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3.
Switch
the
exciter
to the
AM
(DSB)
position
and
adjust the exciter
output until the
plate
current
meter
indicates
the plate voltage
and current ratio shown in Table II.
5-8.
VOICE OPERATED
BREAK-IN
(VOX).
When
the
exciter
utilizes
voice
operated
break-in
(VOX)
the PLATE
switch
is left in the
ON position. The antenna
relay is actuated by the
VOX
relay to transfer
the antenna and close the
auxiliary contacts on the antenna relay.
5-9.
CALCULATING
POWER
INPUT.
To determine
the average
DC plate power
input, multiply the plate current
by the voltage
indicated
on
the
meter
in the
PLATE
VX10
position (333 MA x 300 x 10 = 999 watts).
Meter
readings
will be accurate oniy when
a steady
CW
input is being measured.
As pre-
viously
mentioned,
many
factors
influence
the
indicated plate current on SSB.
SECTION
VI
SERVICE DATA
WARNING
HIGH VOLTAGE
PRESENT
DC voltages
in excess
of 3,000 volts
are
present
in
the
linear
amplifier
and
power
supply.
DO
NOT
attempt
to measure voltages with hand-heldtest
leads or to service this amplifier with
the high voltage
supply on. In addition
to the danger of serious injury or death
from
the high voltage
supply, serious
radio
frequency burns can result from
coming
in contact
with
or
in close
proximity
to the plate and output cir-
cuits.
6-1.
CLEANING.
Equipment
utilizing forced-air cooling will
coilect dust within the unit, depending on the dust
content of the circulated air.
All components should be kept clean, as any
accumulation
of dust
in the high
voltage
or
RF
areas
may
cause arcing and consequent damage.
CAUTION
When cleaning the variable capacitors,
use
care
so
as
not
to nick
or bend
capacitor , 'ates. Never use solvents for
cleaning
any
°omponent or area of the
unit. To.
pre:
2d method of cleaning
is the use
of a
'acuum
cleaner while
dusting with a ciean,
flexible-bristle
brush.
6-2.
LUBRICATION.
Lubricate the blower every six months with
a
few
drops
of SAE
No.
10 oil at the front and
rear oil retainers.
Do not over lubricate.
10-
6-3.
OPERATING
AND SERVICE
QUESTIONS.
For
further
information
regarding
opera-
tion or servicing
of this equipment,
contact the
dealer
from
whom
the unit was
purchased. The
Hallicrafters
Company
maintains
an
extensive
system
of Authorized Service Centers where any
required service will be performed promptly and
etficiently
at
no.
charge
if this
equipment
is
deiivered
to
the service
center
within
90 days
from
date of purchase
by the original buyer and
the
defect falls within the terms of the warranty.
It is necessary to present the Bill-of-Sale inorder
to establish warranty status.
After the expiration
of the warranty, repairs will be made fora nomi-
nal charge.
All Hallicrafters
Authorized
Service
Centers
display
the sign shown
below.
For
the
location
of
the
one
nearest
you,
consult
your
dealer or your local telephone directory.
Make
no service
shipments
to the factory
unless instructed to do so by letter,as The Halli-
crafters
Company
will not accept responsibility
for unauthorized shipments.
The
Hallicrafters
Company
reserves
the
privilege
of making revisions
in current produc-
tion of equipment
and assumes
no obligation
to
incorporate such revisions in earlier models,
i
Authorized
Vp
hallicratters
Service Center
Communications Equipment
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