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A momentary talkback button (which also has a permanent on (Lazy) switch), switches the 3rd input of the mixer to the talkback line Codec, this talkback also appears on a rear panel ˜bantam” jack. An indicating LED shows when talkback is in use.
Monitoring is provided from 4 sources, each with its own level control and each can be switched to both (left & right) or either (left or right) channels of the headphone amplifier. These 4 sources are: TALKBACK from the 2nd Codec or from a rear panel input on ˜bantam” jack: CUE the return feed of the program line Codec: EXT a local external input on rear panel ˜bantam” jack: MIX the output of the mixer. The headphone amp output is on three front panel A/B gauge headphone jack sockets, one wired to only the left channel of the headphone amp, one wired only to the right channel & one wired to both. The headphone amplifier is for headphone impedances of 200 to 2000 Ohms.
A record output (on a rear panel ˜bantam” jack) is a mix of the output of the GSGC25’s mixer and the return programme cue line.
For ISDN line dialling, answering and Codec set up functions a front panel keypad is provided. A 3 position toggle switch, switches this keypad to control either the programme line, the talkback line or a safe function that prevents the keypad from being used accidentally. Each of the 2 G722/ G711 Codecs has a large green LED to show when Codec lock is O.K. and also a large red LED to show when an ISDN line is open.
The GSGC25 can be powered from 2 ˜D” cells (approximate battery life of 4 hours) or an external plug top PSU. If it is being powered from the external supply and the supply fails the batteries will automatically take over. A front panel LED shows when the GSGC25 is switched on and flashes to indicate when battery level is low.
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