 411A.
panel controls as follows:
(16) Repeat the prc cedures given in (9)
through (15) above until the 411A
(a) BAND switch at 30-52.
indication cannot be increased by
(b) Function switch at ON.
(2) Connect the AN/URM-43A to ANT
tuning.
(17) Replace A8.
connector J2.
(3) Connect the H-138/U to an AUDIO
connector.
(4) Remove module A8.
(5) Connect the AN/URM-48 between
pins 1 and 2 of A7J1.
a. Preparation.
(1) Prepare the following equipment:
e. Alignment Procedure.
(1) Set the receiver-transmitter tun-
(a) Frequency Meter AN/USM-26.
ing knobs for 30.00 mc.
(2) Connect the 411A across the output
of the AN/URM-48. Press the
(d) Handset H-138/U.
push-to-talk switch.
(3) Adjust the AN/URM-48 frequency
(f) Multimeter ME-26B/U.
to 30.00 mc and level to 100 milli-
(2) Connect the H-138/U to an AUDIO
volts, as indicated by the 411A.
connector.
(4) Disconnect the 411A from the AN/
(3) Connect AN/URM-43A to ANT con-
URM-48 and connect between pins
nector J2.
3 and 4 of J1.
(4) Set the front panel controls of the
(5) Adjust T3 for a peak indication on
receiver-transmitter as follows:
the 411A.
(a) BAND switch at 30-52.
(6) Change the AN/URM-48 frequency
(b) Tuning knobs for 30.00 mc.
and the receiver-transmitter tun-
(c) Function switch at ON.
ing knobs to 52.95 mc.
(5) Remove module A9.
(7) Adjust C9 for a peak indication on
(6) Connect the AN/URM-48 output to
the 411A.
the input of the AN/USM-26. Adjust
(8) Repeat the procedures given in (1)
AN/URM-48 for 30.000 mc, as in-
through (7) above until the 411A
dicated by the AN/USM-26.
indication cannot be increased by
b. Gain and Bandwidth Test.
tuning.
(1) Connect the output of the AN/URM-
(9) Set the BAND switch on the re-
48 between pins 1 and 2 of A8J1.
ceiver-transmitter to 53-75, and
(2) Connect the 411A across the AN/
the tuning knobs to 53.00 mc.
URM-48 output. Press the push-to-
(10) Disconnect the 411A from J1 and
talk switch. Adjust the AN/URM-48
connect it across the AN/URM-48
for a 100-millivolt indication on the
411A. Note the db indication.
output.
(11) Adjust the AN/URM-48 frequency
(3) Disconnect the 411A from the AN/
to 53.00 mc and the level to 100
URM-48 and connect it between
millivolts, as indicated by the
pins 3 and 4 of A8J1. The 411A
411A.
should indicate 19 db more than the
(12) Disconnect the 411A from the AN/
value indicated in (2) above. (This
value, +19 db, is the stage gain.)
URM-48 and connect it between
pins 3 and 4 of A7J1.
118
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