SAFETY:
Standard safety precautions must
be
followed at all times when installing, operating,
servicing, and repairing this.)equipment. INIVEN/CONOLOG
CORP.
assumes no liability
for failure to observe standard or specifically noted safety requirements or to use this
equipment for purposes other than intended.
GROUNDING: Asuitable ground
is
required to reduce the hazard of shock. Refer
to
the
enclosed module, chassis, and/or cabinet 'wiring diagram for ground connection locations.
ENVIRONMENT: Operation of any electrical equipment
in
any area containing gases, fumes,
wet, or damp
is
apotential safety hazard. Necessary precautions should
be
taken.
MANUAL: Operators and maintenance personnel should read this manual before installing
the equipment and placing it
in
service. Only properly trained personnel with proper tools and
equipment should operate, maintain, repair, or service this equipment.
SHOCK: Potentially dangerous electrical shock can occur whenever working
on
this product.
Protective measures and safety procedures should
be
observed
at
ali
times.
THEORY
OF
OPERATION:
GENERAL: The unit generates
an
audio tone which changes frequency when the input
is
keyed. The keying inputs are referred
to
as
mark and space.
In
the two frequency mode,
the audio tone output
is
at afrequency plus or minus the shift (programmable)
of
the
programmed center frequency. Upon keying (applying avoltage), the transmitter changes
state to the opposite frequency.
In
atwo frequency system, the center frequency
is
not
produced.
In
athree frequency unit the center frequency
is
normally generated when neither a
mark or space output
is
present. When the transmitter is keyed
to
the space frequency the
receiver space output
is
activated and when the transmitter
is
keyed to the mark frequency
the receiver mark output
is
activated. Only one keying input should
be
on
at agiven time
unless the IT-30DSP and receiver are set to operate
in
flasher mode. The Flasher option
on
the IT-30DSP allows the unit to shift between mark and space frequencies rapidly when both
inputs are
keyed
simultaneously.
Athird keying input
is
available which allows the audio tone output to
be
turned on/off.
The
RTS
(carrier on/off) input permits the transmitter to
be
used
in
systems requiring aquiet
line until communications
is
need such
as
apolling or data system.
PROGRAMMING: Upon applying power to the unit, the Digital Signal Processor (DSP) (U5)
reviews the program information
of
octal inverting buffers
(U
12
&U
13)
which have been set
by switches
SW1
and SW2.
