Grounding
FM
While
grounding
an
outdoor antenna
is
vitally important, there's
normally
no
need
to
ground
the
tuner itself.
But
with safety
and
possibly reduced interference
in
mind,
you may
want
to
ground
the
tuner
chassis.
If so, run a
heavy
(12-gauge
or
heavier copper/alum.)
wire
from
the
tuner
to a
metal
cold water pipe. You'll have
to
check
to
make sure
the
metal pipe
is
grounded;
PVC
(plastic) pipes
are
somtimes
run in
from
the
water main
to the
house, then metal pipes
are
used within
the
house. NEVER attach
a
ground wire
to a gas
pipe,
either
for
your components,
or
antenna.
The
best grounding scheme
is a
ground
rod
driven
several feet
into
the
earth.
See the
chapter
on
ANTENNAS
for
information
on
installing
a
ground rod.
Antenna
Terminals
AM
Two
AM
antennas have been provided with your
TX-11
b.
Experimentation will tell
you
which antenna works best
for
your
location.
See the
chapter
on
ANTENNAS
for
further informaton.
AM
Loop Antenna
The
first
is a
high performance, noise-free
AM
loop antenna held
on
the
rear panel with
a
snap-in hinge. Swivel
it out for
best reception.
You
may
also remove
the
antenna from
its
hinge
and
attach
it to a
nearby wall.
The
length
of the
antenna cord
is 2
feet
and
should
not
be
pulled tight.
Securely
connect
the
loop antenna leads
to the AM and GND
terminals.
AM
Wire Antenna
The
second
AM
antenna
is a
wire that attaches
to the AM
terminal
of
the
TX-11
b.
This wire will increase
AM
sensitivity,
and we
highly
recommend
its use for AM
stereo reception.
You
can
either
connect
directly
to
your
local
Cable
Television
System
for FM
(consult your
Cable
Operator)
using coaxial
cable,
or use the
supplied
75/300
ohm
adaptor
and
dipole
ribbon
antenna.
Caution should
be
used
when
connecting
your
Preamp/Tunerto
an
external
outside
TV/FM
antenna.
See
Notice
located
in
the
front
of
this
manual.
If
uncertain,
please
refer
to
qualified
personnel.
If hum
occurs
when
using
the 75 ohm
terminal,
install
a
75/300
ohm
balanced
transformer
to the
coaxial
cable,
and
reconnect
to the
supplied
300 ohm to 75
ohm
adapter
to
break
the
ground loop that
is
causing
the
offending
hum.
A
commercial cable company,
as a
matter
of
procedure
and
policy,
most
often connects
a
tuner using
the 300
n
antenna terminals.
Few
tuners have provisions
for
direct connection
to
750
feeds. Normally,
a
feedline
from
a FM
trap
is
connected
with
a
matching
transformer
(75
ft to 300 ft) to the 300 ft
antenna terminals
by the
cable company
installer. Their transformers come with spade lugs
on the
leads,
and
are the
same type used
to
terminate
a
regular
TV
cable
at the VHF
antenna terminals
of a TV
set. NOTE:
It
isn't legal
to
"do-it-yourself
and tap
into
a
commercial cable
TV
system without telling
the
cable
company.
So,
don't
do
it...
even
if you
know how!
If
you can
talk
the
installer
into connecting
the
cable feed directly
to
the
75 ft
terminals,
ask to
have
a
female
to
female coaxial connector
inserted between
the
main feed from
the FM
trap
and a
shorter piece
of
cable connected
to the
tuner. This provides
an
easy disconnect
for
the
cable
lead-in,
without unhooking
it at the
TX-11
b's
rear panel.
This
is an
especially good idea
for
those
who
will
use 75 ft
coaxial
cable with their
own
antenna systems
for
quick disconnect during
electrical storms.
GND
AM
I I
oo
750
•ANTENNA
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