Radio Interference; More Than One Cordless Telephone - NEC DTH-4R-2 - CORDLESS Lite II BLAC Owner's Manual

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Radio Interference

Radio interference may occasionally cause buzzing and humming in your
cordless handset, or clicking noises in the base unit. This interference is
caused by external sources such as TV, fluorescent lighting, or electrical
storm. Your unit is NOT DEFECTIVE. If these noises continue and are too
distracting, check around your office to see what appliances may be causing
the problem. In addition, we recommend that the base not be plugged into a
circuit that also powers a major appliance because of the potential of
interference. For best performance, ensure that the antenna on the base unit
is fully extended.
In the unlikely event that you consistently hear other voices or distracting
transmissions on your telephone, you may be receiving radio signals for
another cordless telephone or other source of interference. If you cannot
eliminate this type of interference, you need to change to a different channel.
Finally, it should be noted that some cordless telephones operate at
frequencies that may cause interference to nearby TVs and VCRs. To
minimize or prevent such interference, the base of the cordless telephone
should not be placed near or on top of a TV or VCR. If interference is
experienced, moving the cordless telephone farther away from the TV or VCR
will often reduce or eliminate the interference.

More than One Cordless Telephone

If you want to use more than one cordless telephone in your office, they must
operate on different channels and more than 20 feet apart. Press the channel
key to select a channel that provides the clearest communication.
Depending on your environment, the maximum number of cordless devices
used without interference varies.
Multiple base and handset units should not be closer than 20 feet at any time.
Radio interference causes interruptions in conversation. When this happens,
your unit is not defective. When noise continues, move to a different location
while you talk. (You might even need to move the base unit.) When the
situation persists, contact National Technical Assistance Center.
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