The miniTX transmitter

Small is beautiful

Ergonomically designed

Weighing just 90 grams including batteries, the MiniTX measures only 82mm high by 48mm wide and is a mere 16.5mm thick. Its small size means it’s easy to hide under even tight clothing and its rounded corners make it comfortable to wear.

It might be small but it is not lacking in performance. The MiniTX offers 32 pre-programmed frequencies, with a switching bandwidth of up to 24 MHz (the equivalent of 3 European, 4 U.S. TV channels) and is programmed and controlled using the SwitchIR infra red remote control.


The miniTX is powered by 2 x 1.5v AAA batteries and can run for up to 5 hours on standard alkaline batteries batteries or up to 7 hours on lithium batteries.


SwitchiR infrared controlled

This unit is controlled by the SwitchiR, a key-fob sized Infrared remote control. Using the SwitchiR’s four buttons and LCD display, the unit can be switched on and off, frequencies checked and changes and battery levels monitored – all without ever needing to touch the unit itself.

miniTX Specifications

Frequency range 470 - 960 MHz (specify at time of order)
Switching bandwidth Up to 40 MHz in 25 kHz steps
Number of frequency tables 1
Number of factory pre-set frequencies 32
Modulation Mode Wideband FM
Frequency stability ±0.002%
Audio frequency response 50 – 18 kHz
Signal-to-noise ratio >100 dB (±45 kHz deviation)
Total harmonic distortion <0.3% typ.
Output Power 25 mW nominal (50 mW option available)
Audio gain control 0-30 dB (in 8 steps)
LF cut 2 settings; flat, 80 Hz
Input connector Lemo™ 4 pin locking (3 pin option available)
Control Infra-red key-fob remote
Battery type 2 x 1.5V Alkaline LR3 AAA size
Battery life 5 to 7 hours depending on battery type
Audio Ltd recommend use of NiMh
Operating temperature range -20°C to +55°C
Weight 98 grams (including batteries)
Dimensions 48mm (W) x 82mm (H) x 16.5mm (D)
Optional Accessories Flexible clear antennae straight
Neoprene Pouch

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