D&R HYBRID-1 User Manual

TELEPHONE

HYBRID-1

USER

MANUAL

V.1.06

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Dear Customer,

Thank you for choosing the Telephone Hybrid-1.

This me you are not faced with a huge manual because it is simply not necessary because of the natural recogni­on of all funcons on the user interface.
All funcons are self-explanatory and you will certainly appreciate the ergonomics of this design.

We are condent that you will be using the Telephone Hybrid-1 for many years to come, and wish you a lot of suc-

cess.

With kind regards,

Duco de Rijk
md

D&R ELECTRONICA B.V.
Rijnkade 15B
1382 GS WEESP-HOLLAND
The Netherlands
Phone: [phone]

Fax: [phone]
Website: hp://www.d-r.nl

E-mail: [e-mail]

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What is a Telephone hybrid?

Telephone hybrids provide the interface between professional audio equipment and the public telephone network.
They provide protecon for your equipment and the public telephone lines, allowing for varying line signals and line
condions. Automacally canceling out the unwanted signal they also facilitate two-way communicaon down a

single telephone line.

Each hybrid has a telephone line connecon, a handset connecon and separate connectors for audio input and
output from a broadcast mixer, or other professional audio source.
A large proporon of D&R hybrids are used in radio and television broadcasng applicaons allowing external callers
to be connected to the studio mixing console. Most of the other units are supplied to communicaon operaons al­lowing extremely eecve conversion between 4-wire audio circuits and standard telephone lines.

Specs:

Output: balanced mic level - 30db.
Input: Line level 0 dBu balanced.

R/C balance: fully adjustable
Separaon: more than 30db.

Front panel lay-out

C-BALANCE : 12 pole rotary switch to select the opmum side tone aenuaon.
R-BALANCE : Internal potenometer to adjust for opmum side tone aenuaon.
TO CALLER : Switch to connect the audio in (connected to cleanfeed output jack on the back of the unit)

to the caller.

CONNECT : Connect calls to the mixer and disconnect calls from the telephone line.
(without interrupng the phone line connecon)

Back panel lay-out

PHONE : RJ-11 connector to connect with a handset.
LINE (wall) : RJ-11 connector to connect with the public telephone network.
TO MIC INPUT : Stereo jack output to be connected to Mic input of the mixer.
TO CLEANFEED OUTPUT : Stereo jack input to be connected to a Mix Minus/Clean feed (N-1)output of the

mixer.

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USER MANUAL

The D&R Telephone Hybrid-1 is designed to create an easy connecon between the public telephone line and your
studio equipment.
The Hybrid has to be inserted between your telephone and the telephone line. Connect the two wires of the tel­ephone line’s wall unit to the RJ-11 connector labelled LINE (wall) and connect the telephone appliance itself to the
Hybrid’s phone output on the RJ-11 connector labelled PHONE. This can be done with standard available cable as-

semblies from your local phone shop.

Now the Hybrid is interfaced (fully balanced) between your telephone appliance and its connecon to the outside
world. The hybrid can now split the send and return signals.

Now connect the hybrid’s balanced audio input labelled TO CLEANFEED OUTPUT to a (preferable) balanced output
of around +4dBu. This output has to be the mix of all signals except the signal coming from the hybrid itself to avoid

feedback.

An Aux. output on your mixer will do as well as long as you keep the Aux. send of the channel you return the phone
signal on closed (all other Aux. sends need to be open), or in broadcast mixers a clean-feed is the best.

The Hybrid-1 stereo jack connector labelled TO MIC INPUT has to be connected to a Mic level input of your mixing

console.

NOTE: The output of the Hybrid has to be connected to a Mic input of the mixing console, because the outgoing
level is very low because of the passive circuitry inside the Hybrid.

WIRING SCHEME

PHONE : RJ-11 connector to connect with a handset.
LINE (wall) : RJ-11 connector to connect with the public telephone network.
TO MIC INPUT : Stereo jack output to be connected to mic input of the mixer.
TO CLEANFEED OUTPUT : Stereo jack input to be connected to Mix Minus/Clean feed (N-1)output of the mixer.

______________________________________________________________________________________________

WIRING OF BOTH PHONE AND LINE RJ-11 CONNECTORS

PHONE/WALL RJ-11 FUNCTION CONNECTION

Pin 1: n.c.

Pin 2 A (telephone line) In/out
Pin 3 B (telephone line) In/out

Pin 4 n.c.
______________________________________________________________________________________________

WIRING OF AUDIO IN AND OUTPUTS

STEREO JACK TO MIC INPUT FUNCTION CONNECTION

Screen Screen (ground) Audio ground
Tip Phase (hot) Audio +
Ring Non-phase (cold) Audio -

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STEREO JACK TO Clean feed output FUNCTION CONNECTION

Screen Screen (ground) Audio ground
Tip Phase (hot) Audio +
Ring Non-phase (cold) Audio -

______________________________________________________________________________________________

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