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2.
All station equipments should be bonded
together and connected to an earth ground.
4.
A source of RF driving power must be
connected
to
the
RF
input connector
through
a
length of coaxial cable.
5.
The
antenna
changeover
relay should
be in the antenna transmission line and the idling
current
control
circuits
should be connected
to
the changeover
relay or be shorted
out perma-
nently by a jumper, as covered in Section III.
6.
The
FILament
and
PLATE
switches
must be in the OFF position. The topcover of the
amplifier
must be in place and secured to com-
plete the interlock circuit.
7.
The
power
« nnection
to
the
power
supply should be connec' :d to the AC power line.
CAUTION
Never
connect
equipment
to
the
AC
power
line with the power switches in
the ON position. °
5-3.
TUNING.
Tuning of the linear amplifier necessitates
observing
the relative output at a meter or other
indicating
device.
This
is characteristic
of all
linear
amplifiers
because
they do not exhibit as
pronounced a dip at resonance asaclass C ampli-
fier.
The
power
input at resonance is dependent
upon the RF driving power
applied and upon the
loading.
After
the linear
amplifier
is properly
resonated and loaded, output power may be reduced
by decreasing the exciter output.
8-
NOTE
TABLE
I
OPTIMUM
VOLTAGE
AND CURRENT
RATIOS
5-4.
PROCEDURE.
NOTE
Allow a minimum
of four minutes for
filament warmup before applying plate
voltage. When using the Mark IIA Power
Supply,
the delay permits the mercury
vapor
rectifier
tubes
to reach proper
operating
temperature.
If a prolonged
period
of time
has
elapsed
between
operation,
a fifteen-minute
delay may
be desirable upon initial starting of the
equipment
to permit
mercury
vapor
tubes
to reach proper operating temp-
erature.
2.
Set the BAND
SWITCH
to the desired
frequency
range, and the TUNING and LOADING
controls
to the center of the corresponding fre-
quency on the front panel markings. These mark-
ings
are
approximate
and
serve
as a Starting
point in tuning.
Do
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