SAE Two T14 - Page 7

to st-ation
on
FM. If
you are
searching
for an extremely
low level
signal,
the
mute can
be
defeared
by releasing
the butrcn
to its out
position. The sensitivity
of
this muring
circuit
is adjustable
by a
rear panel control.
This control
should
be
set so as
not
to mute
the
weakest station
you intend
to
listen to.
Tuning
-
The T14 empþs
a
uniquedigimlly
synthesized
tuninglystem.
The
heart of
the system
is a
Quartz
Referãnce
Digital
C-ounter,
wh ich synthes
i zes
p recise
steps
that coincide
n,ith the exact
center
frequencies
of
all
assignable
FCC
ÂM andFM
frequencies.
The
tuning
system
is aáivated
by either
touch
tuning
button
for
up
-T"lt-
-
(highei numbers)
or
down scale
(lower numbers)-
The
T14
provides
two
alternate
methods of
tuning
with the
touch
tuning
system.
The auto
mode
(out)
provides
tuning
to
the
nèxt
available
broadcast station.In
the scan
mode
(in),
as
long as
either
runing button
is depressed,
the runer
will
continue
to
scan.
Once
released,
it
will
stop
at
the
next
FCC
assigned
frequency,
whether
there
is
a station
there
or
not. Once
this
digitally synthesized
tuning
system
reaches
an
assigned
frequenÇy
it
will automatically
activate
the
Quartz-Lock.
If a broadcast
signal
is present,
the
Quartz-Lock
will
then precisely
center
to the station
fiequency
for optimum
performance.
This
digitally
synlhesized
tuning
method
was first
developed
for
telemetry
reception
in NASA
sPace
Programs-
Frequency
Readout
-
The blue
fluorescent
dig-ital
frequency
readout
is a
precise
Quartz
reference
frequency
couoter
that
displays
either
FM
frequency
in MHz
(millions
of cycles)
or
AM frequency
in KHz
(1000's
of
cycles).
Stereo
-
The
stereo
indicator
becomes
illuminated
when
an
FM
Stereo
(or
multiplex)
signal
is being
received
by
the
Tl4.
In some
instances,
the
signal
level at
the antenna
may be
so
low
that
the
noise
generated
in
stereo
will
be
unácceptable
for
listening
Purposes-
It
is
recommended
that
thi
mode
switch
be
moved
to the
mono
position
which
will reduce
the
noise
and
defeat
the stereo
circuit'
However,
this should
only
be
done
in
the case
of
extremely
weak-stereo
signals.
IF
Band
-
The
T14
provides
selection
of
wide
(out)
or
narrow
(in)
Intermediate
Frequency
(IF)
Filters'
The
wide
position
is
recommended
for
normal
listening
since
this
provides
optimum
separation
and
low
distortion'
The
narrow
position
is
recommended
for
weak signal
reception
whlre a
much
stronger
nearþ
station
is
interfering
with
it.
Memory
-
The
T14
provides
memory
for 5
AM
and
5
FM
stations.
To store
a státion
in memory:
l) select
the
desired
station;
2)
press
the
memory
button,
then,
3)
press
the
desired
memory
location
(I'2,
)'
4, oç 5)'
DISPLRY
The
dual
fluorescent
bar
graph
displays
at
the
left
hand
side
of
the
T14, serve
a
multipurpose
role'
AM/FM
-
lVhen
the selector
is
moved
to
the
AM/FM
poririott,
the
upper
bar.
graph-
becomes
the
signal
strength
ini¡.",oi
for uãitr
AM
ãnðFM
reception'
The
lower
bar
i0