Talkback Intercoms
These Products have been discontinuedPlease note that the casing for the TB-SD has been changed. All of the electronic features, functions and connections remain as for the previous version. However, we can not supply the old version any more.
Talkback - TB-SD Station Master Talkback Intercom, desktop free standing.
Talkback - TB-SD Desktop and TB-SR Rackmounted Systems
Talkback refers to the standard method of communication between broadcast studios.
Each studio has either a desktop, a rack-mount, or mixer-mounted intercom, usually containing a row of switch buttons. Eachswitch button connects to another studio when pressed, and routes the presenter audio to it.
There are 4 products in the Sonifex Talkback Intercom range:
- TB-6D 6 Way Talkback Intercom, desktop free standing
- TB-6R 6 Way Talkback Intercom, 19” rack mounted
- TB-SD Station Master Talkback Intercom, desktop free standing
- TB-SR Station Master Talkback Intercom, 19” rack mounted
Talkback - TB-SR Station Master Talkback Intercom, 19” rack mounted.
Radio Studio Application Using TB-SD & TB-SR
Using the Station Master as the core of a complete studio air-switching, distribution and talkback system, up to 4 studios can be connected using the TB-SD and TB-SR. A typical application would be to distribute talkback and audio feeds around a small radio station, as in this diagram.
The TB-SD and TB-SR intercoms are connected to the Station Master in a star pattern, with the Station Master as the central hub and unbalanced point-to-point links from it to each location. This setup could also be used for controlling on-air switching and for distribution of the external inputs to the other locations.
TB-SD & TB-SR Station Master Talkback Intercom Overview
These units are used for interfacing with the Sonifex Station Master studio switcher and are similar to the 6 way talkback intercoms, except that the talkback routing and switching (DC signalling) is handled by the Station Master.
Talkback For Up To 5 Locations
All of the features regarding level control, use of the microphone, speaker, headphones, volume control and external inputs are the same as for the TB-6D and TB-6R intercoms. However, the TB-SD and TB-SR can be used to communicate with up to 4 other locations (including the Station Master), or all of the locations by pressing the “ALL” button.
Whereas the TB-6D and TB-6R have talkback outputs and input on a 15-way male D-type plug, the TB-SD and TB-SR have instead a remotes socket consisting of a 25-way female D-type. This contains switch and indicator controls for the 4 talkback buttons together with power and talkback input/output/control lines to and from
the Station Master.
Features
- Provide talkback for up to 7 locations (TB-6D & TB-6R) or 5 locations (TB-SD & TB-SR).
- Brightly lit push-to-talk buttons.
- Momentary or latched buttons.
- Built-in electret microphone, with input for external microphone.
- Monitoring of 2 external inputs, e.g. for off-air receiver.
- Auto-muting, or mixing, of external inputs, when talkback is active.
- Integrates with Sonifex S2 mixer and is compatible with other talkback systems.
Talkback Intercom Systems Block Diagram
Technical Specification For Talkback |
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Audio & Power Specification |
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| Talkback Input/Outputs | 15 way male D-type plug (TB-6D & TB-6R) for 6 balanced talkback outputs and 1 balanced talkback input | |||||||
| Talkback Input Gain Range | 9dB to -28dB adjusted by rear panel preset pot | |||||||
| External Inputs & Mute | 9 way female D-type socket, for stereo balanced external input 1, stereo unbalanced external input 2 (or external talkback input/output), talkback control output and mute input | |||||||
| External Input 2 | Dual phono socket, stereo unbalanced in parallel with the 9 way female D-type socket |
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| External Inputs Impedance | > 30kΩ unbalanced > 40kΩ balanced |
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| External Talkback Input Impedance | > 30kΩ unbalanced | |||||||
| External Talkback Output Impedance | < 80Ω unbalanced | |||||||
| External Microphone Input | 3 pin female XLR socket | |||||||
| Mic Input Impedance | 1.5kΩ balanced | |||||||
| Microphone Input Gain Range | 74dB to 53dB adjusted by rear panel preset pot | |||||||
| Headphone Output | 6.35mm (1/4”) jack, unbalanced stereo capable of driving 150mW into 32-600Ω headphones |
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| Headphone Output Gain Range | 9dB to <-60dB (off) adjusted by front panel pot | |||||||
| Station Master Remotes | 25 way female D-type socket (TB-SD & TB-SR) | |||||||
| Loudspeaker Power | 1W | |||||||
| Mains Input Power | 85V - 264V AC, 47-63Hz, max 10W | |||||||
| Fuse Holder | 1A anti-surge fuse | |||||||
Physical Specification |
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| Order Code | Description | Height |
Width |
Depth |
Total Nett Weight |
Total Gross Weight |
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| TB-6D | 6 Way Talkback intercom, desk units | 6 cm (front) 2.4” (front) 8.6 cm (rear) 3.4” (rear) |
22.4 cm 8.8” |
22.5 cm 8.9” |
1.25kg 2.75lb |
2.0kg 4.4lb |
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| TB-SD | Station Master Talkback intercom, desk units | 6 cm (front) 2.4” (front) 8.6 cm (rear) 3.4” (rear) |
22.4 cm 8.8” |
22.5 cm 8.9” |
1.25kg 2.75lb |
2.0kg 4.4lb |
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| TB-6R | 6 Way Talkback intercom, 19” rack mounted | 8.9cm 3.5” |
48.3cm 19” |
18.5cm 7.3” |
2.60kg 5.7lb |
4.0kg 8.8lb |
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| TB-SR | Station Master Talkback 19” rack mounted |
(2U) |
(19” rack) (48cm rack) |
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