Audio Ltd. miniTX User Manual

User Guide
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
Switch iR ™, 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.
Controls, display
and connections
Top panel
Audio
input socket
Top panel
Audio
input socket
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
(red)
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 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 12dB 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
miniTX transmitter
Infra-red
Antenna
port
Infra-red
port Antenna
Sleep/Low battery
(orange)
Sleep/Low battery
(orange)
microphones. Position 9 gives maximum gain and each
position decreases the gain by approximately 3 to 4dB,
giving a total of 30dB of adjustment.

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
(4-pin Lemo version only).
•
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 LF cut filter.
•
Check the battery status.
These steps are explained below:

Fitting the batteries

Open the battery compartment by turning
the battery cover 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 sleeve.
Close the battery cover and tighten the battery
cover retaining nut in a clockwise direction.
Take care not to over tighten.
The miniTX has reverse battery protection.

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.
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