P83676 A
Sheet 2 of 5
1. Wheelock's TBH-104-LH Talkback Horn may be connected to a 600 ohm low power audio page port, if the page port allows two-
way audio. Check with telephone system manufacturer.
2. If unused CO port requires talk battery to pass audio (most do), then install using a Wheelock RPS-2406 power supply as shown
in Figure 4A. For multi-zone applications, a Wheelock Zone Control is required as an interface.
3. "INH" is used only when TBH-104-LH is connected to a Wheelock Zone Control. The "INH" wire inhibits (disconnects) talkback
when an all zone page is initiated. Use adjacent "GND" wire only when TBH-104-LH and Zone Control are using separate power
supplies. When not connected to a Zone Control, install a jumper between adjacent "GND" and "INH" terminals.
PRIVACY LED INDICATOR OPERATION:
A. When connected to a Wheelock Zone control Module:
- The privacy LED illuminates only when the TBH-104-LH is in the talkback mode.
B. When connected directly to an unused CO port:
- The LED will be illuminated when the TBH-104-LH is in the idle state. Occasional flicker of the LED is normal (caused by
sudden noise).
- When in the two-way communication (hands free talkback) mode, the privacy LED will be illuminated only when in the
talkback mode.
SPECIFICATIONS:
Parameter Min.
Nom.
Max.
Units
Supply Voltage
-20
-24
-28
VDC
Operating Current
---
250
400
mA
Audio Input Level
-15
---
10
dBm
T & R Input Impedance
---
600
---
Ohms
Switching Speed
---
200
---
m Sec
Audio Output Level @ 1 Meter One 8 ohm horn ---
115
---
dB
Two
8
ohm
horns
*
--- 110
(Each) ---
dB
Output
Power One
8
ohm
horn ---
4
---
Watts
Two
8
ohm
horns
*
--- 1.5
(each) --- Watts
Talkback Reply Distance @ 50dB Ambient
---
50
---
Ft.
Table 2.
* When 2 horns are used, they must be connected in series as shown in Figure 2A.
INSTALLATION INFORMATION:
The TBH-104-LH has been designed as a two component system to allow each component to be located so the optimum effectiveness
of each can be obtained. The system should not be located near noise producing equipment such as machinery, fans, air conditioners,
etc. The TBH-104-LH Horn should be positioned in a location that will project the paging output toward the area to be covered. The
horn should be mounted at least 15 feet above floor level. The TBH-104-LH Control Unit should be located in an area with the least
amount of ambient noise and the most convenient place for people to reply to the page. Refer to Figure 1 and Chart 1 for suggested
reply distances at a given ambient noise level. Ideal mounting height for the control unit is 6 to 12 feet above floor level.
When installing the TBH-104-LH, be sure to use mounting hardware suitable for the surface to which the components are to be
mounted. To install the Control Unit, simply mount one screw in desired location for top (key hole) tab of control unit. Place key-
hole tab over the screw. Secure the control unit by mounting a second screw through the clearance hole of the bottom tab, spacing the
2 mounting screws vertically on 10.250" centers (See Figure 3). The horn may be surface mounted by simply using the holes in the
swivel base to locate and drill mounting holes. The mounting base is also fully adjustable in both the vertical and horizontal planes.
To rotate horn into desired position; first loosen wing nuts located on the base of horn, position horn as desired, then re tighten wing
nuts to maintain selected position. See Figure 4.
