Digital 9000
| 51
Using the EM 9046
The interference levels received by the antennas are recorded and dis-
played. The interference levels are divided into four interference zones:
“
HD
”, “
HD/LR
”, “
LR/HD
” and “
LR
”. The lower the zone, the lower the
received interference level.
In addition, the number of unused frequency presets is displayed per
booster frequency range and per interference zone. The number of unused
frequency presets depends on the number, the height and the frequency
of the received interference levels.
The selection of a suitable booster frequency range depends on several
factors:
• Required number of transmission links
• Sufficient number of unused frequency presets
• Sufficient number of transmitters of the correct type (in this example,
transmitters of type B1–B4 or B5–B8, see page 34)
• Recommended transmission mode “
HD
” or “
LR
”:
“
HD (High Definition)
”: Transmission of an audio signal without audio
data compression. As a result, the audio signal remains pure and
unadulterated. In “
HD
” transmission mode, the range can be restricted
compared to “
LR
” transmission mode.
“
LR (Long Range)
”: Transmission of an audio signal whose bit rate is
reduced – before transmission – by an audio data compression tech-
nique (SeDAC, Sennheiser Digital Audio Codec). This compression tech-
nique provides excellent audio quality and a large transmission range.
The sensitivity to interference is reduced compared to “
HD
” transmis-
sion mode.
start full scan
please select booster range
B8
B7
B6
B5
B4
B3
B2
B1
RF IN
A
B
active
630
654 654
678 670
694 694
718 710
734 734
758 750
774 774
798 MHz
Start scan
HD
Noise Level Zone
LR/HD
HD/LR
LR
40
40
40
40
40
40
40
35
40
40
35
27
40
40
40
36
40
40
40
29
40
40
40
6
38
37
37
26
34
32
32
31
Interference
levels of
antenna A
Interference
levels of
antenna B
Number of unused
frequency presets
Activated booster
frequency range
Booster
frequency
range B1 ... B8
Interference
zone LR
Interference
zone LR/HD
Interference
zone HD/LR
Interference
zone HD
2011-11-01 13:48:38
freq scan
Interference levels
of antenna A/B in
interference zone
“
HD
”
“
HD/LR
”
“
LR/HD
”
“
LR
”
Recommended
transmission mode
“
HD
”
“
HD
”
*
or “
LR
”
“
LR
” or “
HD
”
**
“
LR
”
*
* Transmission mode can be used with a restricted range
**
It might be that the transmission mode can only be used with a severely restricted range