Audio Limited TX2040 User manual

2040 User Guide

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CHAPTER
1
TX2040
........................
The TX2040 is a pocket transmitter that provides 32 pre-
programmed frequencies with a switching bandwidth of up
to 24MHz. The transmitter can be switched on and off, even
when it is worn beneath clothing, using the unique Control-X
handset. It is also compatible with the SwitchiR infra-red
controller, and AudiR™ application Palm PDA.
Control-X
........................
The Control-X uses electromagnetic induction to allow the
TX2040 transmitter to be controlled remotely, even through
clothing. At a distance of up to 20cm (8") the Control-X can
switch on and off the transmitter, or check and display
the selected frequency, and it also provides battery check
features.
SwitchiR
........................
The SwitchiR is an infra-red remote control unit the size of
a key fob, which can be used to access all the user-settable
functions of the TX2040 and HX2040. Functions include
transmitter frequency, audio level, battery status, serial
number, and user identification.
HX2040
........................
The HX2040 is a handheld transmitter designed in a classical
conical shape, designed to accept any of 14 condenser
capsules from the Schoeps™ Colette range.
The transmitter has 32 pre-programmed frequencies with
up to 24MHz switching bandwidth, and it includes a unique
infra-red remote control interface for reliable and accessible
control over settings via the SwitchiR or AudiR™ application
for Palm PDAs.
RK2040
........................
The RK2040 is a compact 1U rack capable of
accommodating up to four true diversity receivers. The
RK2040 can be mains powered via an AC/DC adaptor, or can
be powered from any 10-18V DC source. A built-in RS485 PC
interface allows remote monitoring and control via Audio
Ltd’s PC-based monitoring application, Racktop.
Introduction
The 2040 range has been designed as a result of extensive feedback from professional sound specialists and sets a
new benchmark for radio microphone systems, with several unique features and offering benefits to appeal to sound
mixers, directors, and artists.

CHAPTER
2
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Controls, display and connections
........................
Top panel
Antenna
On (green)
Overload (orange)
Infra-red
port
Audio
input socket
On/Reset button
Infra-red port
Receives commands from and transmits status information
back to the SwitchiR infra-red controller.
On/Overload indicator
The LED glows green while the TX2040 is switched on, but
will flash orange to indicate an overload in the presence of a
high-level audio signal. At this point the low distortion limiter
operates.
Brown reset button
Resets the TX2040 and turns it on again from sleep mode.
Please use the tip of the antenna to press the button.
Battery compartment
Holds a 6LR61 type 9V alkaline battery.
Audio input
Allows a microphone or input cable to be connected.
SMA antenna connector
SMA socket to which the antenna is connected.
LF cut using SwitchiR
Gives approximately 6dB LF cut at 50Hz, to assist in the
reduction of wind noise.
Gain setting using the SwitchiR
Provides eight gain options when used with standard
microphones. Position 9 gives maximum gain and each
position decreases the gain by approximately 3 to 4dB,
giving a total of 30dB of adjustment. Positions 1 and 0
provide line-level input.
TX2040 Pocket Transmitter
The TX2040 is a small, lightweight battery-powered pocket transmitter for use with a wide range of lapel
microphones. All settings can be read and changed via the infra-red port using the SwitchiR™.

TX2040 Pocket Transmitter
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The following table gives the equivalent settings for the
TX2020:
TX2040 0 1 2 3 4 5 6 7 8 9
TX2020 8 9 0 1 2 3 4 5 6 7
Note: Positions 0 and 1 (8 and 9 on the TX2020) provide line-
level input.
Setting up the TX2040
........................
To set up the TX2040:
• Fit the battery.
• Connect the antenna.
• Switch on by plugging in the microphone or input cable.
• Check or select the operating frequency.
• Check that the receiver’s no signal indicator is not
illuminated.
• Check or set the microphone gain.
• Check or set the low frequency cut filter.
• Check the battery status.
These steps are explained below:
Fitting the battery
• Press and slide open the battery compartment door.
• Insert a 6LR61 type 9V alkaline battery with its contacts
facing downwards observing the polarity as shown on the
sleeve.
• Push the battery down against the spring-loaded contacts
and slide the battery compartment door closed, pushing
against the spring-loaded contacts.
Do not use excessive force:
+
_
An electronic resettable fuse protects the transmitter
from reverse powering. A low transmitter battery indicator
is provided on the RK2040 receiver and on the TX2040
transmitter.
Connecting the antenna
• Connect the flexible antenna to the SMA connector.
Switching on
• Insert the microphone plug.
The LED illuminates green and the transmitter turns on. To
turn the transmitter off remove the lemo plug. Alternatively

TX2040 Pocket Transmitter
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the TX2040 can be turned off or on, even through clothing,
using the Control-X.
The LED flashes green when the battery voltage falls below
6.5V. The unit should not be used when the battery is low as
poor operation may result.
Connecting the audio input
• Connect the microphone or input cable to the six-pin
Lemo socket.
Both positive and negative microphone bias voltages are
provided, enabling the majority of Lavalier microphones to
be used with the TX2040.
Selecting the operating frequency
You can check or change the operating frequency of the
TX2040 via the infra-red control using the SwitchiR.
To check the frequency:
• Press MENU.
The display shows:
FREQUENCY
MHz
Fr
• Align the front of the SwitchiR with the infra-red port on
the TX2040 and press OK.
The display shows the current
frequency; for example:
FREQUENCY
Tx MHz
854.900
To change the frequency:
• Press OK.
The display will alternately flash between showing the
frequency and channel number.
For example:
CHANNEL
01
• Press a or v to scroll through the 32 frequencies read
from the transmitter until the desired frequency or
channel is displayed.
For example:
CHANNEL
32
• Point the SwitchiR at the infra-red port on the TX2040 and
press OK.
If the command was received successfully the display will
show the new set frequency.
For example:
FREQUENCY
Tx MHz
857.950
Otherwise it will show:
Error
• Repeat the above steps if an error message is displayed,
moving the SwitchiR closer to the infra-red port.
Setting the gain
The steps between gain settings 2-9 are approximately 3
to 4dB. Set the gain position so that the Overload indicator
does not flash on during normal operation.