Sennheiser SZI 1029-10-120, User Manual

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30 31
IR-Licht
Fremdlicht
IR-Licht
Fremdlicht
650
Grundfl
ä
che in m
2
x Anzahl der Kan
ä
le
Number of radiators (SZI 1029)
=
Number of radiators
(SZI 1029-10) =
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.
Extraneous light
IR light
Extraneous light
IR light
RADIATING POWER
Number of channels
Example: 12
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.
surface area in sq. m. x number of channels
1300
COMPUTING THE
During single channel operation (switch set to
MONO
), every
RADIATING POWER
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
approximately 35 % (see
RADIATING POWER DURING MULTICHANNEL
OPERATION
).
A simple formula facilitates the calculation of the number of radiators
necessary to irradiate a given room:
surface area in sq. m. x number of channels
RULE OF THUMB
PROPAGATION OF
The high power radiator SZI 1029 radiates the infra-red light in a lobar
INFRA-RED LIGHT
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.
110m
100m
90m
80m
70m
60m
50m
40m
30m
20m
10m
120m
130m
140m
150m
20
˚
10
˚
30
˚
40
˚
50
˚
60
˚
70
˚
80
˚
90
˚
20
˚
10
˚
30
˚
40
˚
50
˚
60
˚
70
˚
80
˚
90
˚
26dB
40dB