R38 240.16
(R43 976.18 incl VAT)
Short description:

UHF Plug on Transmitter


MTB40S is an extremely small and light plug-on transmitter especially designed for professional audio applications.

Very easy and quick to use thanks to OLED display, MTB40S benefit also of the latest Wisycom RF technology along with an enhanced robustness against noise and intermodulation.


  • Up to 232 MHz bandwidth in 470/798 MHz range
  • Enhanced robustness against self-interferences and antenna
  • performances thru a proprietary “intermodulation cancellation” circuit
  • Miniature design with flexible pcb (no connectors) for extended reliability
  • User selectable companding systems:
    • ENR (noise reduction) & ENC (voice quality optimized)
  • Input dynamic extension with an integrated HW limiter (30 dB above peak)
  • P48 phantom power for condenser microphones
  • New white OLED display
  • New XLR-3F connector with locking collar to ensuring an extremely tight noiseless fit!
  • Infrared interface for management and firmware update
  • Audio input circuitry with high linearity audio transformer
  • Battery: 2 AA Alkaline, rechargeable NiMH or Lithium


Switchable channels

2400 allocated by 40 groups of 60 channels (in specific frequency range), quickly selectable with dedicated buttons

Switching window

Up to 232 MHz, (see Variants below)


Quartz PLL  frequency synthesizer circuit (25 kHz step)

Frequency stability

  • ± 2,5 ppm (in the rated temperature range)

Temperature range

-10 ÷ +55 °C

Max RF power

  • 10 mW (ERP)
  • 50 mW (ERP)
  • [100 mW (ERP) (note: in some countries high power can be disabled, for local norm!)]

Spurious emissions

< 2 nW


wideband FM, with pre-emphasis

Nominal deviation

±40 kHz  (Peak deviation =  ±56 kHz)

Telemetry feature

MTB40S transmits also a digitally modulated sub-carrier, suitable for:

  • tone-squelch operating
  • remote battery monitoring

AF input connector

XLR-3F (transformer isolated) with locking collar and 48V phantom power

AF input level

100 dB adjustable range from -54 dBu (775 uV) to 46 dBu (15.5 V) at peak deviation (1 kHz), adjustable in 1 dB steps

Max. input level

+46 dBu (15.5 V) at clipping, +20 dBu (7.75 V) at nominal level


ENR  (Wisycom Extended-NR), with independent Attack- and Recovery-time, noise optimized

ENC (Wisycom Extended-NC), with independent Attack- and Recovery-time, voice optimized & with reduced pre-emphasys

AF bandwidth

  • 45 Hz ÷ 21 KHz (3dB)
  • 55 Hz ÷ 20 KHz (1dB)


< 0.3 %   (0.15 % typ.)

Signal-to-noise ratio

  • typ. 115 dB (A)rms  with 40 kHz deviation
  • typ. 121 dB (A)rms  with 56 kHz deviation


RGB Led indication (red, green and blue):

  • Wireless transmission status
    • Green when RF transmission power is on
    • Red when RF transmission power is off
    • Blue when the input signal is above the peak threshold
  • Battery lifetime status:
    • GREEN - steady (> 25%)
    • slowly blinking (< 25%)
    • quickly blinking (<12%)
  • Modulation peak (if activated & limiter disabled): RED


High contrast OLED (Organic light-emitting diode) white display (128 x 32 pixels)

8 step battery lifetime indication: 7 bars (100%-87%-75%-63-50%-38%-25%) and “empty bar” quickly blinking (12% remaining)

Power supply

2 AA size batteries (Alkaline, rechargeable NiMH or Lithium) – Phantom Power to Mic (max 4 mA)


124 x 40 x 34 mm (Height-Width-Depth)


Approx. 210 g. without batteries (250g with batt)

Datasheet (MTB40S_WIDEBAND_PLUG-ON_TRANSMITTER.pdf, 581 Kb) [Download]

Manual (WisyCom_MTB40_UM_2013-09-10_A5.pdf, 1,858 Kb) [Download]

Factory Lead time : 3 weeks

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