D&R AIRMATE-USB Manual - page 12
7. TELCO-LINE MODULE 7-8 CONNECTORS, CONTROLS, & FUNCTIONS
Input modules 7 & 8 have integrated Hybrid circuitry with built in high quality Telephone Hybrids
as well as
stereo line inputs in case only one Hybrid is needed.
Highlights are:
* High quality Telephone Hybrid circuit to directly connect to phone lines
* Stereo line input
* Gain control
* Telco send Control
* Direct access CONNect and TB (Talk Back) switches
* Stereo Aux send
* Stereo CUE switch for pre fade listening
* Start (ON) switch
* 100mm smooth professional faders
WHAT IS A TELEPHONE HYBRID?
Telephone hybrids are hardware interfaces between professional audio equipment and public
telephone networks. They provide protection for your equipment and the public telephone lines,
allowing for various line signals and line conditions. Automatically canceling out the unwanted
signal, they facilitate two-way communication when using a single 2 wire telephone line.
Each Airmate-USB hybrid module has a Telephone line (WALL) connection and a handset con-
nection.
Thousands of D&R Telephone Hybrids (also built into this Airmate-USB) are used in radio and
television broadcasting facilities around the World allowing external callers to be connected to
the studio mixer for live broadcast. Many of the D&R Telephone Hybrids are supplied to radio
stations allowing extremely effective conversion between 4-wire audio circuits and standard 2
wire telephone lines.
Specs:
Output
: Internally connected in the Airmate.
Input
: Line level 0 dBu balanced, internally connected in the Airmate.
R/C balance
: fully adjustable.
Separation
: more than 30dB.
The controls of the Hybrid/Line modules have the following functions.
TELCO SEND
With this control you adjust the level of the outgoing signal to the telephone line.
TELEPHONE HYBRID / STEREO LINE INPUT SWITCH
When switched to the stereo line input, you have a high impedance line level input for connect-
ing cart machines, iPods, tape machines, or CD players.
The up position of this switch changes this module into a full blown telephone Hybrid module.
It is a Hybrid that can be connected to any standard telephone line.
R-BALANCE
Internal potentiometer (screwdriver control) to adjust for maximum side tone attenuation via
top panel hole.
C-BALANCE
16 position rotary switch to select the optimum side tone attenuation.
GAIN
With the GAIN control, the source level is adjusted to the internal mixer level.
This is for both the Telephone Line input and the Stereo Line inputs.
CONNect
This switch (when pushed) picks up the phone line when a call comes in.
Note: the incoming call will not be heard until the CUE is pressed or the ON switch and the
fader are activated which brings the signal to the mixer.