11
Setting Up and Using Your
UM1 System
9. Set the UM1 Meter switch to “RF.” One or more segments in the UM1 meter should
light. If the “HIGH” segment lights, the UM1 is receiving an optimally strong RF signal and
is placed and positioned correctly. If the “LOW” segment lights (indicating a relatively weak
RF signal), try relocating the UM1 or changing the position of one or both of its antennas.
10. If you want to use headphones to monitor the transmission, connect a standard
“Walkman”-type 30 ohm headphone to the UM1 headphone output and adjust the Level
control until the desired level is reached.
11. Turn on your connected amplifier and/or mixer but keep its volume all the way down.
Next, make sure that your transmitter is unmuted by setting its Audio switch to “On.” If you
are using the UH1 transmitter or if you are using the UT1L transmitter with a connected
lavalier microphone or headset, speak or sing into the mic at a normal performance level
while slowly raising the volume of your amplifier/mixer until the desired level is reached.
If you are using the UT1G transmitter with a connected instrument, play the instrument at
normal performance level while slowly raising the volume of your amplifier/mixer until the
desired level is reached. If you are using a UT1L belt-
pack transmitter equipped with a lavalier microphone,
note that correct lavalier placement is critical to sound
quality. We recommend that you place it as shown in
the illustration on the right—as close to your mouth as
possible but off to one side (to minimize nasality) and
unobstructed by clothing. Bear in mind also that
omni
microphones (mics which pick up signal from all
directions) are more prone to feedback problems than
unidirectional (cardioid or hypercardioid) ones; in
general, you can avoid feedback by taking care not to
use any microphone directly in front of a PA speaker
(if this is unavoidable, try using an equalizer to
attenuate those high- or mid-range frequencies which
are causing the feedback “squealing”).
12. If you hear distortion at the desired volume level, first check to see whether the red
“Peak” LED on the UM1 is lit. If it is not, make sure that the gain structure of your audio
system is correctly set (consult the owners manual of your mixer and/or amplifier for
details). If the red “Peak” LED
is lit, do the following:
• If you are using a UH1 transmitter, use the supplied plastic screwdriver to turn its
Microphone Input Level control (trimpot) slowly counterclockwise (towards the “Min”
position) until the distortion disappears.
• If you are using a UT1L transmitter with connected lavalier microphone or headset, its
Audio Input Level control has been factory preset to provide optimum level for the
particular lavalier or headset model being used and so no adjustment should be
necessary. Any distortion present should therefore simply be a matter of the
microphone being too close to the mouth; try moving it further away. If this does not
solve the problem, use the supplied plastic screwdriver to turn the Audio Input Level
control (trimpot) on the UT1L slowly counterclockwise until the distortion disappears.
• If you are using a UT1G transmitter with an instrument such as electric guitar or bass,
lower the output level of the instrument until the distortion disappears. Alternatively,
you can use the supplied plastic screwdriver to turn the Level control (trimpot) on the
UT1G slowly counterclockwise until the distortion disappears.
