Audio MINITX User Manual
2040 User Guide
DX2040 portable true diversity receiver – page 3
miniTX miniature pocket transmitter – page 7
TX2040 pocket transmitter – page 14
HX2040 handheld transmitter – page 20
SwitchiR infrared remote control – page 26
Control-X transmitter controller – page 28
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CHAPTER
1
DX2040
. . . . . . . . . . . . . . . . . . . . . . . .
The DX2040 true diversity receiver in the RMS2040 range
can be used with the TX2040 pocket transmitter and the
HX2040 handheld transmitter. It is also fully compatible with
the TX2020 and TX2000 UHF transmitters. All settings on the
DX2040 receiver can be read or changed via infra-red using
the SwitchiR or AudiR© for Palm™.
miniTX
. . . . . . . . . . . . . . . . . . . . . . . .
The miniTX transmitter is the smallest transmitter in the
Audio Ltd range. Designed as a rounded form to be very
easily concealed. All settings can be set and changed via
the infra-red port using the SwitchiR™, and the miniTX
can also be turned on and off through clothing using
the Control-X. There are two versions of the transmitter
available: one with a 4-pin Lemo connector and the other
with a 3-pin Lemo connector.
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.
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.
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
1
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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.
Control-X
. . . . . . . . . . . . . . . . . . . . . . . .
The Control-X uses electromagnetic induction to allow the
miniTX or 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.
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.
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CHAPTER
2
Controls, display and connections
. . . . . . . . . . . . . . . . . . . . . . . .
Bottom panel
Battery
compartment
Identification
plug
On/off switch
Battery compartment
Holds two 1.5v AA (LR6) type cells.
On/Off
Switches the power on or off. Additionally the output cable
includes a link which disconnects power when the Lemo
plug is removed, in which case the switch can be left on.
Identification plug
Can be fitted with one of the coloured rubber plugs supplied
with the DX2040 to identify each unit.
Top panel
Antenna A
No signal
Audio
output
Antenna B
Infra-red port
TX low
battery
DX low
battery
Audio output
Provides transformer balanced microphone level and
adjustable headphone outputs.
Antenna A and Antenna B
SMA sockets to which the antennae are connected.
Indicators next to each antenna indicate which of the unit’s
two built-in receivers is active at any time.
Infra-red port
Receives commands from and transmits status information
back to the SwitchIR infra-red controller.
DX2040 Receiver
The DX2040 true diversity receiver in the RMS2040 range can be used with the TX2040 pocket transmitter and the
HX2040 handheld transmitter. It is also fully compatible with the TX2020 and TX2000 UHF transmitters. All settings on
the DX2040 receiver can be read or changed via infra-red using the SwitchiR or AudiR© for Palm™.
DX2040 Receiver
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TX/DX low battery indicators
Illuminate when the unit detects low battery power in either
the TX2040 Pocket Transmitter or DX2040 Receiver. The units
should not be used when a low battery power indicator is
illuminated as poor operation may result.
Note: The low DX battery indicator does not function when
the receiver is externally powered via Audio Ltd’s cables.
This is not a fault.
No-signal indicator
Illuminated when no carrier signal is being received, such
as when the transmitter is switched off or set to an incorrect
frequency.
Setting up the DX2040
To set up the DX2040 in conjunction with a TX2040 or HX2040:
• Fit the batteries.
• Connect the A and B antennae.
• Connect the audio output cable.
• Slide the On/Off switch to the On position.
• Select the operating frequency.
• Set the output level.
• Check that one of the A and B indicators is illuminated
and that the red ‘No signal’ indicator is not illuminated.
These steps are explained below:
Fitting the batteries
To open the battery compartment, slide the release catch
towards the centre of the DX2040 and flip open the cap.
Insert two 1.5 volt AA (LR6) type batteries, negative contact
first as shown on the side of the unit, and close the cover. Do
not use excessive force.
Connecting the antennae
Connect the antennae to the SMA connectors marked
Antenna A and Antenna B. Connect the straight antenna to
one socket and the right-angled antenna to the other socket.
Selecting the operating frequency
You can check or change the operating frequency of the
DX2040 receiver via infra-red control using the SwitchiR.
To check the DX2040 frequency:
• Press MENU.
The display shows:
FREQUENCY
MHz
Fr
• Align the front of the SwitchiR with the infra-red port on
the receiver and press OK.
Optimum operating range is between 5 and 15cm.
The SwitchiR will display the
receiver frequency; for example:
FREQUENCY
Rx MHz
854.900
To change the DX2040 frequency:
• Press OK again.
The display will alternately flash between frequency and
channel number.
DX2040 Receiver
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For example:
CHANNEL
01
• Press a or v to scroll through the 32 frequencies read
from the receiver until the required channel or frequency
is displayed.
For example:
CHANNEL
32
• Align the front of the SwitchiR with the infra-red port on
the receiver and press OK.
If the command was received correctly the display will show
the new frequency.
For example:
FREQUENCY
Rx MHz
857.950
Otherwise the display will show:
Error
• Repeat the above steps if an error message is displayed,
moving the SwitchiR closer to the infra-red port.
Setting the output level
The DX2040 output level is attenuated in 1dB steps over a
32dB range, allowing the receiver output to be matched to
inputs which require a lower input level. The 0dB reference
level is -25dBu.
To check the DX2040 output level:
• Press MENU.
