Sennheiser ALK 83 portable infrared system

General Description

The Sennheiser ALK 83 is a portable infrared assistive listening kit to assist people who are hard-of-hearing. The system is supplied with everything needed to provide basic IR hearing support (up to 80 sq/m), and is stored in a heavy duty transport case.

The system comprises of a miniature Infra-Red radiator on a telescopic table stand, a sensitive condenser microphone with desktop microphone base, an induction neck loop IR receiver (for use with a hearing aid), a stethoset IR receiver (to be used by a non-hearing aid wearer), two-way charger, connection leads and a transport/storage case.

The system is very easy to use without any prior experience of the equipment. Each system is supplied with laminated user instructions.

Features

Quick to setup
Easy to use
Coverage up to 80 sq/m
Suitable for confidential meetings
Equality Act compliant

Delivery Includes

1 SI30PH modulator radiator
1 NT 20-1 UK power supply
1 HDI 830 stethoset receiver
1 EKI 830 with EZT 3011 neck loop
1 ME 34 cardioid mic capsule
1 MZH 3015 gooseneck microphone
1 2-way charger
1 IZK20 clamp
1 K&M table stand
1 protective storage case
1 line input cable
1 mic input cable
1 jack to twin phono cable
1 jack to jack cable

Technical Data

SI30 radiator
Modulation: FM
Nominal deviation: +/- 50 kHz
Carrier frequencies: 2.3 MHz + 2.8 MHz
Audio-XLR connector: 3pin-Texas- Socket
Input voltage range: 45 mV- 4V
Output impedance: 50 Ohm
IR Diodes: 11
Maximum coverage area: 80 m²
Effective radiated power: 0.5 W
Operating voltage (mains): 24-27 V DC
Current consumption: 180 mA
Dimensions: 118 x 25 x 90 mm
Weight: 140 g
RF output: 3.5 mm mono
Input voltage range: 45 mV.....4 V
NT 20-1 UK PSU
Output voltage: approx. 24 V DC  
Output current: approx. 200 mA
HDI 830 stethoset receiver
Modulation: FM, stereo
Receiving frequency: 2.3/2.8 MHz
Frequency response (headphones): 50 - 16,000 Hz
Max. Sound pressure level (active): 125 dB (1 kHz)
THD, total harmonic distortion: < 1 %
Signal-to-noise ratio typical: 75 dB (A)
Operating time (Accupack): up to 12 hrs
Charging time: approx. 3 hrs
Weight including Accupack approx.: 68 g
EKI 830 with EZT 3011 neck loop
Modulation: FM, stereo
Receiving frequency: 2.3/2.8 MHz
THD, total harmonic distortion: < 1 %
Signal-to-noise ratio typical: 75 dB(A)
Operating time (Accupack): up to 12 hrs
Charging time approx.: 3 hrs
Weight including Accupack approx.: 50 g
Dimensions: 70 x 60 x 26 mm
ME 34 microphone capsule
Transducer principle (Microphone): pre-polarised condenser microphone
Pick-up pattern: cardioid
Acoustics pressure gradient: transducer
Frequency response (microphone): 40 Hz - 20 kHz
Impedance: 50 Ohm
Min. terminating impedance: 1 kOhm
Maximum sound pressure level (passive): 130 dB SPL
Equivalent noise level: 26 dB (A)
Equivalent noise level: weighted as per CCIR 468-3 37 dB
Phantom powering: P12 - P48
Current consumption: 250 μA     
Dimensions: ø12 x L18 mm
MZH 3015 gooseneck microphone
Dimensions: 150 mm
Diameter: 6 mm
Weight: 73 g