Alto Professional Stealth Wireless Guide D'utilisation page 13

Troubleshooting
Problem
The receiver does not produce any
sound.
There is audible interference in the
transmission.
The signal is distorted.
Solution
Make sure the receiver's power adapter is properly connected to
the power connector and a power source.
Make sure the receiver's audio output is properly connected to
your mixer, amplifier system, etc. Also, make sure the volume
controls on your mixer and speaker are turned up.
Make sure both the transmitter and receiver are set to the same RF
frequency and channel.
Make sure the receiver and transmitter are within 200 feet (60
meters) and have a clear line of sight. Also, make sure the receiver
is not immediately near any metal objects or devices that could
cause RF interference (other wireless systems, TVs, radio, etc.).
Adjust the squelch control setting. A higher squelch setting
provides better protection against interference but may also reduce
signal range. Choose a setting that most effectively mutes
interference yet allows the true signal to pass through. If poor signal
quality requires a higher squelch setting, try to eliminate the
interference or switch the transmitter/receiver channel to avoid a
loss of signal range.
Make sure the receiver and transmitter are within 200 feet (60
meters) and have a clear line of sight. Also, make sure the receiver
is not immediately near any metal objects or devices that could
cause RF interference (other wireless systems, TVs, radio, etc.).
Change the RF frequency and channel on both the transmitter and
receiver (to the same channel).
If you are using multiple transmitter-receiver pairs, use only one pair
at a time, or make sure the pairs are not using the same or adjacent
frequencies.
Adjust the squelch control setting. A higher squelch setting
provides better protection against interference but may also reduce
signal range. Choose a setting that most effectively mutes
interference yet allows the true signal to pass through. If poor signal
quality requires a higher squelch setting, try to eliminate the
interference or switch the transmitter/receiver channel to avoid a
loss of signal range.
Make sure the receiver is not immediately near any metal objects or
devices that could cause RF interference (other wireless systems,
TVs, radio, etc.).
Keep any connected audio cables away from the antennas.
Make sure no other devices are sending signals on the same RF
frequency and channel.
Change the RF frequency and channel on both the transmitter and
receiver (to the same channel).
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