User manual

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 al-
lowing 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 temporarily connect the line (wall) connector to the Phone connector (appliance)
to be able to dial and make a connecon.
ON-LINE CONNECT : Line connect switch to connect and disconnect calls from the telephone line.
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 Mix Minus/Clean feed (N-1)output of the mixer.
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