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The
front
panel
may
now
be
closed
and
fastened
using
the
three
hex- socket
screws.
Normally,
all access required from
now on can be
achieved through the
smaller access door ( equipped with a key lock).
Initial
Electrical
Checkout:
Plug
the
power
cord
into
an
outlet
whose
voltage
corresponds to the setting of the internal LINE VOLTAGE SELECTOR switch. The
unit
should spring
to life. Check to
make sure that
the following events occur:
A) The green POWER LED is illuminated;
6) The
red
GATE
LED
is
illuminated ( provided
that
the
COMPRESSOR
PROOF/OPERATE switch is in OPERATE);
C) Both yellow HF LIMIT LED's are off;
D) The
TOTAL
MASTER
G/R,
COMPRESSION
MASTER
G/R,
and
TOTAL
BASS
G/R
meters drift slowly to " 0", while the LIMITING MASTER G/R meter reads
"0" immediately.
E) All
VU
meter
positions read " 0%" except
for "+ 15VDC"
and " 45VDC", which
read 100% + 5%.
If
anything
is
abnormal, repeat
the Physical Inspection described above
to make
sure that you didn't miss anything. A preliminary diagnosis should be made, and if
necessary, the factory should be consulted.
If you wish to perform a more rigorous and complete checkout before installation,
Appendix D ( Field Audit-Of-Performance Procedure) provides complete instructions.
Equipment
Location:
OPTIMOD-TV
is
supplied
in
either
single- chassis
or
dual-
chassis
versions.
The dual- chassis
version splits the system
at
the
output
of
the
compressor. The studio chassis may be located in any convenient rack space in the
studio. It is important to bear in mind that its RFI suppression is modest because
it
was
assumed that the unit would be operated at a considerable distance from
high-powered transmitters.
The
main chassis, which is highly RFI-suppressed,
is ordinarily
located reasonably
close to the transmitter's aural exciter or phase- linear STL transmitter. The chassis
requires 4 units ( 7"/17.8cm) in a standard 19" rack.
Although
a good
monitoring
loudspeaker
system
seems rare
at
transmitter
sites,
such
a system which can be easily heard from the location in which OPTIMOD-TV
is mounted will facilitate subjective adjustments.
Difficult Environments:
1.
Where
humidity
is
typically
high,
the
environment
should
be
controlled
to
prevent
moisture
from
condensing
on
circuit
cards
of
all
plant
equipment,
including
OPTIMOD-TV,
as
this
can
degrade
performance.
Using
some
of
the
exhaust
from
the
transmitter
to
heat
the
building
slightly
above
ambient
temperature is often sufficient to prevent problems.
2.
If electrical storms are frequent, it may be advisable to add suitable Varistors
or other protection between each incoming wire ( AC, remote control, and audio)
and a solid earth ground as indicated by local experience.
3.
OPTIMOD-TV has been carefully
designed to operate
in high-energy VHF/UHF
environments and no special placement precaution need be observed unless RFI
is encountered in operation.
4.
Please
remember that
the reliability of any electronic equipment
is enhanced
by
maintaining moderate operating temperatures. OPTIMOD-TV should never be
operated in ambient above 50 degrees C ( 122 degrees F).
3-5
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