seemix seeport 2 User Manual page 11

3. MODULES
Module Information
The TH3800 can be used in several different ways, either as a straight hybrid (without interacting with the
rest of the mixer) or as an integrated mixer channel with routing to and from the mix busses.
The incoming line signal can be routed, via the AB ON switch, to the A and B master busses. It can also be
sent to the PFL bus as well as to all AUX busses either pre or post fade. However, the channel can only be
sent to either AUX1 or AUX2, not both. This choice is jumper selectable. The reason for this is that AUX1 or
AUX2 can also be selected as the return signal to the caller (SEND) (also jumper selectable). These jumpers
must therefore be set differently for the two signal paths in order to avoid a feedback loop. Further, if two
hybrid modules are used simultaneously, by setting these jumpers in 'mirrored' positions for each module,
AUX1 and AUX2 can be used for cleanfeed mixes (N-1) for respectively line 1 and line 2.
The return signal (SEND) can be selected from AUX1/2 (as described above), PFL , A+B or an external
source. A+B would normally be selected when the line is to be used for transmission.
The module also has a channel out connector. This is fed from the post fade signal and provides an extra
output independent of the rest of the mixer. This enables the module to be used as a stand alone hybrid. For
example, the Channel Out is sent to an external mixer, and the output of this mixer is in turn connected to the
EXT input of the hybrid to provide the SEND signal to the caller. Any source connected to the EXT input can
be sent down the line for monitoring (SEND EXT). Similarly, any incoming telephone line signal can be moni-
tored directly from the channel output connector.
JUMPER SETTINGS.
The following jumper possibilities are available. Jumpers positions are indicated in the diagram below.
•
CUE1 or CUE2 signals can mute ringing from telephone set to avoid interruptions when on air
•
AUX POST dependent/independent of AB-switch
•
PFL muted by ON AIR, or PFL independent of ON AIR
•
STF (Norwegian standard), or 600 Ohm LINE IMPEDANCE
•
Line mixed to AUX1 or AUX2
•
AUX1 or AUX2 to SEND path (cleanfeed mix to caller)
Jumper settings
TH3800 MODULE AUDIO BLOCK DIAGRAM
Seeport 2 User Manual 11