IMPORTANT
NOTE
RELATIVE TO
SERIES
E-200-C and E-200
MODULATION
CONTROLS
On
page
(4)
of this book
reference is
made
to
setting
of
the
"Modulation
Control".
In
models
previous
to
E-200-C
this control is not direct
reading in terms
of percentage of
modulation,
instead, the
settings MUST be
made in accordance
with the approximate
settings chart
which appears below. This
chart
lists internal
modulation percentage
versus "Modulation
Control" set-
tings
and should
be
followed for
best
results.
If
this control be set
above
6.5,
or
above
100%
modula-
tion,
the modulation
tone may cut off as if
the control were
open. This is a
direct
result
of
overmodulation
and is
not
a
defect of the
instrument.
The
audio sections
of Series
E-200
and
E-200-C
are ca-
pable of
delivering
considerably
greater audio signal volt-
age than is
required for purposes of internal modulation of
the
R.F. signal.
Accordingly, oversetting the "Modulation
Control" quite understandably injects too
great an audio
signal into the R.F. amplifier-buffer section.
This high audio
output,
however,
is extremely desirable
when employed for
direct audio tests as
described
on page
(5)
.
When the audio test
signal
is to be
employed for
EXTER-
NAL
usage, the
"Audio Signal"
switch
is
no
longer
set to
"Mod. R.F.",
but instead to
"400
Cycle
Audio"
position.
Then
the "Modulation
Control"
may
be
set to whatever
level
is
required for the apparatus under
test, bearing in
mind the
information
contained
in
the
note
on page
(6)
.
On Series E-200-C,
percentage modulation
settings are
direct reading
on the
OUTSIDE set of numerals.
The
I.J5WEB,
ring,
jjl.au^wra^ft^represent
a
purely
arbitrary
set of figures for
reference use when
employing
the same
control for audio signal test purposes or for
external modulation percentage control. In such
cases the
"Audio Signal" switch would not
be
in the
"Modulated
R.F." position.
MODULATION SETTINGS FOR
MODELS PREVIOUS
TO
E-200-C
BEARING SERIAL
NUMBERS
BELOW No. 17801
%
MODULATION
CONTROL
SETTING
10%
3.4
20%
4.2
30%
4.8
40%
5.2
50%
5.4
60%
5.6
70%
5.8
80%
6.0
ce
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