Figure 60. Module A8, parts location.
mc tuning knob through the 30.50
Connect the ME-26B/U to A9J3.
to 52.50 mc tuning range. A normal
Connect the 411A to A9J4.
rf level indicated by the 411A is
Set the receiver-transmitter front
0.060 volt 3 db.
panel controls as follows:
(6) Disconnect the 411A from A5J2 and
(a) BAND switch at 30-52.
connect it to A14J2. Check the in-
(b) Tuning knobs for 30.50 mc.
jection level into A14 while rotating
(c) Function switch at ON.
the mc tuning knob through the
b. Vfo Frequency Test.
(1) While - rotating the mc tuning knob
30.50 to 52.50 mc tuning range. A
normal rf level indicated by the
in 1-mc increments from 30.50 to
411A is 0.40 volt 1.5 db.
52.50 mc, observe the indications
(7) Disconnect the 411A from A14J2
on the ME-26B/U, the AN/USM-26,
and connect it to A8J2. Connect the
and the 411A.
(2) A normal apc voltage indicated
H - 1 3 8 / U to AUDIO connector
and press the push-to-talk switch.
throughout the tuning range by the
Check the injection level into A8
ME-26B/U is +3.6 volts dc 0.5.
while rotating the mc tuning knob
(3) Normal frequency indications ob-
through the 30.50 to 52.50 mc tun-
tained on the AN/USM-26 when tun-
ing range. A normal indication on
ing through the 30.50- to 52.50-mc
the 411A is 1.3 volts 2 db.
range are 42.000 mc 2 kc to 64.000
mc 2 kc. Each point of observation
(8) Remove module A14. Disconnect
the 411A from A8J2 and connect it
should differ by 1 mc 25 cps.
(4) A normal vfo rf output level indica-
to pin A of J20 (receptacle for A14).
Check the rf signal level while ro-
ted throughout the tuning range by
tating the mc tuning knob through
the 411A is 0.40 volt 1.5 db.
(5) Disconnect the 411A from A9J4 and
the 30.50 to 52.50 mc tuning range.
connect it to A5J2. Check the injec-
A normal indication on the 411A is
0.60 volt 2 db.
tion level into A5 while rotating the