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TeachLogic PA-849 Owner's Manual page 6

Portable wireless uhf sound system

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INTRODUCTION
product description
About RF Transmission
RF (radio frequency) wireless microphones have
become commonplace use for the convenience
of free movement with a microphone. Today's
technology and advanced engineering has made
the wireless microphone very reliable and render
excellent vocal quality.
However, there are some inherent deficiencies that
it is helpful to be aware of. RF is a radio signal being
transmitted from the microphone to a receiver, like
the radio transmitter transmitting to your radio.
Note; whenever you are transmitting through
space, you are always subject to interference by
another transmitting source. This can show up as
static, interruption (dropouts), or even complete
blockage. To overcome interference, change the
channel to a non-competing frequency. Just like
when you drive near a powerline and you get a lot
of static on your radio.
Another issue of awareness, RF can transmit in
all directions and through solid surfaces for a
distance of more than 100 feet. Therefore, what is
said into the microphone will be transmitted and
heard at all times unless the microphone is muted
or turned off.
Wireless microphones are highly regulated by
the FCC. There are frequency restrictions, power
output limitation, and length of antenna.
The most troublesome problems occur as the result
of low battery output. Typically, Alkaline batteries
will provide 8–10 hours service and rechargeable
batteries 6–8 hours.
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