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Vintage mixer - Talkback feature

S

SFM-Ptgal

Not intended for any use, again just curiosity. The http://i215.photobucket.com/albums/cc118/SFM-PTGAL/Broadcast%20console/Semttulo.jpg?t=1323356962 has a TB ptt key. I have the manual that describes the "how to do" quite well. What's not clear to me is: where is the send feed connected so that on a remote location can ear studio orders? Is it related to the NETWORK input? Here's what the manual says:
http://i215.photobucket.com/albums/cc118/SFM-PTGAL/Broadcast%20console/network.jpg?t=1323359186
 
I remember those. When any remote switch is up, you can hear those remote feeds in CUE, and TALKBACK will allow you to talk back down those lines. Nobody ever really used that feature because the other end of the remote loop was usually a Shure mixer that wouldn't know what to do with a bidirectional loop. :)
 
My first job 30 years ago had a Stereo 80. Back in the days before good broadcast hybrids were cheap, the previous engineers had rigged one of the remote inputs to control telephone send/receive. There was a standard voice coupler connected to the telephone. With the remote switch in the down position, caller audio went on the air. When the switch set to the center, board audio would be fed down the phone and the caller audio input would be muted. It was crude and had its limitations (both announcer and caller couldn't be on the air at the same time and hear each other, and your right hand got REALLY tired) but it sounded good on the air.
 
It appears the send audio to the remote switches comes from the monitor amp circuit. I would guess whatever you had selected as a monitoring source (Program, Audition or External) would be the send feed.
 
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