Sennheiser Digital 9000, Instruction Manual

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Digital 9000 | 39
Preparing the Digital 9000 system for use
Preparing the A/AB/AD 9000 antennas and/or
antenna boosters for use
Antennas and antenna boosters of the Digital 9000 series are available in
two variants: A1–A8 and B1–B8.
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Select the booster variant (A1–A8 or B1–B8) whose frequency range
matches that of your transmitters:
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Use two A 9000 receiving antennas or two AD 9000 receiving antennas
or two passive antennas together with AB 9000 antenna boosters:
If both antenna boosters are connected or replaced, the EM 9046 automat-
ically measures the cable attenuation between the antenna boosters and
the antenna inputs and compensates for it. During the measurement, the
channel status display displays “Calibrating” for each channel. If only one
antenna booster is connected or replaced, the cable attenuation will not be
measured. You can also manually initiate the compensation of the cable
attenuation (see ““Cable attn” – Displaying the cable attenuation and
automatically compensating for it” on page 64).
Positioning the receiving antennas
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Position the receiving antennas in the same room in which the transmis-
sion takes place! Maintain a minimum distance of 1 m between the two
receiving antennas/antenna boosters and a minimum distance of 50 cm
between the antennas/antenna boosters and metal objects (including
reinforced concrete walls).
Booster variant A1–A8
470–638MHz
B1–B8
630–798MHz
Booster frequency
ranges
A1 A2 A3 A4 A5 A6 A7 A8 B1 B2 B3 B4 B5 B6 B7 B8
Bandwidth
MHz
47
0–4
94
49
4–5
18
51
0–5
34
53
4–5
58
55
0–5
74
57
4–5
98
59
0–6
14
61
4–6
38
63
0–6
54
65
4–6
78
67
0–6
94
69
4–7
18
71
0–7
34
73
4–7
58
75
0–7
74
77
4–7
98
Transmitter
type A1–A4
470–558 MHz
type A5–A8
550–638 MHz
type B1–B4
630–718 MHz
type B5–B8
710–798 MHz
Product name Type Radiation pattern
A 9000 active, intelligent omni-directional
AD 9000 active, intelligent directional
AB 9000 antenna booster depending on the passive antenna
used
CAUTION
Material damage and personal injury due to tipping/dropping
of the antennas!
If you do not protect the antennas against tipping/dropping,
they can cause material damage and personal injury.
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Use safety wires to protect the receiving antennas against tip-
ping/dropping. The safety wires, rope terminations and cou-
pling links must comply in their dimensioning and condition
with the regulations and standards of the country in which
they are used!