Sennheiser RI 150 User Manual

RI 150

Infrared Wireless Systems | Receivers

General Description

The RI 150 is an extremely lightweight wideband stethoset receiver which uses the carrier frequency 2.3 MHz, thus offering excellent transmission reliability. It features an easy-to-operate on/off/volume control and is powered by the environmentally friendly BA 151 rechargeable NiMH accupack delivered with the receiver.

	Technical Data
	Modulation ..........................................	wideband-FM, mono
	Carrier frequency ......................................................	2.3 MHz
	AF frequency response...............................	18 – 18,000 Hz
	THD...................................................................................	< 1 %
	Signal-to-noise ratio ............................................	typ. 70 dB
	Max. SPL .............................................................	appx. 110 dB
	Operating time ....................................................	appx. 6 hrs
	Weight incl. battery ......................................	approx. 1.6 oz.

Features

Wideband stethoset receiver

Extremely reliable transmission due to carrier frequency 2.3 MHzExtremely lightweight – only 1.6 oz.

Excellent speech intelligibility and good music reproductionVery easy to use

Operates on environmentally friendly rechargeable NiMH accupack

Delivery includes: 1 x RI 150 mono stethoset receiver, 1 x BA 151 accupack

Recommended Accessories
BA 151 accupack	Cat. No. 004146
Charger for two BA 151
L 151-2-120 USA version	Cat. No. 004459
L 151-10 charging unit for 10 receivers	Cat. No. 004494
Plug-in mains unit for one L 151-10
NT 92-120 USA version	Cat. No. 003358
Plug-in mains unit for two to five L 151-10
NT 2013-120USA version	Cat. No. 003434
Replacement earpads, black, firmer version	Spare Part No. 037080
Replacement earpads, transparent, softer version	Spare Part No. 040949

5.3”

Dimensions of the RI 150

7.4”

	5”
.7
0

RI 150

RI 150

Infrared Wireless Systems | Receivers

Apertures for altering the frequency response

Two IR receiving diodes (behind special plastic cover)

Inserted BA 151 On/off/volume accupack control

RI 150 stethoset receiver

The RI 150 mono receiver works on the extremely reliable carrier frequency 2.3 MHz, offering excellent speech intelligibility and good music reproduction due to its wide frequency response. A built-in squelch avoids loud hiss when the signal from the IR radiators is too weak, for example when a receiver is used outside the radiator coverage area. The RI 150 is an elegantly shaped receiver which is very easy to use: the only control the wearer has to operate in order to hear the transmitted signals is a combined on/off/volume control with a small position indicator for reading off the volume.

The receiver is powered by the environmentally friendly BA 151 NiMH accupack. For domestic applications, the L 151-2 charger is the optimum choice: it is designed for two BA 151 accupacks and comes complete with mains unit. For professional applications, Sennheiser has designed the L 151-10 charging unit. It can recharge up to ten BA 151 directly in the receivers, as the accupack charging contacts are located on the outside. Alternatively, you can also charge BA 151s separately, e.g. in case you have spare accupacks. The L 151-10 requires the NT 92 plug-in mains unit, which can be ordered separately in the version you require (European, UK or USA versions available).

The L 151-10 can also be cascaded: up to five charging units can be joined by means of the cascading bars fixed to the bottom of the units. Two to five cascaded L 151-10 are powered by an NT 2013 (or NG 2013-UK) plug-in mains unit. The recharging of the receivers is carried out automatically and takes 10 hours. After that, the charging unit switches to trickle charging.

Excellent ease of operation: The user has only to operate the on/off/volume control

Three cascaded L 151-10 charging units with NT 2013 (or NG 2013-UK) plug-in mains unit and receivers

Sennheiser Electronic Corporation

One Enterprise Drive, Old Lyme, CT 06371

Tel: [phone] • Fax: [phone] www.sennheiserusa.com