EM 3031 - Sennheiser Aviation Headsets

EM 3031
RF Wireless Systems | 3000 Series Receivers
EM 3031-U Cat. No. 009250
EM 3031-V Cat. No. 009278
General Description
The EM 3031 is a true diversity receiver in a 19” 1 U rack housing. 32 programmable
receiving frequencies ensure flexible channel selection and make this receiver an
ideal choice for OB applications or for use in shows.
Technical Data EM 3031-U
Type of receiver ................................. 32-channel receiver
Receiving frequencies .............................................max. 32
Frequency range........................................... 450–960 MHz
Switching bandwidth.............................................. 24 MHz
Modulation...................................................... wideband FM
Nominal/peak deviation ................ ± 40 kHz / ± 56 kHz
RF squelch ....................................... 0–100 µV, adjustable
Signal-to-noise ratio .................................. > 117 dB(A)rms
Noise reduction system ................................. HiDyn plus™
AF frequency response ............... 45–20,000 Hz (–3 dB)
THD (1 kHz) ........................................ ≤ 0.4 % (typ. 0.2 %)
RF inputs.............................................. 2 BNC sockets, 50 Ω
AF output voltage,
balanced XLR:............................. max. 18 dBU, adjustable
Headphone output.................... max. 12 dBU, adjustable
Output impedance..................................................... ≥ 50 Ω
Power supply ............... 115 / 230 V AC (+10 % / –15 %)
Housing .......................................................................19“, 1 U
Dimensions .......................................... 436 x 43 x 215 mm
Weight.............................................................approx. 3.5 kg
In compliance with ......................................... ETS 300 422
General Features
j Up to 32 programmable receiving frequencies per receiver
j Switching bandwidth max. 24 MHz (UHF) or 7 MHz (VHF)
j HiDyn plus™ noise reduction system with 117 dB(A)rms signal-to-noise ratio
j Multi-function LC display panel
j Indication of transmitter battery status (only with Sennheiser
transmitters transmitting battery status information)
j 19” 1 U metal housing with built-in mains power supply unit
j Suitable for multi-channel applications
EM 1031
j True diversity receiver, 19” 1 U housing
j LC display for frequency, RF and AF level
j Headphone output
j Delivery includes: 1 EM 3031 receiver, 2 telescopic antennas
1 mains cable, 19” rack mount ears
Technical Data EM 3031-V
Type of receiver ................................. 32-channel receiver
Receiving frequencies .............................................max. 32
Frequency range...........................................138–250 MHz
Switching bandwidth.................................................7 MHz
Modulation...................................................... wideband FM
Nominal/peak deviation ................ ± 40 kHz / ± 56 kHz
RF squelch ....................................... 0–100 µV, adjustable
Signal-to-noise ratio .................................. > 117 dB(A)rms
Noise reduction system ................................. HiDyn plus™
AF frequency response ............... 45–20,000 Hz (–3 dB)
THD (1 kHz) ........................................ ≤ 0.4 % (typ. 0.2 %)
RF inputs.............................................. 2 BNC sockets, 50 Ω
AF output voltage,
balanced XLR:............................. max. 18 dBU, adjustable
Headphone output.................... max. 12 dBU, adjustable
Output impedance..................................................... ≥ 50 Ω
Power supply ............... 115 / 230 V AC (+10 % / –15 %)
Housing .......................................................................19“, 1 U
Dimensions .......................................... 436 x 43 x 215 mm
Weight.............................................................approx. 3.5 kg
In compliance with ......................................... ETS 300 422
EM 3031/EM 3032
RF Wireless Systems | 3000 Series Receivers
The EM 3031 and EM 3032 receivers are fitted with an adjustable RF squelch, which
mutes the audio output when the antenna voltage drops below the chosen threshold. The squelch can be adjusted between 0 and approx. 100 µV. When the squelch
has been triggered, the “MUTE” warning will light up on the receiver display. The
receivers are additionally equipped with an AMF advanced muting function.
This muting function is triggered when the RF signal suddenly drops by approx.
50 dB. The receiver will then be muted for about 3 seconds to avoid the annoying
crackling noise which is caused when a transmitter is switched off.
The EM 3031 and EM 3032 receivers have a headphone output for monitoring the
incoming audio signal; the monitoring signal is mono. Sennheiser’s closed HD 25
headphones are an ideal choice for monitoring purposes. In order to enable monitoring even in unfavourable conditions (e.g. low AF signal level from the transmitter)
and with high ambient noise (on the stage, for example), the signal from the
headphone output is up to 30 dB louder than the LINE output signal. However, this
may lead to distortion if the level of the incoming signal is quite high and if the
volume control is turned up. In this case, turn back the volume until the distortion
disappears. If the sound remains distorted, the transmitter itself is overmodulated.
