Whistler Group XP1200i Owner's Manual page 19

ADDITIONAL SAFETY FEATURES
For You Television Fans & Audiophiles.
Although the inverter is shielded and filtered to minimize signal
interference, some interference with your television picture
may be unavoidable, especially with weak signals. However,
here are some suggestions that may improve the reception.
1. First, make certain that the television antenna produces
a clear signal under normal operating conditions (i.e., at
home plugged into a standard 110 AC wall outlet). Also,
ensure that the antenna cable is properly shielded and of
good quality.
2. Change the relative positions of the inverter, antenna cables
and television power cord.
3. Isolate the television, its power cord and antenna cables from
the 12 volt power source by running an extension cord from
the inverter to the television set.
4. Coil the television power cord and the input cables running
from the 12 volt power source to the inverter.
NOTE: Inexpensive sound systems may emit a "buzzing" sound
when operated with the inverter. This is due to inadequate filters
in the sound system. There is no solution to his problem short of
purchasing a sound system with a higher quality power supply.
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