Specifications

a. Carefully increase the output from the AN/
GRM-50and note voltage indicated on the
AN/URM-145 when the RED indicator goes out
and the GREEN indicator lights. Check to be
sure that the output is still 5.65 mc ±100 cps and
that the change in indicator occurs between 0.125
and 0.250 volt.
f. Remove temporary connections A and B (fig.
34.6) and make temporary connection C. Adjust
the AN/GRM-50 for an output of 5.65 mc ±20
kc, as indicted on the AN/USM-26, and decrease
the output to 0 volt, using the fine attenenuator.
g. Turn the selector switch to 15.
h. Carefully increase the output from the AN/
GRM-50 and note the voltage indicated on the
AN/URM-145 when the RED indictor goes out
and the GREEN indictor lights. This action
must occur between 0.200 and 0.250 volt. De-
crease the output of the AN/GRM-50 to 0 volt,
using the fine attenuator.
i. Turn the selector switch to 16.
j. Carefully increase the output from the AN/
GRM-50 and note the voltage indicated on the
AN/URM-145 when the RED indicator goes out
and the GREEN indicator lights. This action
must occur between 0.170 and 0.210 volt. De
crease the output of the AN/GRM-50 to 0 volt;
use the fine lttenuator.
k. Turn the selector switch to 17.
L Carefully increase the output from the AN/
GRM-50 and note the voltage indticated on the
AN/URM-145 when the RED indicator goes out
and the GREEN indicator lights. This action
must occur between 0.650 and 0.810 volt. De-
crease the output of the AN/GRM-50 to 0 volt;
use the fine attenuator.
68. Amplifier, 11.5-Mc, Tests
(fig. 84.6)
a. See that the special junction box is connected
between the UG-274B/U and the probe assembly
(with the AN/URM-145 connected to the special
junction box), that the output of the AN/GRM-
50 is connected to the UG-274B/U, and that the
AN/USM-26 is connected direct to the UG
274B/U.
b. Adjust the AN/GRM-50 for an output of
11.6 mc ±40 kc, as indicated on the AN/USM-26,
and dEcrease the output to 0 volt; use the fine
attenuator.
c. Turn the selector switch to 7.
d. Carefully increase the output from the AN/
GRM-50 and note the voltage indicated on the
8
AN/URM-145 when the RED indicator goes out
and the GREEN indicator lights. This action
must occur between 0.230 and 0.330 volt. De-
crease the output of the AN/GRM-50 to 0 volt;
use the fine attenuator.
e. Turn the selector switch to 9.
f. Carefully increase the output from the AN/
GRM-50 and note the voltage indicated on the
AN/URM-145 when the RED indicator goes out
and the GREEN indicator lights. This action
must occur between 0.100 and 0.140 volt. De-
crease the output of the AN/GRM-50 to 0 volt;
use the fine attenuator.
g. Turn the selector switch to 13.
h. Carefully increase the output from the AN/
GRM-50 and note the voltage indicated on the
AN/URM-145 when the RED indicator goes out
and the GREEN indicator lights. This action
must occur between 0.180 and 0.250 volt. De-
crease the output of the AN/GRM–50 to 0 volt;
use the fine attenuator.
i. Turn the selector switch to 14.
j. Carefully increase the output from the
AN/GRM-50 and note the voltage indicated on
the AN/URM- 145 when the RED indicator goes
out and the GREEN indicator lights. This action
must occur between 0.012 and 0.016 volt. De-
crease the output of the AN/GRM-50 to 0 volt;
use the fine attenuator.
69. Amplifier, 47. 0-MC, Test
(fig 34.5)
a. See that the special junction box is connected
between the UG-274B/U and the probe assembly
(with the AN/URM-145 connected to the special
junction box), that the output of the AN/GRM-
50 is connected to the UG-274B/U, and that the
AN/USM-26 is connected direct to the UG-
274 B/U (fig. 34.6).
b. Adjust the AN/GRM-50 for an output of
47.0 mc ±100 kc, as indicated on the AN/USM-
26; and decrease
the output to 0 volt; use the-fine
attenuator.
c. Turn the selector switch to 18.
d. Carefully increase the output from the AN/
GRM-50 and note the voltage indicated on the
AN/URM-145 when the RED indicator goes out
and the GREEN indicator lights. This action
must occur between 0.100 and 0.135 volt. De
crease the output of the AN/GRM-50 to 0 volt;
use the fine attenuator.
AGO 8834A