Yamaha tx-497 Bedienungsanleitung Seite 10

CONNECTIONS
Connecting the outdoor FM antenna
If this unit is installed inside a steel building or at a great
distance from the transmitter, it may be necessary to
install an outside long wire antenna.
Use a commercially available 300-ohm/75-ohm antenna
adapter or an antenna adapter (included for U.S.A. and
Canada models only) for connections, if necessary.
Antenna adapter
(included for U.S.A. and
Canada models only)
75-ohm coaxial
cable
Commercially available
antenna adapter
75-ohm coaxial
cable
300-ohm feeder cable
Commercially available
300-ohm/75-ohm antenna adapter
8
Consult with your dealer or authorized service center
about the best method of selecting and erecting an outdoor
FM antenna. The choice of the feeder cable is also
important. Flat ribbon-shaped twin-lead cable performs
well electrically, and is cheaper and somewhat easier to
handle when routing it through windows and around
rooms. Coaxial cable is more expensive, does a much
better job of minimizing interference, is less prone to the
effects of weather and close-by metal objects, and is
nearly as good a signal conductor as feeder cable,
particularly for foam-type coaxial cables. Coaxial cable is
somewhat more difficult to install at the point where the
cable enters the building. If coaxial cable is selected, make
sure the antenna is designed to be used with that type of
FM ANT GND AM ANT
cable.
75Ω UNBAL
Notes
• To minimize interference from automobile ignition, locate the
antenna as far from heavy traffic as possible.
• Keep the feeder cable or coaxial cable as short as possible. Do
not bundle or roll up excess cable.
• The antenna should be placed at least 2 meters from reinforced
concrete walls or metal structures.
Because the interstation frequency
spacing differs in different areas, set
the FREQUENCY STEP switch on
the rear panel of this unit according to
the frequency spacing in your area.
• North, Central and South America:
100 kHz/10 kHz
• Other areas: 50 kHz/9 kHz
Before setting this switch, disconnect this unit's AC power
plug from the AC wall outlet.
Notes on the 75-ohm coaxial and
the 300-ohm feeder cables
75-ohm coaxial
cable
FREQUENCY STEP switch
(Asia and General models only)
300-ohm feeder
cable
FREQUENCY STEP
FM 100kHz 50kHz
AM 10kHz 9kHz