Setting The Transmission Channel; Setting The Mixing Ratio Of The Microphone Signals; Adjusting The Interference Suppression - IMG STAGELINE TXS-646 Manual De Instrucciones

3) The XLR jacks MIC OUT (12) of the four
receiver sections can be connected to four
microphone inputs of a mixer or amplifier .
To use the mixed signal of the four
receiver sections, feed the mixed signal
from the jack LINE OUT (13) to a line
input . For setting the mixing ratio, see
chapter 4 .3 .
4) Connect the power supply unit provided to
the power supply jack DC INPUT (14) and
to a mains socket (230 V/ 50 Hz) .
5) To switch on the receiver, keep the button
POWER (9) pressed until the displays (1)
light up .
To switch off the receiver, keep the
button pressed until OFF appears on the
displays . The power supply unit has a low
power consumption even when the re-
ceiver is switched off; therefore, discon-
nect the power supply unit from the mains
socket when the receiver is not operated
for a longer period of time .
6) The other settings of the receiver section
are described in the following chapters .
Make the settings one after the other for
each receiver section (RECEIVER 1– 4) .

4.2 Setting the transmission channel

Scan a free transmission channel automati-
cally or set it manually . Then simply press a
button to set the wireless microphone via IR
signal to the same channel .
1) To automatically scan a free receiving
channel, keep the button ACT (5) pressed
until the display indicates the scan mode
( ) . After a short period of time, the dis-
play will show the number of the channel
found . The corresponding frequencies can
be found in the table on pages 16 / 17 .
2) To manually set a specific transmis-
sion frequency, see the table on pages
16 / 17 for the corresponding channel
group and channel number .
a) Press the button SET (6) once: The dig-
its for GROUP will start flashing on the
display .
b) As long as the digits keep flashing (for
a few seconds after the button SET, 
or  was pressed), use the button  or
 (7) to set the channel group .
Note: If the digits stop flashing before the
group has been set, press the button SET
again .
c) To set the channel number, press the
button SET repeatedly until the digits
for CHANNEL start flashing .
d) Use the button  or  to set the chan-
nel number . The channel setting will be
saved as soon as the digits stop flashing .
3) If the indicator ANTENNA A or B (2) lights
up when the wireless microphone is still
switched off, interference signals or signals
from another wireless system are being re-
ceived . In this case, set a different channel .
4) Switch on the wireless microphone and
point the infrared sensor of the wireless
microphone towards the IR LED (4) of the
receiver section (see instruction manual of
the wireless microphone, if required) . The
distance must not exceed 1 .5 m and there
must be no obstacles between the sensor
and the IR LED .
Briefly press the button ACT (5) . The
display backlight of the wireless micro-
phone is activated; the wireless micro-
phone and the receiver section are set to
the same channel .
5) When the receiver section and the wire-
less microphone have been set to the
same transmission channel, the indicator
ANTENNA A or B (2) – depending on the
antenna that receives signals of higher
strength – on the receiver section will
light up . If none of the indicators lights
up, please check the following:
1 . Are the batteries of the wireless micro-
phone discharged?
2 . Are there any metal objects interfering
with reception in the transmission path?
3 . Is it possible to improve the reception
quality by turning the receiving anten-
nas?
4 . Is the distance between the receiver and
the wireless microphone too long?
5 . Is the interference suppression adjusted
with the control SQUELCH (11) too
high? (chapter 4 .4)
4.3 Setting the mixing ratio of
the microphone signals
The mixed signal of the four receiver sections
is available at the jack LINE OUT (13) . To set
the mixing ratio of the individual signals, the
volume of the four microphone signals can be
separately changed: First adjust the signal to
be reproduced at the highest volume; this will
also adjust the output level of the jack LINE
OUT to the input of the subsequent unit . Then
add the other microphone signals .
1) Switch on the audio unit that follows the
receiver or advance the corresponding
mixer control .
2) Press the button SET (6) three times: The
digits for VOL will start flashing .
3) Speak/Sing into the microphone, and as
long as the digits keep flashing (for a few
seconds after the button SET,  or  was
pressed), use the button  or  (7) to
adjust the volume (range 00 – 63) .
Note: If the digits stop flashing before the setting
has been made, press the button SET three times
again .
4) The setting will be saved as soon as the
digits stop flashing .
All rights reserved by MONACOR
may be reproduced in any form or by any means for any commercial use.
4.4 Adjusting the interference
suppression
Use the control SQUELCH (11) to set the
threshold value at which the interference sup-
pression is to be activated . The interference
suppression will mute the receiver section in
speech/music pauses when interfering signals
are received and the levels of these signals
are below the threshold value adjusted . A
high threshold value, however, will reduce
the transmission range of the microphone
system as the receiver section will also be
muted when the strength of the radio sig-
nal falls below the threshold value adjusted .
Therefore, adjust a high threshold value (turn
the control towards MIN) when the reception
is good and a low value (turn the control to-
wards MAX) when there is a long distance
between the wireless microphone and the
receiver .
5 Specifications
Carrier frequencies: � � � � � 672�000 – 696�975 MHz
RF S/N ratio: � � � � � � � � � � 105 dB
Audio frequency range: � � 30 – 18 000 Hz
Dynamic range: � � � � � � � � 120 dB
THD: � � � � � � � � � � � � � � � � < 0�5 %
Audio outputs
MIC OUT (1 – 4): � � � � � � 25 mV, 600 Ω, XLR, bal�
LINE OUT (Mix): � � � � � � 350 mV, 600 Ω, 6�3 mm
Power supply: � � � � � � � � � via power supply unit
Ambient temperature: � � � 0 – 40 °C
Dimensions (W x H x D: � � 482 × 45 × 310 mm,
Weight: � � � � � � � � � � � � � � 2�9 kg
Subject to technical modification .
® INTERNATIONAL GmbH & Co. KG. No part of this instruction manual
channels see table on
pages 16 / 17
jack, unbal�
provided and connected
to 230 V/ 50 Hz
(1 RS)
7