10
Cautions and Troubleshooting
Feedback
Avoid acoustic feedback (howling or
screeching) by taking care in selecting
PA volume, transmitter location and
speaker placement.
Please also note the pickup pattern
characteristics of the microphone selected.
Unidirectional microphones are more
resistant to feedback. However, they pick
up sound sources best that are directly in
front of the microphone. Also Microphones
that are farther from the sound source
require more acoustic gain and thus are also
more prone to feed back than close-source
microphones such as handheld.
no or low audio
If you are not getting audio through the
system, carefully re-check all setups.
Especially note that the receiver and
transmitter must be set to operate on the
same RF channel. For UH/UB-3 transmitters,
also confirm that the Power Switch is not in
the MUTE position. The receiver’s balanced
Line Level Out is adjustable so make sure
the Output Volume Control is set properly.
rF Interference and Finding Open Channels
The FCC mandates the following information be provided to all end users of this equipment:
Consumer alert
Most users do not need a license to operate this wireless microphone system. Nevertheless,
operating this microphone system without a license is subject to certain restrictions: the system
may not cause harmful interference; it must operate at a low power level (not in excess of 50mW);
and it has no protection from interference received from any other device. Purchasers should also
be aware that the FCC is currently evaluating use of wireless microphone systems, and these rules
are subject to change.
For more information, call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC)
or visit
www.fcc.gov/cgb/consumerfacts/wirelessmic_factsheet.html
.
If you encounter slight receiving interference
when the transmitter is far from the receiver
(from other than an operating TV station
on the same frequency), interference on
a selected channel with the transmitter
off, you must replace the receiver and
transmitter to a different channel.
Please note that wireless frequencies are
shared with other radio services. According
to FCC regulations, wireless microphone
operations are unprotected from
interference from other licensed operations
in the band. If any interference is received
by any Government or non-government
operation, the wireless microphone must
cease operation or change frequencies.
The above statement is valid only for use
in the U.S.A.
Note:
The VR-3U’s
reCeIVeD SIGnal (3)
icon
indicates good signal strength in operation with
the transmitter on, but with the transmitter off
also indicates the presence of likely RF interfering
signals at that location. If this happens, select
a different channel. It is ideal to have no LED lit
for interference-free operation.
Frequency Plan:
Channel Frequency
MU4
493.55 MHz
MU5
495.55 MHz
MU6
509.55 MHz
