Sennheiser SZI 1029 dimensions Coverage Area and Polar Diagrams, Multi-ChannelOperation

SZI 1029

IR Audio Transmission Technology Modulators/Radiators

10˚	150m	10˚
20˚	140m
	130m
		26dB
	120m
	110m
	100m
30˚	90m
	80m
		40dB
	70m
40˚	60m
	50m

50˚	40m
60˚	30m
70˚	20m
80˚	10m
90˚

Polar diagram of the SZI 1029*

10˚	225m	10˚
20˚	210m
	195m
	180m	26dB
	165m
	150m
30˚	135m
	120m
	105m	40dB
40˚	90m
	75m

50˚ 60m

	Coverage Area and Polar Diagrams
	The coverage area of the SZI 1029 and SZI 1029-10 high-power radiators depends
20˚	on the number of channels transmitted (see also “Multi-Channel Operation”).
	For single-channel applications, the coverage area is up to approx. 800 m2 for the
	SZI 1029 and up to 1,600 m2 for the -10 variant. The chapter “Practical Planning”
	has already given you some basic information on the recommended number and
	position of radiators. Please bear in mind that the devices radiate directionally, i.e.
	reception outside the radiation angle is only possible if the signal is reflected by
30˚	walls and ceilings.
	The polar diagram on the left is that of the SZI 1029. You can see that the signal-
	to-noise ratio decreases the further you go away from the radiator. Eventually,
40˚	the noise becomes so loud in relation to the useful signal that the squelch in the IR
	receiver mutes the audio output. A signal-to-noise ratio of 26 dB (the outer charac-
50˚	teristic in the polar diagrams) gives an intelligible but noisy signal. A signal-to-noise
60˚	ratio of > 40 dB, on the other hand, ensures a clear audio signal without the annoy-
	ing noise.
70˚
80˚	To cover a room more evenly, you can mount your radiators at one point and align
90˚	them at an angle to one another. In the polar diagram on the left, two SZI 1029 have
	been mounted at an angle of 40° to each other. For more information on how to
	work with polar diagrams, please refer to the chapter on “Planning Theory”.
	Multi-Channel Operation
20˚	All SZI 1029 models are suitable for multi-channel transmissions provided that a
	suitable modulator is used. The radiator coverage area, however, decreases propor-
	tionally with the number of channels the radiator is transmitting. If, for example,
	your system transmits eight narrow-band channels, the radiating power is uni-
	formly divided between all eight channels. The coverage area is reduced to 1/8th of
	the area achieved in single-channel operation and a 5-W radiator, for example, will
30˚	cover 100 m2 instead of the 800 m2 in single-channel operation.
40˚
50˚

60˚	45m
70˚	30m
80˚	15m
90˚

Polar diagram of the SZI 1029-10*

	m2
60˚	800
70˚	600
80˚	400
90˚
	200
	0

										m2
										1600
										1200
										800
										400
1	2	3	4	5	6	7	8	9	10 11 12	0
										Channels

1 2 3 4 5 6 7 8 9 10 11 12 Channels

10˚

20˚

30˚

150m

140m

130m

120m

110m

100m

90m

80m

70m

60m

50m

40m

30m

20m

10m

10˚

20˚

30˚

4

26dB

40dB

40°

Coverage area of the SZI 1029 Coverage area of the SZI 1029-10

Polar diagram of two SZI 1029, mounted at an angle of

40° to each other* *free field, extraneous light < 100 lx, single-channel operation