1) Insert the BNC adapter into the hole provided
on the bracket and fasten it .
2) Connect the antenna to the front jack of the
adapter .
3) Use a 50 Ω BNC cable to connect the rear jack
of the adapter to one of the antenna jacks (9)
on the rear of the unit .
Two plastic caps are supplied to cover the holes if
the antennas are not attached to the rack brackets .
5 Switching on / off
To switch the receiver on / off, keep the button
POWER (6) pressed for approx . 1 second .
If the receiver is not in use for a longer period
of time, disconnect the power supply unit from the
mains socket . Even when the receiver is switched
off, the power supply unit has a low power con-
sumption .
6 Settings
Use the buttons SET, AUTO,
settings on the receiver .
6.1 Automatic lock function
When no button is pressed, the buttons SET, AUTO,
and
will be locked automatically approx .
15 seconds after switching on ( on the display) .
To unlock the buttons, keep the button SET
pressed for approx . 1 second .
settings can be made via the buttons SET, AUTO,
and
. To lock the buttons after the settings have
been made, keep the button SET pressed again .
The buttons will also be locked automatically a
short while after the last operation .
6.2 Setting of radio frequency, squelch,
transmission power and gain
When the buttons are unlocked (
use the button SET to select the functions one after
another . When the last function has been reached
and the button SET is pressed again, the setting
mode will be exited:
Group setting channel setting squelch setting set-
ting of transmission power for the transmitter gain setting
for the transmitter exit of setting mode
The indication of the function selected starts flash-
ing . As long as it keeps flashing, settings can be
made with the buttons
If no button has been pressed for a few sec-
onds, the setting mode will be exited automatically .
However, any setting made will also be saved in
this case .
and
(5) to make
will disappear and
☞
chapter 6 .1),
and
.
6.2.1 Radio frequency
GR
CH
The radio frequency is defined by the channel
group and the channel (
1) Use the button SET to select the function "group
setting" (group indication starts flashing) and
the button
2) Then use the button SET to select the function
"channel setting" (channel indication starts
flashing) and the button
nel . The corresponding radio frequency will be
indicated on the display .
When multiple wireless systems TXS-1800 are oper-
ated in parallel, it is recommended to use channels
from the same group . Under optimum operating
conditions, up to 8 channels of a group may be
operated at the same time without mutual inter-
ference . To quickly find free channels in a group
see chapter 6 .3 .
6.2.2 Squelch
indication "squelch"
The squelch threshold is adjustable in three levels .
The squelch function will mute the receiver when
the level of the radio signal received falls below
the threshold value adjusted . Thus, high-frequency
interference signals will not cause noise at the re-
ceiver when the transmitter is switched off or when
the transmission power is insufficient: If the levels
of the interference signals are below the threshold
value, the receiver will be muted .
A high threshold value offers high interference
resistance, but it will also reduce the transmission
range of the wireless system since, during opera-
tion, the strength of the transmitter signal must
be high enough to prevent muting of the receiver .
Thus, when the reception 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
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 synchronization
indications "group" and "channel"
☞
table on page 13) .
or
to set the group .
or
to set the chan-
starts flashing)
or
to set the level (3 levels
11