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THEORY OF OPEILTION & GENERAL EXP101
.
4éTION OF Cr
,
?.CUITRY.
Of all the known methods used to generate a frequency modulated
signal,
the one used in this exciter unit is the simplest and
most straight forward.
Since the signal generation depends upon
direct crystal control,
the output frequency will be very stable.
In addition, tuned circuits will be uncritical in operation and
low cost receiving type tubes may be used in the majority of
circuits.
V101 is a crystal controlled oscillator.
The crystal controlled
output of V101 is shaped into a series of sawtooth waveforms
by V101 and V102,
for application to Modulator #1, V104.
The
output of Modulator #1,
V104,
is then again shaped into a saw-
tooth waveform at crystal frequency for application to Modula-
tor #2.
o
The reason for two Modulators is to increase the modulating
ability of the Exciter at low frequencies.
The two modulator
stages are driven in parallel from audio stages V116 and V117.
V107 through V114 are frequency multiplier stages.
V107 through
V111 are single ended pentode stages, while V112 through V114
are push- push doublers.
V115 is a power amplifier stage, which
is capable of producing 10 watts at output frequency of 88 to
108 mcs. The coaxial jumper between J101 and J102 connects
frequency multiplier stage V111 to V112, when Multiplex is
not in use.
When Multiplex is used, the output of J101 feeds
into the Multiplex
uhit
and the Multiplex unit feeds back to
the input jack,
J102.
Stages
V116 through V122 make up
a
conventional
-
regulated
power supply with an output voltage of 320 volts.
Maximum
current to be drawn from this power supply is in the vicinity
of 160 milliamps.
This unit has been properly tuned up at the factory.
If the
customer desires a complete tune-up procedure for the M6095 Exci-
ter unit,
it may be obtaincd by writing to the Gates plant.
M6095 Exciter
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