Fleetwood 1999 Discovery Parts And Service Manual page 124

AppliANCES
The television and radio systems in your RV have been cho-
sen to provide good performance under varied signal condi-
tions. Occasionally, though, you may experience ghosts on
TV, flutter when listening to FM broadcasts, or other signal
interference.
The fault is normally not with your receiver or antenna sys-
tem. The idea that antennas, whether amplified or not, "pull
in" a signal is a popular misconception. An antenna does not
pull a signal out of air by virtue of its "power." The antenna
only responds to signals present at the antenna elements.
Antennas with boosters only amplify these signals.
Since distance from the broadcast tower is critical to recep-
tion clarity, remember that TV and FM signals have a range
of only about 75 miles under the best of atmospheric and
geographic conditions. The good reception you get at parks
located at great distances from broadcast facilities is proba-
bly the result of satellite, microwave or other cable distribu-
tion systems. The antenna on your RV is no competition for
these very expensive installations.
In addition, TV and radio frequency interference results from
the electromagnetic fields produced by electric arc discharge.
This arcing is found in lightning, vehicle ignition systems,
and in 12-volt DC (brush type) motors used in power vents
and furnaces. Note that nearly every DC motor has brushes.
Most alternating current (AC) motors do not have brushes,
and therefore do not generate the arcing interference. This is
why this type of interference is less noticeable in a house-
hold environment.
TV
AND RADIO
INTERFERENCE
DisCOVERY
:r-