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Table of Contents
- 1 RF Frequencies Always Enter through the Microphone Cable
- 2 All Microphone Cable Couplings Must be Arranged
- 3 Microphone Cables with a Woven Shield
- 4 Only Demodulated High Frequencies Appear as Interference
- 5 If It Is Not Sure Whether the Demodulation Happens
- 6 Only Amplitude Modulated RF Leads to Interference
- 7 Older Microphones of the Type U 87 tan
- Download this manual
Neumann-Information
183
August
1983
Some
informations
on
RF-interferences
in
the
Studio
Neumann
condenser
microphones
are
protected
through
various
means
very
effectively
against
RF
interferences
so
that
they
may
be
used
also
in
those
cases
where
other
microphones
due
to
heavy
RF radiation
do
not
perform
satisfactorily.
Some
of
our
past
years
experiences
pertaining
to
this
Problem
have
been
collected
here
for
the
purpose
of
helping
to
identify
this
type
of
interference
and
to
simplify
its
removal.
1.
RF frequencies
always
enter
through
the
microphone
cable
and
never
through
the
capsule
housing.
2.
All
microphone
cable
couplings
must
be
arranged
so
that
the
cable
shield
is
connected
to
the
connector
Shell
at
both
ends
of
the
cable.
It
is
not
sufficient
to
connect
theshield
only
through
the
relevant
plug
Pins.
The
shield
must
be
soldered
to
the
connector
Shell.
In
case
of
heavy
RF rad'iation
it
is
not
sufficient
to
only
clamp
the
shield
by
means
of
a screw.
All
connecting
cables
supplied
by
Neumann
comply
with
these
requirements.
Very
often
when
our
customers
prepare
their
own
cables
the
be-
fore
mentioned
interference
Problems
appear,
because
the
prerequisites
are
not
adhered
to
during
cable
assembly.
3.
Microphone
cables
with
a woven
shield
have
a remarkably
lower
degree
of
covering
an
area
than
such
cables
using
counterrotating
double
reusen
shielding.
For
this
reason
cables
with
reusen
shielding
are
remarkably
better
pro-
tecting
against
RF
interference.
Neumann
microphone
cables
are
using
this
counterrotating
double
reusen
shielding.
Cables
which
are
shielded
only
through
conduc-
tive
plastic
material
are
not
RF-proof.
4.
Only
demodulated
high
frequencies
appear
as
interference.
Semiconducter
circuits,
especially
the
gates
of
the
fieldeffect
transistors,
may
therefore
not
have
any
capacitive
coupling
to
RF
frequency
Signals.
5.
If
it
is
not
sure
whether
the
demodulation
happens
in
the
microphone
or
in
other
equipment
to
which
the
microphone
is
connected,
it
is
recommended
to
test
this
by
means
of
a 200
Ohms
equivalent
resistor
built
into
a plug
which
is
connected
instead
of
the
microphone,
or
with
a dynamic
microphone.
GN1
CHARLOTTENSTRASSE
3 . D-l000
BERLIN 61 . POSTFACH
610469
. TELEGRAMM:
NEUMANNACUSTIC
TELEFON:
(030) 25993-0
. TELEFAX:
(030) 25993-106
. TELEX: 164595
NEUAK D
Printed in Germany
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Table of Contents
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Summary of Contents for Neumann.Berlin Condenser Microphones
- Page 1 RF radiation past years experiences been collected here this type interference RF frequencies never through microphone cable shield both ends theshield only shield must heavy RF rad'iation shield supplied Neumann often when fore mentioned prerequisites...
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