Viking PA-250 Product Manual
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Viking PA-250 Product Manual

250 watt / 70v telecom paging amplifier
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Designed, Manufactured and Supported in the USA
VIKING
SECURITY & COMMUNICATION
Add High Power Paging, Loud Ringing, and
Background Music to Any Analog Phone System
The PA-250 is a 250 Watt 70V Telecom Paging Amplifier that
can drive up to two hundred fifty (250) 70V speakers and/or
paging horns (each speaker set to "1 Watt tap"). The small
1U rack size chassis is possible because the PA-250 uses
new amplifier technology that is 3 times more efficient than
old designs competitors use. The high efficiency of the
PA-250 means much less heat dissipation, smaller size,
higher reliability, and lower cost.
There are many advantages of using a 70V distributed audio
paging system, such as being able to put more speakers on
a wire run, having longer speaker wire runs, using smaller
gauge wire, and being able to set the volume of each speaker
independently.
The PA-250 connects to any type of analog telecom
interface, such as a Paging Port, Trunk Input, Analog Station,
FXO (Loop Start), or FXS (Ring Trip).
Features
• Powerful 70V amplifier drives up to 250 Watt load
• Page from any analog telecom port or a direct microphone
• Auxiliary and background music inputs
• Individual and master volume controls
• Bass and treble controls
• LEDs show audio level and activity
• Programmable input priorities
• Choose between 3 different chime sounds
• Provides Loud Ringing / Night Bell
• Night Transfer switch input
• 600 Ohm output to drive additional amplifiers
• Adjustable Automatic Level Control
• Peak limiter and multiple protection modes
• Tamper resistant trim pots
• Disconnects on silence, CPC, busy, return to dial tone or time-out
Information: 715-386-8861
www.VikingElectronics.com
PRODUCT
MANUAL
The PA-250 has a direct microphone input for paging, as well
as other inputs including Background Music, Aux Input, and
a variety of loud ringing and chime options. A 600 Ohm output
allows more paging amplification to be added if needed.
The PA-250 features individual level controls with LED
indicators for each input, automatic peak limiting, multiple
amplifier protection modes, an adjustable Automatic Level
Control, and Bass & Treble controls.
Touch tone programming allows users to set input priorities,
pre-page alert tones, different chime sounds, and numerous
telecom settings for universal telecom system compatibility.
The Aux Input allows the addition of another audio source
such as a clock-controlled tone generator (Viking model
CTG-1A or CTG-2A), or emergency notification system
(Viking model DNA-510).
• Paging systems requiring 8 to 250 speakers
• Paging from virtually any POTS, Centrex PABX, digital or IP phone
system's analog port
• Installations that can utilize the below advantages of a 70V distributed
audio system:
- Longer wire runs using smaller gauge speaker wire to save costs
- Many speakers can be connected on the same wire run to save costs
- Set each speaker's volume individually using its own power taps
Power: 100V to 240V AC, 50 to 60Hz
Dimensions: approx. 19" x 1.75" x 6" (483mm x 44.5mm x 153mm)
Shipping Weight: 5.2 lbs (2.3 kg)
Environmental: 0°C to 32°C (32°F to 90°F) with 5% to 95%
non-condensing humidity
Talk Battery: 42V DC
Paging Output: Capable of driving 250 Watt load of 70V speakers
Connections: (1) 3.5mm (1/8") audio jack, (22) removable cage clamp
screw terminals, (2) IEC C8 AC power inlets
Power Cord: Dual IEC C7 plugs "Y" power cord included
PA-250
250 Watt / 70V Telecom
Paging Amplifier
January 4, 2021
Applications
Specifications

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Summary of Contents for Viking PA-250

  • Page 1 Add High Power Paging, Loud Ringing, and Background Music to Any Analog Phone System The PA-250 is a 250 Watt 70V Telecom Paging Amplifier that The PA-250 has a direct microphone input for paging, as well can drive up to two hundred fifty (250) 70V speakers and/or as other inputs including Background Music, Aux Input, and a variety of loud ringing and chime options.

  • Page 2: Features Overview

    IMPORTANT: Electronic devices are susceptible to lightning and power station electrical surges from both the AC outlet and the telephone line. It is recommended that a surge protector be installed to protect against such surges. PA-250 Front View VIKING MODEL PA-250...