Mounting the telescopic antennas
The Sennheiser transmitter range includes many models which transmit battery
status information. The EM 3031 and EM 3032 receivers are able to receive this
status information. They display the remaining battery or accupack capacity of the
transmitter in %. When the battery is going flat and the remaining capacity lasts for
only 20 to 30 minutes of operation, the “LOW BATT” warning on the display starts
flashing. You should immediately replace the transmitter battery.
Using the cable grip for the mains cable
EM 3031
7 8
7
8
9
10
11
9 10 11 12 13
14
EM 3032
15
Fuse holder and mains voltage selector
Mains connector
Squelch control
Cable grip
Service interface (not used during normal operation)
Operating controls of the EM 3031 and EM 3032 – back panel
7 8
12
13
14
15
9 10 11 12 13
14
Balanced XLR-3 audio output
AF level control for audio output
Antenna socket B
Antenna socket A
9
11 12 13 15
EM 3031/EM 3032
RF Wireless Systems | 3000 Series Receivers
1
4
5
6
7
2
8
3
9
10
1
2
3
4
“FREQUENCY MHz” display
“CHANNEL” display
Alphanumeric main display
10-step level display for incoming RF signal,
with peak warning
5 10-step level display for incoming AF signal,
with peak warning
6 6-step display for transmitter battery status,
with “Low Batt” warning
7 Diversity antenna A active
8 Squelch active (MUTE)
9 Diversity antenna B active
10 Frequency groups display
Reading off the LC display
EM 3031 and EM 3032
With the EM 3031 single receiver and EM 3032 twin receiver, Sennheiser offers
two 19” high-quality RF receivers which have excellent operational reliability
and are extremely user-friendly. Combined with a suitable hand-held or bodypack
transmitter, they form a studio-quality radio link. Both receivers use true diversity
technology to reduce drop outs to an absolute minimum and ensure interferencefree operation.
Due to the wide switching bandwidth of the EM 3031 and EM 3032 receivers (24 MHz
for the UHF variant, 7 MHz for VHF) and due to their up to 32 receiving frequencies
you can easily switch to unused frequencies in case of interference on a selected
channel. The EM 3031 and EM 3032 receivers have been designed for demanding
show and broadcasting applications and are ideally suited for large multi-channel
systems.
With the GA 3030 AM antenna mount, the antenna sockets can be relocated at the
receiver front, for example if the rear of the rack is closed. If you need to choose
an antenna position away from the receivers, Sennheiser offers the A 12 AD UHF
active directional antenna or the A 1031-U passive omni-directional antenna for the
UHF range and the A 2 P passive omni-directional antenna for the VHF range. The
EM 3031 and 3032 receivers output the audio signal via an XLR-3 socket at the
rear. The level control serves to adjust the AF signal level and adapt it to the subsequent mixing console or amplifier.
The receiver display indicates the chosen receiving frequency or, optionally,
the channel number which it has been assigned. You can also read off the field
strength of the incoming RF signal in µV and the deviation of the audio signal (i.e.
the modulation level of the RF signal) in %. Both RF and AF display have a peak
warning in case the signal strength becomes excessively high. Short peak periods
are not critical. If, however, the audio signal is overmodulated very often and for
quite some time, the sensitivity of the transmitter must be reduced. The AF display
is additionally provided with a “peak-hold” function, i.e. peak values are displayed
for some time so that it becomes easier to detect them.
EM 3031
1 2
1
2
3
EM 3032
3
4 5 6
1/4” headphone output jack socket
Volume control for headphone output
Multi-function LC display
Operating controls of the EM 3031 and EM 3032 – front panel
1 2
4
5
6
m
3
.
4 5 6
1 2
3
and buttons for selecting the receiving
frequency/channel number
SET button for menu selection and storage
On/off switch
4 5 6
EM 3031/EM 3032
RF Wireless Systems | 3000 Series Receivers
436 mm
215 mm
43 mm
EM 3031 / EM 3032 dimensions
Accessories for EM 3031 and EM 3032
j GA 3030 AM antenna mount
j A 12 AD UHF active directional antenna (for -U)
j A 1031-U passive omni-directional antenna (for -U)
j A 2 P passive omni-directional antenna (for -V)
j GZA 1036-9 ground plane antenna
j GZA 1036-TV ground plane antenna (for -U)
j N/BNC adaptor
j RG 58 co-axial antenna cable
GZL 1019 A1 (1 m)
GZL 1019 A5 (5 m)
GZL 1019 A10 (10 m)
j GZV 1019A BNC coupler
j AS-X custom-built active antenna splitter
j ASA 3000-EU active antenna splitter
j ASA 3000-UK
j ASA 3000-US
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