• Press a once until
the display shows:
AF LEVEL
TxRx
AF
• Align the front of the SwitchiR with the infra-red port on
the receiver and press OK.
The display will show the current
output level setting; for example:
AF LEVEL
Rx
-07 dB
To change the receiver output level:
• Press the OK button.
The AF level display will flash.
• Press the a or v button to step between the available
output level settings until the required output level is
displayed.
For example:
AF LEVEL
TxRx
-15 dB
• Align the front of the SwitchiR with the infra-red port on
the receiver and press OK.
If the command was received correctly the new level will be
displayed.
For example:
AF LEVEL
TxRx
-15 dB
Otherwise the display will show:
Error
DX2040 Receiver
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• Repeat the above steps if an error message is displayed,
moving the SwitchiR closer to the infra-red port.
Checking the DC power status
To check the status of the receiver’s DC power:
• Press MENU.
• Press a three times until
the display shows:
TxRx
BAtt
• Align the front of the SwitchiR with the infra-red port on
the receiver and press OK.
The display will
show the DC voltage:
Rx
2.7 v
If the associated transmitter is on while the DC status
is being checked the display will alternate between the
receiver’s DC status and the received transmitter DC status.
For example:
Tx
H
The transmitter status is shown as one of the following
options:
Option Description
H (high) Indicates good.
L (low) Indicates low. Replace as soon as possible.
F (failed) Transmitter will not function correctly.
External powering
Audio Ltd has a large selection of cables available for a
variety of different applications. If the DX2040 receiver is to
be externally powered, ensure that the appropriate cable is
used.
Technical specification
. . . . . . . . . . . . . . . . . . . . . . . .
Frequency range
470MHz–1000MHz
Number of frequencies
32 pre-programmed
Switching bandwidth
Up to 24MHz
Sensitivity
-98dBm for 40dB SINAD
Balanced output level
-25dBu
Frequency response
50Hz to 18kHz ±1dB
THD
<0.2% typical
Batteries
2 x 1.5V AA (LR6) type
Battery life
> 4 hours on good alkaline batteries
Size
147 x 64 x 20mm
Weight
250g
Operating temperature
range
-20°C to +55°C
Compliant to
ETS 300422 EN 300445(CE) FCC
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CHAPTER
3
Controls, display and connections
. . . . . . . . . . . . . . . . . . . . . . . .
Top panel
Audio
input socket
Infra-red
port
Sleep/Low battery
(orange)
Antenna
On/Overload
(red)
Infra-red port
Receives commands from and transmits status information
back to the SwitchiR infra-red controller, or AudiR for Palm.
On/Overload indicator (red)
Flashes on momentarily to indicate an overload in the
presence of a high-level audio signal. At this point, the low
distortion limiter operates.
Sleep/Low battery indicator (orange)
Flashes every two seconds when the transmitter is in sleep
mode. Remains on when the battery is low.
Battery compartment
Holds two AAA type 1.5V alkaline or lithium batteries.
Audio input
Allows a microphone or input cable to be connected via a 4-
pin Lemo connector, or 3-pin Lemo connector on an optional
variant.
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.
miniTX
The miniTX transmitter is the smallest transmitter in the Audio Ltd range. Designed as a rounded form to be very
easily concealed. All settings can be set and changed via the infra-red port using the SwitchiR™, and the miniTX
can also be turned on and off through clothing using the Control-X. There are two versions of the transmitter
available: one with a 4-pin Lemo connector and the other with a 3-pin Lemo connector.
miniTX Transmitter
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Setting up the miniTX
. . . . . . . . . . . . . . . . . . . . . . . .
To set up the miniTX:
• Fit the batteries.
• 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 batteries
• Open the battery compartment by turning the battery
compartment retaining nut in an anti-clockwise direction.
• Rotate the battery cover in either direction.
• Insert two AAA (LR03) type batteries as shown in the
diagram on the miniTX cover.
• Close the battery compartment and tighten the battery
compartment retaining nut in a clockwise direction. Take
care not to over tighten.
An electronic resettable fuse protects the transmitter from
reverse powering.
Low battery indication
When the battery is low the orange LED will remain on. The
miniTX should not be used when the battery is low as poor
operation may result. A low transmitter battery indicator
is also provided on the DX2040 receiver and on the RK2040
rack.
Note: On the miniTX fitted with the 3-pin Lemo connector,
the transmitter will switch on as soon as the batteries have
been fitted to the transmitter. To maximize battery life the
miniTX should be put into sleep mode by turning the miniTX
off using the SwitchiR.
Connecting the antenna
• Connect the flexible antenna to the SMA connector.
Switching on
• Insert the microphone plug.
The red LED illuminates momentarily under the top cover to
indicate that the transmitter has been turned on.
miniTX Transmitter
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Switching off
To turn the transmitter off remove the Lemo plug, or put the
miniTX in sleep mode by switching it off using the SwitchiR.
Alternatively the miniTX can be turned off or on, even
through clothing, using the Control-X.
In sleep mode the orange LED will flash every two seconds
and the transmitter will draw very little current.
Connecting the audio input
• Connect the microphone or input cable to the four-pin
Lemo socket.
A positive microphone bias voltage is provided, enabling the
majority of modern lavalier microphones to be used with the
miniTX.
Selecting the operating frequency
You can check or change the operating frequency of the
miniTX 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 miniTX 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 miniTX 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.
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