Sennheiser SKM 9000 Instruction Manual page 52

Using the EM 9046
Booster
frequency
range B1 ... B8
Number of unused
frequency presets
Interference
zone LR
Interference
zone LR/HD
Interference
zone HD/LR
Interference
zone HD
Interference levels
of antenna A/B in
interference zone
Recommended
transmission mode
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.
please select booster range
2011-11-01 13:48:38
B1 B2 B3
40 40
40 40
40 40
40 35
630 654 654 678 670
Noise Level Zone HD HD/LR LR/HD LR
Interference Interference
levels of levels of
antenna A antenna B
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.
"HD"
"HD"
**
It might be that the transmission mode can only be used with a severely restricted range
freq scan
B4 B5 B6
40 40 40
40 40 40
35 40 40
27 36 29
694 694 718 710 734 734
Start scan
start full scan
Activated booster
frequency range
"HD/LR"
*
"LR" or "HD"
"HD" or "LR"
* Transmission mode can be used with a restricted range
B7 B8
40 38 34
40 37 32
40 37 32
6 26 31
758 750 774 774 798 MHz
active
RF IN A B
"LR/HD" "LR"
** *
"LR"
Digital 9000 | 51