Controls
Output Volume
Controls the volume at the loudspeaker. Clockwise rotation of the control increases the level; counterclockwise rotation decreases
the level.
Talkback Volume
Adjusts the talk back volume level in the handset earpiece. Clockwise rotation increases the level; counter clockwise rotation
decreases the level.
Switching Sensitivity
Adjusts the point at which the VOX circuit will switch from talk back to talk modes. Clockwise rotation increases sensitivity;
counter clockwise rotation decreases sensitivity.
Switching Delay
Adjusts the release time of the VOX circuit, allowing for short pauses between words without causing the unit to switch to the
talkback mode in the middle of a sentence. Clockwise rotation increases the delay; counterclockwise rotation decreases delay.
Configurations
Remote Privacy:
Any remote speaker may be modified for privacy (see Figure 2). When SW1 is open, paging announcements
from the telephone handset are received at the loudspeaker, but the telephone operator cannot monitor the loudspeaker area.
Single Zone Talk Back with TAMB2:
A single paging zone, at the trunk or station level, is configured using the Bogen Model
TAMB2, Telephone Access Module. Note that a power supply is required for both the trunk and station access modes (see Figure 3).
Multi-Zone Station Level Paging:
The use of a Bogen ZPM3 Zone Paging Module permits up to 3 zones of paging. Both
one-way and two-way zones may be incorporated in the configuration. Installation instructions are included with the ZPM3.
TALKBK
VOL
SWITCH
SENS
SWITCH
DELAY
MIN MAX
MIN MAX
MIN MAX
TEL
LINE
MUTE
GND COM 25V 70V
+
TO TBA15
CR1
CR2
SW1
25V OR 70V
A74-2665-01
Figure 1 – TBA15 Terminal Strip
Figure 2 – Remote Privacy
2
NOTES:
CR1 AND CR2 ARE 50 prv, 1A
(IN4001 OR EQUIVALENT).
SW1 IS AN SPST SWITCH.