  • Page 3: Installation

    1#42 in programming). The VOX Silence Time Out feature will end the page after 3 seconds of silence, but is programmable from 1 - 9 seconds. S ee Programming section. Step 5 Adjust the front panel MIC trim pot so the MIC LED flashes with mic audio. PA-250 Back Panel Shure Model 522 Base-Station MICROPHONE...
  • Page 4 1. Connect earth ground to a shield terminal (3,7 or 11) to prevent noise during FXS pages. 2. Dialing ”#7” forces the PA-250 to hang up but the #7 touch tones will be heard over the speakers. 3. Paging Port Step 1 Move both back panel slide switches to the PAGING PORT position.

  • Page 5: Auxiliary Input

    D. 600 Ohm Output for Additional Paging Power When more than a 250 Watt load is required, a Viking model PP-250 can be added to achieve a 500 Watt load capability. Connect the PA-250’s 600 OHM OUTPUT terminals (pins 12 & 13), to the PP-250’s LINE INPUT Step 1 terminals (pins 1 &...

  • Page 6: Background Music Input

    The front panel RING trim pot can be used to adjust ringing and chime tone volumes. PA-250 Back Panel LOUD MICROPHONE RING FXO (LOOP START) FXS (RING TRIP) PAGE PORT PROG SPEAKERS Ringing Line, FXS or Optional Night Transfer Switch Disables loud ringing when PABX Station closed. Use Viking Model NS-1 (not included, DOD 540).
  • Page 7 Chime Trigger is factory set to the “Door Chime” (dingong) sound, but can be programed to the Step 2 “Electronic Warble” sound (see Programming section K). Step 3 The front panel RING trim pot can be used to adjust ringing, chime tones, and alert tone volumes. PA-250 Back Panel LOUD MICROPHONE RING FXO (LOOP START)
  • Page 8 250 Watts. For example, if there are 40 speakers, and all are wired to their 5 Watt taps, the amplifier is driving a 200 Watt load. Since the PA-250 is capable of driving a 250 Watt load, additional speakers could be added, Step 3 or some of the existing speakers could be tapped at a higher wattage setting to play louder.

  • Page 9: Accessing The Programming Mode

    A. Accessing the Programming Mode The PA-250 can be programmed directly from a touch tone phone or butt-set, or from a touch tone phone using a CO line, PABX analog station (FXS Port), PABX analog trunk input (FXO Port), or a Viking DLE-200B Line Simulator. Since phone system Paging Ports may not support touch tones, and also may not provide audio in both directions, programming the PA-250 from a Paging Port is not recommended.
  • Page 10 If a microphone that is connected to the MIC INPUT does not have a Push-to-Talk button, the Mic VOX Control feature should be enabled (enter 1#42 in programming). When enabled, the PA-250 will trigger microphone paging when mic audio is detected.

  • Page 11: Input Priority

    The PA-250 is factory set with the MIC input set to “1”, which is the highest priority, so it has the ability to interrupt both the PAGE and AUX audio inputs. The PAGE input is factory set to “2”, and the AUX input is factory set to “3”, the lowest priority.
  • Page 12 FXS (Ring Trip) paging requires some sort of signaling from the phone system that the distant phone has hung up. The PA-250 will hang up when it detects a CPC momentary open loop signal, (if the system provides it). If a CPC signal is not provided, but the system either returns to dial tone or a busy signal, the Return to Dial Tone Detection or Busy Detect feature should be enabled for the PA-250 to be able to drop the page.

  • Page 13: Operation

    A. Inputs In the idle state, the PA-250 allows Background Music to the speakers. When any of the three audio inputs are activated, background music is muted and the activated input is connected. Each input, except Background Music, has front panel LEDs that light up showing status of activity and audio level.

  • Page 14: Related Products

    70V paging systems such as Viking models PA-30, PA-60, PP-250, PA-250, 300AE PA-250-IP. The transformer has a range of power taps that are selectable with a 6 position rotary switch, so that installers are able to independently adjust the volume of each paging horn.
  • Page 15 PP-250 uses new amplifier technology that is 3 times more efficient than old designs competitors use. The high efficiency of the PP-250 means The PA-250-IP can drive up to two hundred fifty (250) 70V speakers and/or much less heat dissipation, smaller size, higher reliability, and lower cost.

  • Page 16: Returning Product For Repair

    Product Support: 715-386-8666 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.

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