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TABLE II
AM MODE
PLATE VOLTAGE
AND
PLATE
CURRENT
RATIO
Plate Voltage
Plate Current
PLATE
VX10
PLATE MA
*
300
200
250
240
200
300
NOTE
The
3.5-4.0
MC
ON-OFF
switch, lo-
cated under the TUNING control, must
be
in
the
OFF
position
for all fre-
quencies
other
than 3.5-4.0
MC
(80-
meter band) operation.
3.
Set the meter switch to PLATE
MA.
4.
Check that the RF output control on the
exciter
is in the OFF
position; no RF driving
power applied to the input.
5.
Place
the
PLATE
voltage
switch
in
the ON position.
6.
Observe
the
meter
for
indication of
idling current, (meter switch in PLATE MA posi-
tion).
When
utilizing the idling current
control
circuit
to
reduce
idling
current,
the auxiliary
contacts
on antenna
changeover
should
be open
(de-energized) and the idling current as indicated
by meter will be approximately 40 milliamperes.
If the idling current
control
circuit is not used,
a permanent jumper wire must be inplaceacross
the
two
screw
terminals
on
the
rear
of the
cabinet
and
the
meter
will
indicate
approxi-
mately 120 milliamperes of idling current,
7.
Set the meter
switch
to PLATE
VX10
position and note indication on meter (paragraph
5-5 and Tables I and II).
5-5.
CW OPERATION.
1.
Apply the filament and plate voltages by
completing
steps
1 through
7 of paragraph 5-4,
set the meter to PLATE
MA, andincrease the RF
output of the exciter in the CW mode (continuous
carrier)
until the meter
on the linear amplifier
indicates approximately 200 milliamperes.
2.
Set the meter
switch to the OUTPUT
position and adjust the plate TUNING control for
resonance (upward deflection of the meter).
3.
Increase
excitation
(check
resonance
each
time
the drive
is changed)
until either the
plate or grid current shown in Table lis reached.
4.
Set the meter switch to GRID MA posi-
"tion and observe
the grid current for comparison
with Table I.
5.
In the event the plate current
is less
than listed for the corresponding grid current ob-
tained during tuning, the amplifier is not loaded
to
its
optimum
condition.
Increase
loading by
rotating the plate LOADING control counterclock-
wise in small increments.
It may be necessary to
increase
the
exciter
output
to obtain optimum
conditions.
If the plate current is more than listed
'yf@im the corresponding grid current, the amplifier
is loaded too heavy. Decrease loading by rotating
the
plate
LOADING
control
clockwise
in small
increments.
It may
be necessary
to reduce
the
exciter output to obtain optimum conditions.
6.
Repeat steps 3 through
5 alternately,
gradually
increasing
the exciter output in incre-
ments
until the optimum conditions, specified in
Table
I, are
reached
for
the
plate
operating
voltage.
5-6.
SSB OPERATION.
1.
Follow
steps 1 through 7 of paragraph
5-4 and steps 1 through 6 of paragraph 5-5.
2.
Set the meter switch to the PLATE MA
position.
©
3.
Switch
the exciter
to the SSB position
and
adjust
the audio gain control until the linear
amplifier plate current peaks at 170 to 200 milli-
amperes while speaking in a normal tone of voice.
CAUTION
Do
not
apply
excitation
to the linear
amplifier
without plate voltage applied
to the 3-400Z.
3-7,
AM OPERATION.
1.
Follow
and complete steps 1 through 7
of paragraph
5-4 and steps 1 through 6 in para-
graph 5-5.
2.
Set
the
meter
switch
to the PLATE
MA position.
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