D&R HYBRID-1 User Manual - What Is A Telephone Hybrid?
What is a Telephone hybrid?
Telephone hybrids provide the interface between professional audio equipment and the public telephone network.
They provide protection for your equipment and the public telephone lines, allowing for varying line signals and line
conditions. Automatically canceling out the unwanted signal they also facilitate two-way communication down a
single telephone line.
Each hybrid has a telephone line connection, a handset connection and separate connectors for audio input and
output from a broadcast mixer, or other professional audio source.
A large proportion of D&R hybrids are used in radio and television broadcasting applications allowing external callers
to be connected to the studio mixing console. Most of the other units are supplied to communication operations al-
lowing extremely effective 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
Separation: more than 30db.
Front panel lay-out
C-BALANCE
: 12 pole rotary switch to select the optimum side tone attenuation.
R-BALANCE
: Internal potentiometer to adjust for optimum side tone attenuation.
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 interrupting the phone line connection)
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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