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SECTION
III
INITIAL TUNE -UP
General Operational Procedure
Before proceeding with
the
initial tune -up
let us
recheck the
necessary things
to
be done before any voltage is applied
to
any
portion
of the
transmitter.
Briefly, check the following
list:
1
-
Proper line voltage
to
fuse block
A?.
2 -
Froper location
of all
tubes in the sockets.
3
-
Froper termination
of the
antenna or dummy antenna
equipment.
4
-
Removal
of all tie
-down straps and other materials
used for shipping purposes.
5 -
A recheck
to
be sure components removed for shipment
have been installed properly.
6
-
Complete check
of the
transmitter with
a
screwdriver
and
wrench
to
be sure all bolts, screws and other
connections that could possibly work loose
in shipment
have been brought down securely.
7 -
Looking over
all
wiring for broken solder connections,
making
sure that
everything
is
secure.
8
-
Making certain
the
transmitter
is
well grounded and
that the ground
to
the transmitter
is
tied
to the
main ground
of the
antenna system.
THIS IS VERY
IMPORTANT.
AT
LEAST
2"
COPPER STRAP RECOMMENDED.
9 -
Making certain that transformers with voltage
correction taps have
one side of the
supply line
connecting
to
terminal
#1.
10
-
Making
sure audio
wiring has been properly shielded
and that the shields have
been properly grounded,
and that
no
input wire runs in the same cable
as
an
output wire or
a
power
cable.
In case the
transmitter
is
located on the upper floor
of
a
building, particular attention must be paid
to
grounding
of
the
equipment.
Additional ground busses and elimination
of
varied ground potentials
is
highly important for good per-
formance and low noise.
With
the
transmitter ready
to
operate, the service switch
is
closed and power supplied
to
the transmitter.
Pressing
the
"Filament ON" switch
Sl,
lights the tube filaments and the
power supply for
the
M
-5422 oscillator unit.
The
oscillator
unit
is
tuned according
to the
directions given in the instruc-
tions for this unit.
When the transmitter has been factory
9/11/63
-8-
BC -250GY
-1
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