eela audio
EA815/2
Telephone hybrid
User guide
EA Broadcast / eela audio
http://www.eela-audio.com
Eela Audio EA815/2 Telephone hybrid
WARNING
Do not expose this appliance to rain or moisture. To reduce the risk of electrical shock, do not remove
cover. There are no user-serviceable parts inside. Do not attempt to repair the unit yourself, refer
servicing to qualified personnel.
CE-Product
This product is in conformity with the requirements of the CE directives.
This product should only be installed and used in installations as specified in this manual and should
only be used with the ancillary equipment and options and in the right environment according the
recommendations.
The supplier will not take any responsibility of damage to or induced by this product caused by using
the equipment in any not specified application or connecting items or equipment, in any way or
environment other than specified.
General Information
Cleaning
Clean the outside of this product with a soft cloth. Do not use any cleaning detergents like alcohol,
white spirit or ammonia based fluids to clean this product. This can severely damage the finish of the
product.
Eela Audio EA815/2 Telephone hybrid
SYSTEM DESCRIPTION
The design goal for EA815/2was to produce a telephone hybrid with the best results and the
easiest operation. There is only ONE operator control; the ON switch to connect the PTT-line to
the hybrid instead of a telephone. The function can be remote controlled.
The power supply is a wide range “universal” adapter suitable for 100 to 240 Volts, 50/60 Hz and
comes with Euro, UK and US/Japan style wall plugs. Please note that these power supplies will
not work with older hybrids nor will the previous transformer adapters work with the new units.
The hybrid itself is composed around two transformers with a PRESET BALANCE NETWORK.
This preset network needs to be trimmed only at installation for best balance on an average line.
Practice has shown, that the connection to the first exchange is determining for the setting and in
most cases this is always the same line.
The best results can be obtained when a DIRECT telephone line is used, not routed via a house
telephone system.
To achieve the best damping of the send signal in the receive signal, this hybrid employs VOICE
CONTROL in combination with the preset balance.
The following processing is done:
The SEND signal is bandfiltered and limited, so not to spoil the damping by too much level and out
of band signals.
The RECEIVE signal has:
* VOICE CONTROL of the gain by the SEND signal. As soon as the studio starts talking,
the gain of the receive chain is reduced to lower the crosstalk over the hybrid. By this
action, the direct signal of the microphone is not spoiled by the crosstalk from the hybrid
and so gives a cleaner result.
* Also some filtering is employed to reduce out of band signals like hum, dailing pulses etc.
GAINS for SEND and RECEIVE are adjustable through the frontpanel.
Eela Audio EA815/2 Telephone hybrid
CONNECTIONS
The SEND and RECEIVE signals are on XLR connectors. The PTT-connection and the
TELEPHONE-connection are on universal telephone connectors. The REMOTE connections are
on a D-9 connector. On this D-9 connector are also the SEND and RECEIVE signals and an
optocoupler-RING output available. The pinning of these
connectors are drawn elsewhere in
this manual.
INITIAL SETUP
* Connect the unit to the mains, a mixing console, a telephone and a PTT connection.
* Leave the HYBRID ON switch (green button) off and make a connection with a remote
caller. It is the best to use a distant connection; a local or house-line can give other
results. If possible, have the caller on the other end his mouth piece covered or simply
keep him/her quiet.
* Then press the HYBRID ON switch. After a short delay of 0.7 seconds the EA815 is
switched on.
* Send programm, preferably speech at nominal level, to the line and use the console PFL
system to listen to the hybrid output. Adjust the SEND level on the EA815/2 in such a way
that the limiter LED on the front of the EA815/2 only lights up at peaks in your send
signal.
* Then adjust both balance controls (R- and C-balance), behind the frontpanel, for
minimum bleed through from the send signal to the output. Use first the center position of
both controls and adjust them several times untill a clear minimum is reached. Try
eventually several connections to get the best compromise. Only in case the PTT has
done changes on the exchange or line a new line-up is needed.
* Adjust the RECEIVE gain until the required level is reached.
USING PROCEDURE:
* When an outgoing call is made, the EA815/2is still switched off. The connection has to be
made with the connected telephone. Once the connection is made the EA815/2can be
switched on. The phone is now disconnected.
* In case of an incoming call the phone will ring normally, and the call LED on the
EA815/2lights up. You can either pick up the phone or switch the EA815/2on. When the
unit is switched on, the phone is disconnected again.
ACCESSORIES:
Also available are a 19" rack mounting kit for one unit (an empty housing and 19" brackets are
supplied under code EA800/3) and a rackmounting kit for mounting with another unit from the
EA815 / EA816 series equipment (19" brackets under code EA800/4).
Eela Audio EA815/2 Telephone hybrid
EA815/2DIAGRAMS
Please note: Remote connector has changed in SMD versions!
Power supply units of older versions do not match!
EA Broadcast / Eela Audio
Het Riet 8 A
5431NM Cuijk
The Netherlands
http://www.eela-audio.com
Eela Audio EA815/2 Telephone hybrid
Optional rackmounts:
EA800/3, 19" 1HE rack mount kit for 1 unit (130 mm)
EA800/4, 19" 1HE rack mount kit for 2 units (20 mm)
Eela Audio EA815/2 Telephone hybrid
Eela Audio EA815/2 Telephone hybrid
EA Broadcast / eela audio
http://www.eela-audio.com
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