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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 → setting
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 seconds,
the setting mode will be exited automatically. How-
ever, 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
indications "group" and "channel"
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
or
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
operated 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
interference. 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
receiver 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
the button
or
to set the level (3 levels dis-
played = highest threshold value).
table on page 13).
to set the group.
or
to set the chan-
starts flashing) and
GB
11
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