wheelock TBH-104 INSTALLATION INSTRUCTIONS

273 Branchport Avenue
Long Branch, N.J. 07740
[phone]

INSTALLATION INSTRUCTIONS

TALKBACK HORN SYSTEM

MODEL NUMBER: TBH-104

APPLICATION INFORMATION:

WARNING: ANY MATERIAL EXTRAPOLATED FROM THIS DOCUMENT OR FROM WHEELOCK MANUALS OR OTHER DOCUMENTS
DESCRIBING THE PRODUCT FOR USE IN PROMOTIONAL OR ADVERTISING CLAIMS, OR FOR ANY OTHER USE, INCLUDING DESCRIPTION
OF THE PRODUCT'S APPLICATION, OPERATION, INSTALLATION AND TESTING IS USED AT THE SOLE RISK OF THE USER AND WHEELOCK
WILL NOT HAVE ANY LIABILITY FOR SUCH USE.

The TBH-104 is a two component talkback system which consists of a control unit and an 8 ohm horn, both of which are designed for indoor or outdoor
use. An optional S-H8 8 ohm horn may be added to the TBH-104 system when 2 horns are required. The control unit contains an omni-directional
microphone and a preamplifier for talkback. It also contains a 4 watt amplifier to power the horn which is used for one-way voice paging, background
music and tone alerting. The TBH-104 is compatible with most EKSU, KSU (1A2) and PABX systems. The TBH-104 may be used in single zone or
multi-zone applications. For typical connection applications for the TBH-104, See Figure 2.

The 4 watt voice paging capability of the TBH-104 is ideal for use in noisy environments or for large areas. The talkback capability of the TBH-104 will
effectively service up to 1000 square feet, depending upon the background noise level. See Figure 1 and Chart 1 for relation between noise and
maximum reply distance. The direction of speech is controlled by the calling party (at the telephone), to prevent false switching of speech direction due
to background noise.

Machine Shop
Manufacturing (Noisy)
Printing Shop
Assembly Line
Supermarket
Transportation ­ Waiting Room
Office (Noisy)
Shipping/Warehouse

Location

dB

90
80
80
75
75

75
70
70

Figure 1: Talkback Distance Vs. Ambient Noise Chart 1: Typical Noise Levels

Figure 2: Talkback/Paging Connections & Applications Figure 2A: Optional S-H8 Second Horn Connection

CAUTION: These devices are not intended for use in hazardous locations as defined by the National Electrical Code (NEC) and by the National
Fire Protection Association (NFPA).

Copyright 1988, 1989, 1990, 1991, 1993, 1994 Wheelock, Inc. All rights reserved.

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NOTES:

1. Wheelock's TBH-104 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 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 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 is in the talkback mode.
B. When connected directly to an unused CO port:

- The LED will be illuminated when the TBH-104 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:

INSTALLATION INFORMATION:

The TBH-104 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 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 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, 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.

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.

* When 2 horns are used, they must be connected in series as shown in Figure 2A.

Figure 3: Control Unit Mounting Figure 4: Horn Mounting

CAUTION: Must be mounted as shown with keyhole tab at top.

CONNECTION DIRECTLY TO AN UNUSED CO PORT:

When connecting a TBH-104 directly to an unused CO port requiring talk battery to pass audio (most do), install with a Wheelock RPS-2406 power
supply as shown in Figure 4A.

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