Viking HF-3W Instructions for use

HF-3W
HF-3W
Handsfree Talkback
Amplifier
May 25, 2000
The HF-3W handsfree paging unit allows employ-
ees to respond to a paging message without reach-
ing for the telephone. It is perfect for use in city
desks, shipping and service applications where
quick answers are needed.
The HF-3W generates its own talk battery and will
interface with unused trunk ports on PABX’s and
key systems, and single line phones, as well as
some telephone systems with a two-way paging
port and a contact closure.
Allow Employees to Respond to Paging
Messages, Handsfree!
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• Improved audio circuitry
• Alert tone
• Selectable “Push-to-Talk” feature for noisy
environments
• 28V DC talk battery
• 3 watts of paging power
• Compatible with some two-way paging ports
• Background music input
• May be integrated into existing paging system
• (1) 25AE paging horn included
• 25-50 foot talk-back range
• Optional second speaker may be added
• City desks
• Shipping docks
• Manufacturing plants
• Service desks
• Warehouses
• Schools
• Parts departments
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: 28V DC
Speaker: (1) 25AE 8 ohm 5 watt horn included, (2) maximum
Maximum Speaker Run: 152 m (500 ft) maximum, 18 AWG
Amplifier: 3 watt output power
Connections: 10 pin screw terminal strip
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Simply page the intended employee with a question and they can respond by speaking toward
the paging horn.
Paging and talk-back volume sensitivity controls are provided.

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Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking Electronics, and its affiliates and/or
subsidiaries assume no responsibility for errors and omissions contained in this information. Revisions of this document or new editions of it may be issued to incorporate
such changes.
Fax Back Doc 470 ZF301430 Rev APrinted in the U.S.A.
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HANDSFREETALKBACK
PAGING SYSTEM
VIKING
ELECTRONICS
HUDSON,WI 54016
VIKING©
MODEL HF-3W
POWER 13.8VAC
PAGING INPUT
ALERTTONE
VOLUME
12345678910
TALK BATTERY
SHUNT
MUSIC INPUT
PAGE TRIGGER
PAGING HORN PUSHTO TALK
JP2
PAGING
VOLUME
TALK BACK
VOLUME
MIN MAX MIN MAX
-or-
Unused
PABX/KSU
Trunk Port
Single or Multi-
Line Phone
Existing Paging System
or
Background Music
Source Speaker Output
25AE Paging Horn
(included)
Optional Paging Port Installation
600 Ohm Two-Way
Paging Port with
Contact Closure.
Remove Talk
Battery Shunt (JP1).
Contact Closure
Two-Way Paging Port
JP1
JP2
Alert
Tone
Volume
1. Under normal background noise levels, set the Paging Volume control so that the page may be heard as
required. Then set the Talk Back Volume control in the middle (12 o’clock) position.
2. Test talk-back to be sure that the HF-3W will switch between paging and talk-back for your desired operating dis-
tance and noise level.
3. Adjust the Talk Back Volume control as necessary for your environment. The louder the background noise level,
the more you will have to decrease the Talk Back Volume and the shorter your talk-back distance will be.
When sitting idle, the HF-3W allows audio from a background music source or an existing paging system’s speaker output
to pass through to the paging horn.
Handsfree talk back paging is achieved by either accessing the two-way paging port, accessing the unused trunk port, or
coming off-hook on the single/multi-line phone. At this time, the background music is muted, a page alert tone is given and
paging with talk back is enabled.
Note: An optional second 25AE
Paging Horn may be added in parallel
to the existing horn to increase the
paging area.
If the Paging Input is to be connected to a paging port, the paging port must allow two-way talk path and provide a
contact closure during paging. Disable the Talk Battery by removing the Talk Battery Shunt (JP1) before connecting
to the paging port.
If the background noise is too loud for the HF-3W’s VOX circuit to operate properly, you will need to add a “push-to-
talk” button across screw terminals 9and 10, and remove shunt JP2. The “push-to-talk” button may be installed at
either the telco end or the speaker end. Use a normally open switch for the telco side or use a normally closed switch
for the speaker side.
A. Normal Background Noise Environment
B. Loud Background Noise Environment
C. Two-Way Paging Port Interface
If a page alert tone is not required, set the Alert Tone Volume to minimum (see diagram above).
D. Page Alert Tone
Note: For loud background noise, an
optional “Push-to-Talk” button may be
added, using a N/O or N/C switch or
the Viking SW-2 panel mount switch
(Fax Back Document 844).
Important: JP2 must be removed.