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Infra-red two-channel modulator for Sennheiser infrared receivers, supporting cordless sound transmission.
Highlights automatic on/off, operation indicator, mode selection, volume control, and RF output for radiators.
Lists compatible Sennheiser receivers including RI 150, RI 250, RI 300, HDI 302, and HDI 380.
Position modulator high and ensure diodes point at receivers, avoiding obstruction of the light path.
Connect the NT 20 plug-in mains unit to the SI 30's power supply socket (S), observing plug orientation.
Use the AF cable to connect the AF input (N) on the SI 30 to the sound source's headphone socket.
Connect infra-red radiators (SZI 1029, SZI 1015, SZI 30) to socket (Z) for larger room coverage.
Set sound source volume to a medium value, referring to TV manual for headphone socket volume.
Selects carrier frequency (Mono Ch 1/2 or Stereo) using switch (B) at the rear.
No physical switch; green LED indicates operation. Low standby consumption; unplug when not in use.
Modulator activates with audio signal and powers off after 3-4 minutes of no signal.
Package contains 1 SI 30 modulator, AF cable with 3.5mm plug, and a 3.5mm/1/4" jack adapter.
Optional accessories like the NT 20 mains unit and SZI 30 radiators can be ordered separately.
General| Frequency Range | 863 - 865 MHz |
|---|---|
| Channels | 2 |
| Power Supply | 12 V DC |
| Modulation | FM |
| Audio Inputs | 3.5 mm jack |
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