Tour Guide System - Audio Conference System
$389.95
General Description
Six channel digital RF bodypack receiver. Offers automatic on/off, easy volume and channel selection. Includes an internal integrated rechargeable battery. Features a 3.5 mm audio output for connection of induction neckloop or headphones.
Features
- Digital RF signal transmission
- Intuitive operating concept
- 16 hours battery life
- Free choice of headphones or induction loop
- Backlit LC display
- Sturdy housing
Tour Guide System - Audio Conference System
$389.95
Technical Data
| Modulation |
2 FSK |
| RF frequency range |
926 - 928 MHz |
| Number of channels |
6 |
| Total harmonic distortion (THD) |
<1% at 10 mW |
| Headphone connector |
max. 10 mW/32Ω |
| Impedance |
min. 32Ω |
| Operating time (Accupack) |
approx. 16 h |
| Power supply |
lithium-polymer-battery, 1500 mAh |
| Operating temperature |
0 - 50°C |
| Dimensions |
3.9 x 2.4 x 0.9 in (98 x 61 x 24 mm) |
| Weight incl. Accupack |
2.8 oz (78 g) |
Tour Guide System - Audio Conference System
$389.95
Recommended Accessories
| Part/Accessory |
Article No. |
| GP 3000-L |
005224 |
Lanyard for EK 2020-D-US bodypack receiver
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| L 2021-40 |
502037 |
Rack-mountable charger for (40) HDE 2020-D-US or EK 2020-D-US receivers. Includes software for receiver configuration (such as channel settings). Interface for software control and networking.
|
Tour Guide System - Audio Conference System
$389.95
Variants
$389.95
Glossary
| Impedance |
| Impedance expresses the AC resistance of a microphone or a set of headphones. It is dependent on frequency and is given at 1 kHz as the so-called nominal impedance. Impedance is measured in ohms. In recent years, an industrial standard has developed, setting the impedance of headphones at 50 or 600 ohms. Sennheiser headphones are manufactured according to this standard, thus practically ruling out connection problems. With microphones, the input impedance of the following microphone amplifier should have at least three times the value of the nominal impedance, in order to prevent it from unnecessarily attenuating the microphone signal. |
| Modulation |
| The process in which one wave is varied by some parameter of another wave, for example, an RF carrier frequency that is modulated by an audio signal. Types of modulation include amplitude modulation, frequency modulation, pulse code modulation and pulse width modulation. |
| Number of channels |
| Frequencies which are available to transmit a signal. |
| Operating temperature |
| Gives the range of temperatures at which a unit can be operated without damage. |
| Operating time (Accupack) |
| Indicates the operating time with a new, fully charged accupack. |
| Power supply |
| Description of the power source used for powering a unit, for example mains, battery, rechargeable accupack, etc. |
| RF frequency range |
| The range of frequencies to which a unit (e.g. a receiver) can be tuned. |
| Total harmonic distortion (THD) |
| Total harmonic distortion is a measure of non-linear harmonic distortion and is given in %. Non-linear harmonic distortions are signals which were not present in the original before the signal was converted by the headphones. These unwanted signals are caused by the diaphragm, whose movements do not precisely move in time with the electric signals that cause it to move. Unfortunately, this is a feature of all electroacoustic transducers. Although it cannot be completely eliminated, suitable steps can be taken to minimise it. However, the user is not interested in why this distortion takes place but in how great the level of distortion must be for it to become perceptible. According to the findings of several research projects, a total harmonic distortion of 1% in the frequency range of 100 to 2000 Hz is imperceptible. Below 100 Hz, the perceptibility threshold lies at 10%. |
