Propagation Of Infra-Red Light; Impact Of Extraneous Light; Radiating Power; Radiating Power During Multi-Channel Operation - Sennheiser SZI 1029-EU User Manual

IMPACT OF EXTRANEOUS LIGHT

Daylight and artificial light in a room also have an impact on the IR
reception. Since the spectrum of this light also contains infra-red portions
it can interfere with the useful signal radiated by the SZI 1029. At worst,
the reception is disturbed by hissing noise.
Fremdlicht
Extraneous light
IR-Licht
IR light
Fremdlicht
Extraneous light
IR light
IR-Licht

RADIATING POWER

RADIATING POWER DURING
(Not for SZI 1029-T models) The number of transmitted channels has
MULTI-CHANNEL OPERATION
an impact on the radiated power of the infra-red radiator SZI 1029.
The power is uniformly divided in such a way that, for instance, in a
system with 12 narrow-band channels only 1/12 of the desired radiating
power is available for each audio channel.
30
COMPUTING THE
RADIATING POWER
RULE OF THUMB
PROPAGATION OF
INFRA-RED LIGHT
Number of channels
Example: 12
During single channel operation (switch set to
SZI 1029 radiator will supply an area of about 1000 sq.m.
The SZI 1029-10 radiators are able to supply approximately double
this area.
When switched to narrow-band multi-channel operation (switch set to
MULTI
) power output and thus irradiated area are reduced by
RADIATING POWER DURING MULTICHANNEL
approximately 35 % (see
OPERATION
).
A simple formula facilitates the calculation of the number of radiators
necessary to irradiate a given room:
Grundfl che in m
surface area in sq. m. x number of channels ä
=
Number of radiators (SZI 1029)
surface area in sq. m. x number of channels
(SZI 1029-10) =
Number of radiators
The high power radiator SZI 1029 radiates the infra-red light in a lobar
shape. With increasing distance the intensity becomes weaker. When a
receiver leaves the irradiated area the transmission is interrupted. Recei
vers without squelch will produce a hissing noise, receivers with squelch
will mute.
10
150m
˚
140m
20
˚
130m
120m
110m
100m
90m
30
˚
80m
40dB
70m
40 60m
˚
50m
50
˚
40m
30m
60
˚
20m
70
˚
10m
80
˚
90
˚
MONO
), every
x Anzahl der Kan le
2
ä
650
1300
10
˚
20
˚
26dB
30
˚
40
˚
50
˚
60
˚
70
˚
80
˚
90
˚
31