161027

Yamaha tx-492 Manual

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Connecting the indoor FM antenna Connecting the AM loop antenna
* If you connect an outdoor FM antenna to this unit, do not connect the indoor FM antenna to this unit.
* The AM loop antenna should be placed apart from the main unit. The antenna may be hung on a wall.
* The AM loop antenna should be kept connected, even if an outdoor AM antenna is connected to this unit.
5
English
Ⅵ Optional outdoor FM antenna
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
cable.
* Use a 75-ohm/300-ohm antenna adapter (not included) or a
75-ohm antenna adapter (not included) for connections.
300-ohm feeder cable 75-ohm coaxial cable
75-ohm/300-ohm antenna adapter
Notes for FM antenna installation
●
To minimize automobile ignition noise, 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 at least two meters (6.6 feet) from
reinforced concrete walls or metal structures.
300-ohm feeder
cable
75-ohm coaxial
cable
75-ohm antenna
adapter
75-ohm coaxial
cable
Orient so that the best
reception is obtained.
Ⅵ Optional outdoor AM antenna
In steel buildings or at a great distance from the transmitter, it
may be necessary to install an outside long wire antenna.
GND terminal
For maximum safety and minimum interference, connect
the GND terminal to a good earth ground. A good earth
ground is a metal stake driven into moist earth.
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