Samson CONCERT 77 UM1 MICRO DIVERSITY SYSTEM Mode D'emploi page 13

Setting Up and Using Your UM1 System
13. Conversely, if you hear a weak, noisy signal at the desired volume level, again 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 it is and the signal coming from the UM1 is still weak and/or noisy,
do the following:
• If you are using a HT7 transmitter, use the supplied plastic screwdriver to turn the Level
control (trimpot) on the transmitter slowly clockwise (towards the "Max" position) until the
signal reaches an acceptable level.
• If you are using a CT7 transmitter with connected lavalier microphone or headset, its Level
control has been factory preset to provide optimum level for the particular lavalier or head-
set model being used and so no adjustment should be necessary. Any weakness of signal
should therefore simply be a matter of the microphone being too far from the mouth; try
moving it closer. If this does not solve the problem, use the supplied plastic screwdriver
to turn the Level control (trimpot) on the CT7 slowly clockwise until the signal reaches an
acceptable level.
• If you are using a CT7 transmitter with an instrument such as electric guitar or bass, raise the
output level of the instrument until a good signal is achieved. Alternatively, you can use the
supplied plastic screwdriver to turn the Level control (trimpot) on the CT7 slowly clockwise
until the signal reaches an acceptable level.
14. Temporarily turn down the level of your mixer/amplifier system and turn off the power to
your transmitter, leaving the UM1 on. Then restore the previously set level of your mixer/ampli-
fier. With the transmitter off, the receiver output should be totally silent—if it is, skip ahead
to the next step. If it isn't (that is, if you hear some noise), you may need to adjust the UM1 SQ
(squelch) control, located in the battery compartment. When the SQ control is at its minimum
setting, the UM1 system always provides maximum range without dropout; however, depend-
ing upon the particular environment your system is used in, you may need to reduce that range
somewhat in order to eliminate band noise when the transmitter is turned off. To do so, use the
provided screwdriver to rotate the SQ control completely counterclockwise (to the "Min" posi-
tion), then slowly turn it clockwise until the noise disappears. If no noise is present at any posi-
tion, leave it at its fully counterclockwise "Min" position (so as to have the greatest overall range
available).
15. When first setting up the UM1 system in a new environment, it's always a good idea to do a
walkaround in order to make sure that coverage is provided for your entire performance area.
Accordingly, turn on both the transmitter and UM1 receiver. If you are using a video camera, use
the supplied velcro strip to attach the UM1 to the side of the camera. If not, physically place the
UM1 in the position in which it will be used. Next, with the transmitter unmuted, walk through
the entire area that will need to be covered while speaking, singing, or playing your instrument.
As you do so, you will find that the orange "A" and "B" LEDs on the UM1 occasionally switch on or
off, always showing you which antenna is receiving the stronger signal. The basic rule of thumb
for all wireless audio systems is to always try to minimize the distance between transmitter and
receiver as much as possible and also to try to maintain "line of sight" between the two (that is,
the person using the transmitter should be able to see the receiver). Always try to minimize the
distance between transmitter and receiver as much as possible so that the strongest possible sig-
nal is received from all planned transmission points.
If you have followed all the steps above and are experiencing difficulties, contact your local dis-
tributor or, if purchased in the United States, call Samson Technical Support (1-800-372-6766)
between 9 AM and 5 PM EST.
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