Viking HF-2WC Technical Practice

Telecommunication Peripheral Products

Technical Practice

HF-2WC

Handsfree Talkback

Amplifier

September 17, 1998

Allow Employees to Respond to

Paging Messages, Handsfree!

The HF-2WC handsfree paging unit allows
employees to respond to a paging message
without reaching for the telephone. It is
perfect for use in city desks, shipping and
service applications where quick answers are
needed.

The HF-2WC generates its own talk battery
and will interface with unused trunk ports on
PABX’s and key systems or with single line
phones.

Simply page the intended employee with a question and they can respond by
talking toward the paging horn.

Paging and microphone volume sensitivity controls are provided.

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http://www.VikingElectronics.com

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Features Applications

• Two-way paging speaker included

• 25-50 foot operating range

• Paging volume control

• Talk back volume control

• Optional second speaker may be added

Sales...(715) 386 - 8861

Made in the U.S.A.

• City desks

• Shipping docks

• Production floors

• Service desks

• Warehouses

Specifications

Power: 120V AC/13.8V AC 1.25A, UL listed adapter provided
Dimensions: 133mm x 89mm x 44mm (5.25” x 3.5” x 1.75”)
Shipping Weight: 1.36 kg (3 lbs.)
Environmental: 0°C to 32°C (32°F to 90°F) with 5% to 95% non-

condensing humidity

Talk Battery: 12V DC
Speaker: (1) 25AE 8 ohm 5 watt horn included, (2) maximum
Connections: RJ11 and screw terminal strip
Maximum Speaker Run: 91 m (300 ft) maximum, 18 AWG
Amplifier: 2 watt output power

Installation

k

Note: Turn the Paging
Volume Control counter

clockwise (+) to increase paging
volume, clockwise (-) to
decrease paging volume.

120V AC

Unused PABX/KSU

Paging Volume Control

Talk-Back Volume Control

+-+-

HANDS-FREE TALK-BACK

PAGING SYSTEM

VIKING

ELECTRONICS

HUDSON, WI 54016

Trunk Port

PAGING

VIKING©

MODEL HF-2WC

POWER - 13.5V AC 1 2 3 4 5

UNUSED

TRUNK

INPUT

or

TALK BACK

25AE Paging Horn

Single

Line Phone

Note: Turn the Talk-Bac
Volume Control counter

clockwise (+) to increase
microphone sensitivity,
clockwise (-) to decrease
microphone sensitivity.

Programming

Under a normal background noise environment, set the Paging Volume Control so that the page may be heard as
required. Then set the Talk-Back Volume Control in the middle between the “+” and “-” position. Test talk-back to be
sure that the HF-2WC will switch between paging and talk-back for your desired operating range and noise level. Adjust
the Talk-Back Volume Control as necessary for your environment. The louder the ambient noise level, the more you
will have to decrease the microphone sensitivity and the smaller your talk-back range will be.

If the background noise is too loud for the HF-2WC to operate properly, you may have to add a “Push to Talk” button as
shown in the diagram below.

HF-2WC Circuit Board Layout

Cut this end of CR8

Whenever the button is pressed,
the talk-back will be activated.
Whenever the button is released,
the HF-2WC will function only as
a one-way paging unit.

R9

CR8

100Ω 1/4W

Resistor

Normally

Closed
Button

Product Support Line...[phone] Fax Back Line...[phone]

Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking
Electronics, its affiliates and/or subsidiaries assume no responsibility for errors and/or omissions contained in this information. Revisions of
this document or new editions of it may be issued to incorporate such changes.

Printed in the U.S.A. ZF280370 Rev DFax Back Doc # 480