Sennheiser EM 100, EM 300, EM 500 Service Manual
Service
EM 100
EM 300
EM 500
Part 1
Sennheiser electronic GmbH & Co. KG • D-30900 Wedemark • Tel. 0 51 30 / 600-0
Änderungen vorbehalten / Subject to alterations / Sous réserve de modification
EM 100, EM 300, EM 500
05/00 – 1
TECHNISCHE DATEN
(Werte in Klammern entsprechen typischen Werten)
HF-TEIL
Frequenzbereiche____________________________________________ 518 ... 550 MHz
630 ... 662 MHz
740 ... 772 MHz
790 ... 822 MHz
838 ... 870 MHz
Empfängerprinzip ____________________________________________ True Diversity
Schaltbandbreite ____________________________________________ 32 MHz
Empfangsfrequenzen ________________________________________1280
Kanalabstand _______________________________________________ > 400 kHz
Frequenzraster ______________________________________________ 25 kHz
1. Oszillatorfrequenz _________________________________________ fe - 110,6 MHz
1. Zwischenfrequenz _________________________________________ 110,6 MHz
2. Oszillatorfrequenz _________________________________________ 121,4 MHz
2. Zwischenfrequenz _________________________________________ 10,8 MHz
Modulationsart ______________________________________________ Breitband-FM
Nennhub ___________________________________________________ 24 kHz
Spitzenhub _________________________________________________ 48 kHz
Schaltschwelle der Rauschsperre ______________________________ 0 µV ... 100 µV
S/N=80 dB (unbewertet mit HDX) _____________________________ < 10 µV (6 µV)
S/N max (Spitzenhub mit HDX) ________________________________ > 110 dB(A) (117 dB(A))
Antenneneingänge __________________________________________ HF-Eingang: 2x BNC 50 Ω
NF-TEIL
Kompandersystem __________________________________________ HDX
NF-Ausgangsspannung (Nennhub) _____________________________ 500 mV
NF-Ausgangsspannung (Spitzenhub) ___________________________ unsymmetr. 1,3 V
; EM 300: 770 mV
eff
4 dBu;EM 300: symmetr. 2,6 V
eff
eff
Klirrfaktor bei 1 kHz und Nennhub _____________________________ < 1% (0,3%)
NF-Frequenzgang____________________________________________50 Hz ... 18 kHz; -3dB
Pegel des Monitorausgangs / Last _____________________________ ausschließlich EM 500: >100 mW / 32 Ω
Steckverbinder ______________________________________________ NF-Ausgang: 6,35 mm Klinke;
EM300/EM 500 zusätzlich XLR 3 Stecker
ALLGEMEIN
Nennspannung ______________________________________________ 12 V
Betriebsspannung ___________________________________________ 10,5 ... 16 V
Stromverbrauch bei Nennspannung ____________________________ typ. 150 mA
Ruhestromaufnahme ________________________________________ typ. 10 mA
Zulassung __________________________________________________D801 488L RF
10 dBu
eff
EM 100, EM 300, EM 500
05/00 – 2
Änderungen vorbehalten
TECHNICAL DATA
(Values in brackets are typical values)
RF STAGE
Frequency ranges____________________________________________ 518 ... 550 MHz
630 ... 662 MHz
740 ... 772 MHz
790 ... 822 MHz
838 ... 870 MHz
Diversity system ____________________________________________ True Diversity
Switching bandwidth_________________________________________32 MHz
Receiver frequencies ________________________________________ 1280
Channel spacing _____________________________________________ > 400 kHz
Channel grid ________________________________________________ 25 kHz
1st oscillator frequency _______________________________________fe - 110.6 MHz
1
intermediate frequency ____________________________________ 110.6 MHz
st
oscillator frequency _______________________________________ 121.4 MHz
2
nd
2
intermediate frequency____________________________________10.8 MHz
nd
Modulation _________________________________________________Wideband FM
Nominal deviation ___________________________________________ 24 kHz
Peak deviation ______________________________________________ 48 kHz
Squelch threshold ___________________________________________0 µV ... 100 µV
S/N=80 dB (unweighted with HDX) ____________________________ < 10 µV (6 µV)
S/N max (peak deviation with HDX) ____________________________ > 110 dB(A) (117 dB(A))
Connectors _________________________________________________ RF input: 2x BNC 50 Ω
AF STAGE
Compander system __________________________________________ HDX
AF output voltage (nominal deviation) __________________________500 mV
AF output voltage (peak deviation) _____________________________ unbalanced 1.3 V
; EM 300: 770 mV
eff
4 dBu;EM 300: balanced 2.6 V
eff
eff
10 dBu
eff
THD at 1 kHz and nominal deviation____________________________< 1% (0.3%)
AF-Frequency response ______________________________________ 50 Hz ... 18 kHz; -3dB
Monitor level / load __________________________________________exclusive EM 500: >100 mW / 32 Ω
Connectors _________________________________________________ AF output: 6.35 mm jack; EM300/EM 500 additional XLR 3 jack
GENERAL
Nominal supply voltage_______________________________________12 V
Operating voltage ___________________________________________ 10.5 ... 16 V
Current consumption at nominal voltage ________________________ typ. 150 mA
Stand-by current_____________________________________________typ. 10 mA
Approbation ________________________________________________ D801 488L RF
Subject to alterations
EM 100, EM 300, EM 500
05/00 – 3
EM 100, EM 300, EM 500
SIGNALFLUSSZUWEISUNG
INTERCONNECTOR ASSIGNMENT
EM 100, EM 300, EM 500
05/00 – 4
EM 100, EM 300, EM 500
GRUNDPLATINE, BLOCKSCHALTBILD
MAINBOARD, BLOCKDIAGRAM
EM 100, EM 300, EM 500
05/00 – 5
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