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Page Title:
If. Amplifier Alignment, Tuning Unit 3, General |
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|  92. If. Amplifier Alignment, Tuning
a t o r front-panel CARRIER OUT-
PUT jack.
Unit 3, General
(2) Disconnect plug P407 on tuning unit
cable assembly W402 from its mat-
a. Tuning unit 3 differs from tuning units
ing jack J406 on the top side of the
1 and 2 in that it has two if. amplifier sub-
t u n e r subassembly (fig. 58). Plug
assemblies. One subassembly contains the
P407 is a UG-88/U connector
third through sixth if. amplifiers and an if.
( B N C - s e r i e s ) and is located adja-
c a t h o d e follower; the other contains a
c e n t to the worm gear on the rf
cascode driver-amplifier s t a g e and the
tuner.
f i r s t two stages of if. amplification. To
(3) Use a UG-201A/U adapter to inter-
align t h es e subassemblies, remove the
connect the output end of Cord CG-
m a i n unit from its instrument case (para
55 B/U to P407, at the input of the
i f . preamplifier.
move the dust cover from tuning unit 3 and
c. As in tuning units 1 and 2, the cores
interconnect tuning unit 3 to the main unit
of the tuned networks on the if. preampli-
with the test harness (fig. 46).
f i e r and amplifier subassemblies are pro-
v i d e d with hexagonal nuts. Use the same
b. Inject the unmodulated output of the
p l a s t i c alignment tool for adjusting the
tuning unit 3 signal generator into the if.
l/4-inch hexagonal nuts on this tuning unit
p r e a m p l i f i e r as follows:
as was used for the previous tuning units.
(1) Connect one end of Cord CG-
T h e locations of the adjustment controls
55B/U, supplied with the tuning unit
are listed in the following chart:
3 signal generator, into the gener-
202
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