Automatic Channel Scan; Establishing A Transmission Path - IMG STAGELINE TXS-1820 Mode D'emploi

6.2.2 Squelch
indication "squelch""
The squelch threshold is adjustable in three
levels . The squelch function will mute the re-
ceiver when the level of the radio signal re-
ceived falls below the threshold value adjusted .
Thus, high-frequency interference signals will
not cause noise at the receiver when the trans-
mitter is switched off or when the transmission
power is insufficient: If the levels of the inter-
ference signals are below the threshold value,
the receiver will be muted .
A high threshold value offers high inter-
ference resistance, but it will also reduce the
transmission range of the wireless system since,
during operation, the strength of the trans-
mitter signal must be high enough to prevent
muting of the receiver . Thus, when the recep-
tion is good, a high threshold value can be
used; however, when the transmitter and the
receiver are far apart, a low threshold value is
recommended .
Use the button SET to select the function
"squelch setting" (indication
and the button or to set the level (3 levels
 
displayed = highest threshold value) .
6.2.3 Settings for the transmitter
indications
"transmission power" and "gain"
These settings apply to the transmitter of the
wireless system . During frequency synchro-
nization ( ☞ chapter 7, step 2), they will be
transferred to the transmitter . However, it is
also possible to set the transmission power and
the gain on the transmitter itself .
1) The transmission power is adjustable in
three levels . When the transmission power
is reduced, the power consumption will also
be reduced . Thus, the battery life will be
longer, but the transmission range will be
shorter . Use the button SET to select the
function "setting of transmission power"
(indication starts flashing) and the but-
ton or to set the level (3 levels dis-
 
played = highest transmission power) .
2) The gain setting can be used to reduce the
microphone sensitivity (for wireless micro-
phone TXS-1800HT) or the sensitivity of the
microphone input (for pocket transmitter
TXS-1800HSE) and thus to readjust the vol-
ume level of the transmitter . Use the button
SET to select the function "gain setting" (in-
dication starts flashing) and the button
or to set 0 dB, −3 dB or −6 dB .
 

6.3 Automatic channel scan

With the automatic channel scan, the receiver
will find a free channel within the channel
group adjusted ( ☞ chapter 6 .2 .1) . To oper-
ate multiple wireless systems TXS-1800 at the
same place at the same time: Before perform-
ing a channel scan, switch on the transmitters
that have already been set to a radio frequency
so that the channels already being used will be
skipped during the channel scan .
Unlock the buttons ( chapter 6 .1) and
☞
press the button AUTO to start the scan . Dur-
ing the scan, the display will indicate the radio
frequencies of the group consecutively, the in-
dication
segments of the channel indication will keep
rotating . At the end of the scan, the radio fre-
quency found and the corresponding channel
number will be indicated on the display .
6.4 Setting the output level
Unlock the buttons (
the button

receiver . The value adjusted will briefly appear
on the display (
display indicates the radio frequency again .
7 Establishing a
Transmission Path
To establish the transmission path for a system
consisting of a receiver and a transmitter, pro-
ceed as follows:
1) Set the radio frequency on the receiver
( chapter 6 .2 .1, chapter 6 .3) . Do not
☞
switch on the corresponding transmitter
starts flashing)
yet . If the transmitter is still switched off
and the bargraph RF on the display (4)
indicates a signal, interference or signals
from another wireless system are received .
In this case, use a different radio frequency .
2) Switch on the transmitter and open its battery
compartment so that the IR sensor is not
covered . Aim the IR sensor at the IR trans-
mitting diode (2) of the receiver . Make sure
that there are no obstacles between the
IR sensor and the IR transmitting diode (dis-
tance up to approx . 2 m) .
For frequency synchronization, press
the button ADL (3): The transmitter will be
matched to the radio frequency of the re-
ceiver by IR signal . The transmission power
and the gain setting (
will also be transferred to the transmitter .
During IR transmission, the wave symbol in
the indication
successful transmission, the display of the
transmitter will light up for a few seconds .
Note: The radio frequency, transmission power
and gain can also be set manually on the trans-
mitter .
3) When the receiver and the transmitter have
been set to the same radio frequency, an
antenna symbol will light up in one of the
two antenna indications A or B on the dis-
play of the receiver (depending on which of
the two separate receiver sections receives
the radio signal of the highest quality at this
moment) and the bargraph RF will indicate
that a radio signal is being received .
In case of no reception or poor reception,
please check the following items:
a) Are the batteries of the transmitter dis-
charged? Both on the display of the
receiver and on the display of the trans-
mitter, a battery symbol indicates the
battery status .
b) Are there any metal objects or other high-
frequency sources interfering with re-
ception?
c) Is it possible to improve the reception
quality by turning the receiving antennas?
will keep flashing and the numeric
☞ chapter 6 .1) and use
or to set the output level of the

... ) before the
chapter 6 .2 .3)
☞
will pulsate . To indicate
d) Are the receiver and the transmitter too
far apart? The range depends on local
conditions (up to approx . 100 m in the
open) . The transmission path should be
free of any obstacles .
e) Is the squelch too high and / or the
trans mission power too low?
( ☞ chapter 6 .2 .2 or 6 .2 .3)
4) To control the level of the wireless system,
switch on the subsequent audio unit or
raise the corresponding control of the mixer
and speak / sing into the microphone of the
transmitter:
Transmitter
The volume level of the transmitter is indi-
cated on the bargraph AF of the receiver . It
is adjustable via the gain setting . The gain
setting can either be made on the transmit-
ter or on the receiver (
☞
When it is made on the receiver, transfer
it to the transmitter by IR signal (see step 2
above) .
Receiver
To set the output level of the receiver see
chapter 6 .4 . The signal of the receiver
is present at the corresponding output
CHANNEL 1 or CHANNEL 2 (9) . This signal,
mixed to the signal of the second receiver,
is also present at the common outputs
2 IN 1 MIX (8) .
8 Specifications
Radio frequency range: � � 1785 – 1800 MHz
☞ table on page 2
Audio frequency range: � � 60 – 16 000 Hz
Dynamic range: � � � � � � � � > 95 dB
THD: � � � � � � � � � � � � � � � � < 0�8 %
Interference suppression: � pilot tone and
adjustable squelch
Audio outputs
CHANNEL 1/ 2 (bal�): � � � 2 × XLR, 50 mV
2 IN 1 MIX (bal�): � � � � � � 1 × XLR, 80 mV
2 IN 1 MIX (unbal�): � � � � 1 × 6,3 mm jack, 50 mV
Antenna connections: � � � BNC, 50 Ω
Power supply: � � � � � � � � � via power supply unit
provided and connected
to 230 V/ 50 Hz
Ambient temperature: � � � 0 – 40 °C
Dimensions (W × H × D): � 410 × 47 × 175 mm
Weight: � � � � � � � � � � � � � � 2�1 kg
Subject to technical modification .
All rights reserved by MONACOR
GmbH & Co. KG. No part of this instruction manual
may be reproduced in any form or by any means for
any commercial use.
chapter 6 .2 .3) .
INTERNATIONAL
®
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