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|  (9) Repeat the procedures given in (1)
through (8) above until the 411A
indication cannot be increased by
a. Preparation
tuning.
(1) Prepare the following equipment:
(lo) Set the BAND switch on the re-
(a) Frequency Meter AN/USM-26.
ceiver-transmitter at 53-75, and
the tuning knobs at 53.00 mc.
(c) Rf Millivoltmeter 411A.
(11) Disconnect the 411A from J1S1 and
(d) Handset H-138/U.
connect it across the AN/URM-48
output.
(f) Multimeter ME-26B/U.
(12) Adjust the AN/URM-48 frequency
(2) Connect the H-138/U to an AUDIO
to 53.00 mc and the level to 100
connector.
millivolts, as indicated by the
(3) Connect the AN/URM-43A to ANT
411A.
connector J2.
(13) Disconnect the 411A from the AN/
(4) Set the front panel controls of the
URM-48 and connect it between
receiver-transmitter as follows:
pins 1 and 2 of S1J1.
(a) BAND switch at 30-52.
(14) Adjust T3 for a peak indication on
(b) Tuning knobs at 30.00 mc.
the 411A.
(c) Function switch at ON.
(15) Change the AN/URM-48 frequency
(5) Remove module A8.
and the RT-505/PRC-25 tuning
(6) Connect the AN/URM-48 output to
knobs to 75.95 mc.
the input of the AN/USM-26. Adjust
(16) Adjust C8 for a peak indication on
the AN/URM-48 for 30.000 mc, as
the 411A.
indicated by the AN/USM-26.
(17) Repeat (10) through (16) above un-
b. Gain and Bandwidth Test.
til the 411A indication cannot be in-
(1) Connect the output of AN/URM-48
creased by tuning.
(18) Replace A7.
between pins 1 and 2 of J1.
Figure 58. Module A6, parts location.
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