2830A UM
8.2
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8.1.2 4-
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in
sy
A
WHAT IS
It is a 4-W
microphone
systems. It
telephone.
8.2.1
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-Wire Mode
-Wire mode u
nd a downlink
n both directi
ystem is the
Amron's Full D
S FULL DUP
Wire dual com
e and earpho
allows everyo
WHY ARE SP
When develop
esigner is os
ommon is aco
microphone pi
his signal is
onditions, this
he result is u
ystems when
he solution fo
he speaker fro
coustic isolat
eedback via t
he tender and
alk Module a
he SPEAKER
here exists a
scillation. In
ignal from the
xtremely low
arries the ou
arphone. This
bout 1000 tim
mes greater.
microphone w
scillation. To
ndividual twis
ommunication
Shielding does
pecial amplifie
uses two com
k from the ten
ions at the s
telephone. A
Duplex (4-Wire
PLEX (4-WIR
mmunication
one connectio
one on the co
ECIAL AMPL
ping a 4-Wire
scillation caus
oustic feedba
cks up the so
amplified and
s process re
usually a high
the volume is
or acoustic fee
om the micro
tor. On the su
the PANEL S
d the PANEL S
ccessory. Alt
R SWITCH loc
a second, mo
4-Wire mode
e diver micro
level signal,
utput signal
s signal can
mes greater th
. If the sign
wire pair, the
prevent suc
sted wire pai
n cable, each
s decrease th
ers, the full ca
32
mmunication p
nder to the di
same time. A
Another exam
e) is not the s
RE)?
path system
on to eliminat
ommunicator
LIFIERS NEE
e communicat
sed by feedba
ack, also calle
ound from the
d sent out th
peats until th
h pitch, howlin
s turned up to
edback is to t
ophone. In a d
urface, a tend
SPEAKER. Th
SPEAKER by
ernatively, the
cated on the f
ore difficult to
e, there are t
phone to the
, typically in
from the co
be as high a
han the micro
al on the e
e result wou
ch coupling,
irs and in h
h pair can b
he amount of
apability of us
M
paths: an upl
ver. This allo
An example
mple is called
same as Roun
that uses s
te the issues
to talk to eac
DED?
tion system,
ack. This can
ed the Larsen
e speaker and
e speaker at
he amplifier r
ng sound com
oo high.
turn down the
dive helmet,
der using a h
he solution is
y using the Am
e PANEL SP
front panel.
o avoid feedb
two sets of w
communicat
the range of
mmunicator
as 4VRMS. T
ophone signa
arphone wire
uld be a fee
the dive cab
igh quality c
e shielded to
coupling betw
sing twisted w
MODEL 2830
ink from the
ows voice com
of this type
Round Robin
nd Robin.
special audio
s associated
ch other just a
the biggest p
n occur in tw
n effect, whic
d feeds it back
t a higher lev
reaches max
mmonly heard
e amplifier vol
the diver's he
headset may
to put some
mron Model 2
PEAKER can
back path th
wire pairs. On
or microphon
f about 1mV
power ampli
The earphone
al and can be
e pair were
edback path
bles are cons
cables, such
o provide ad
ween the wir
wire pairs is lo
0A USER MAN
REV
diver to the t
mmunications
of communic
n communica
amplifiers o
with Round
as if they were
problem facin
wo ways. The
ch occurs whe
k into the amp
vel. Given the
ximum signal
d in public ad
lume and to is
ead makes a
get some aco
e distance bet
2822-28 Walk
be turned off
at can also c
ne pair carrie
ne input. This
RMS. The se
ifier to the d
e signal is typ
e as much as
to couple t
that can le
structed usin
as Amron's
ditional prote
re pairs but w
ost.
NUAL
3.0
tender
to go
cation
ations.
on the
Robin
e on a
ng the
most
en the
plifier.
e right
level.
ddress
solate
good
oustic
tween
k-and-
using
cause
es the
s is an
econd
diver's
pically
4000
to the
ad to
g two
CC1
ection.
without
Summary of Contents for 2830A/24 Series
Page 17: ...2830A UM 4 7 M DRAWIN NG 2 WIRE CONNECT 14 IONS M MODEL 2830 0A USER MAN REV NUAL 3 0...
Page 40: ...2830A UM 9 1 M SCHEMA ATIC 2830A A 24 37 M MODEL 2830 0A USER MAN REV NUAL 3 0...
Page 41: ...2830A UM 9 2 M SCHEMA ATIC 2830A A 24 MS 38 M MODEL 2830 0A USER MAN REV NUAL 3 0...
Page 42: ...2830A UM 9 3 M SCHEMA ATIC OPTIO ON 2826 HS 39 SU M MODEL 2830 0A USER MAN REV NUAL 3 0...
Page 43: ...2830A UM 9 4 M SCHEMA ATIC OPTIO ON 2828 10 40 0A M MODEL 2830 0A USER MAN REV NUAL 3 0...
