wheelock TBH-104-LH INSTALLATION INSTRUCTIONS

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Long Branch, N.J. 07740 Thank you for using our products.
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INSTALLATION INSTRUCTIONS

Use this product according to this instruction manual. Please keep this instruction manual for future reference.

MODEL NUMBER: TBH-104-LH

APPLICATION INFORMATION:

TALKBACK HORN SYSTEM

NOT SUPPLIED WITH HORN

The TBH-104-LH 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-LH 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-LH is
compatible with most EKSU, KSU (1A2) and PABX systems. The TBH-104-LH may be used in single zone or multi-zone
applications. For typical connection applications for the TBH-104-LH, See Figure 2.

The 4 watt voice paging capability of the TBH-104-LH is ideal for use in noisy environments or for large areas. The talkback
capability of the TBH-104-LH will effectively service up to 1000 square feet, depending upon the background noise level. See Figure
1 and Table 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.

NOTE: All CAUTIONS and WARNINGS are identified by the symbol

. All warnings are printed in bold capital letters

Location

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

dB

90
80
80
75
75

75
70
70

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

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

Copyright 1997 Wheelock, Inc. All rights reserved.

NOTES:

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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 two­way 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 key­hole 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.

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