Extron electronic PA 250 User Manual 2

User’s Guide

Operation

Specifications

Operation

2

1

3

Figure 4 — PA 250 front panel

Power LED — Lights when the PA 250 is on.

1

Level control — Adjusts the amount of compensation for

2

amplitude losses caused by cable resistance.

Peaking control — Adjusts frequency compensation. It is similar

3

to the sharpness control on a television. It
compensates for the effect of capacitance of
long cables. Use the symbol at the left as a
guide for adjusting the control.

Specifications

Video

Gain adjustment .......................... -4.9dB to 3.0dB

Peaking adjustment ..................... 30 MHz to 100 MHz, maximum +8dB

Bandwidth .................................... 250 MHz (-3dB)

Video input

Number/signal type ................... 1 analog RGBHV, RGBS, RGsB, RsGsBs

Connectors .................................... 5 BNC female

Nominal level(s) .......................... Analog ....... 0.7V p-p

Minimum/maximum level(s).... Analog ....... 0.4V to 2.0V p-p with no offset

Impedance .................................... 75 ohms

Horizontal frequency .................. 15 kHz to 150 kHz

Vertical frequency ....................... 40 Hz to 140 Hz

Return loss .................................... -37dB @ 5 MHz

Video output

Number/signal type ................... 1 analog RGBHV, RGBS, RGsB

Connectors .................................... 5 BNC female

Nominal level ............................... Analog ....... 0.4V to 2.0V p-p

Impedance .................................... 75 ohms

Return loss .................................... -20dB @ 5 MHz

4 PA 250 • Operation and Specifications

DC offset ....................................... ±10mV maximum

Sync

Input type ..................................... RGBHV, RGBS, RGsB, RsGsBs

Output type .................................. RGBHV, RGBS, RGsB

Input level ..................................... RGBHV, RGBS ......... TTL ............. 5V p-p

RGsB, RsGsBs ........... analog ......... 0.3V p-p

Output level .................................. TTL ............. 4V to 5V p-p

Input impedance .......................... 510 ohms

Output impedance ...................... 75 ohms

Max input voltage ....................... 5V p-p

Input sensitivity ........................... 0.6V to 5V p-p

Max. propagation delay.............. 130 nS

Max. rise/fall time ....................... 4 nS

Polarity .......................................... RGBHV, RGBS ......... positive or negative

(follows input)

RGsB, RsGsBs ........... negative

General

Power ............................................. 100VAC to 240VAC, 50/60 Hz, 10 watts,

internal, auto-switchable

Temperature/humidity .............. Storage -40° to +158°F (-40° to +70°C) / 10% to

90%, non-condensing

Operating +32° to +122°F (0° to +50°C) / 10% to

90%, non-condensing

Rack mount ................................... Yes, with optional rack shelf #60-190-01

Enclosure type .............................. Metal

Enclosure dimensions ................. 1.75" H x 8.75" W x 9.5" D

4.45 cm H x 22.23 cm W x 24.13 cm D

Shipping weight ........................... 5 lbs (2.3 kg)

Vibration ....................................... NSTA 1A in carton (National Safe Transit

Association)

Approvals ..................................... UL, CUL, CE

MTBF ............................................. 30,000 hours

Part number .................................. 60-179-01

Warranty ....................................... 2 years parts and labor

Part number

Part number .................................. 60-179-01

Specifications are subject to change without notice.

Extron Electronics, USA

1230 South Lewis Street, Anaheim, CA 92805

800.633.9876 714.491.1500 FAX [phone]
USA

© 2000 Extron Electronics. All rights reserved.

Extron Electronics, Europe

Beeldschermweg 6C, 3821 AH Amersfoort
+31.33.453.4040 FAX [phone]
The Netherlands

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+65.383.4400 FAX [phone]
Singapore 368363

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24-hour access—worldwide!

PA 250

Peaking Amplifier

68-202-02 A

Printed in the USA

01 01

Introduction

Installation

Installation, cont’d

The Extron PA 250 is a long-line peaking amplifier for driving RGB
video up to 1,000 feet. It can also be used as a sync stabilizer to
eliminate jitter. Other features include:

• RGB video bandwidth of 250 MHz

• Sync combining, boost, and sharpness capabilities

• Automatically strips incoming sync from the red, green, and blue
channels.

The quality of the image depends on the quality of all of the
components in your video system, including the cables.

Rear Panel Connectors and Controls

INPUT OUTPUT

R G B H/HV V R G B H/HV V

Figure 1 — PA 250 rear panel

Input BNC connectors — Attach to the input device.

1

DIP switches — The default for all switches is Off. If switches 1,

2

2, and 6 are Off, sync output depends on the impedance of the
output cables (75 ohm on RGB cables, up to 1 kohm on sync lines).

123456

1
2
3
4
5
6

2 41 3

100-240V 0.2A MAX

50/60 Hz

Flagging or bending at the top of the video image is a sign that
the serration pulses should be removed.

Off — Serration pulses pass through the PA 250.

5 — Pulse width

On — Vertical sync pulse width = 500 µseconds.

Off — Vertical sync pulse width = 150 µseconds.

6 — Digital display sync processing™ (DDSP™)

On — LCD (digital display) sync processing is on.

Off — Normal sync processing is active.

Output BNC connectors — Attach to the output device.

3

AC power input connector — Attach a standard IEC power cord

4

(100VAC to 240VAC, 50/60 Hz).

Installation Overview

Turn all of the equipment off. Ensure that the source device, the

1

PA 250, and the output device are turned off and disconnected
from the power source.

If desired, mount the PA 250 in a rack. See “Mounting the

2

PA 250” below.

Cable the inputs and outputs to the PA 250. See “Cabling” on

3

page 3.

Figure 2 — Rack mounting the PA 250

Cabling

Connect input and output cables to the PA 250 as shown below.

R

RGsB (sync on green)

The PA 250 can be attached to an input device, such as an interface
connected to a personal computer, and to an output device, such as a
large screen projector. The following figure shows a typical application.

PEAKING AMPLIFIER

4-40 X 1/8 Screws

Use 2 Mounting Holes

on Opposite Corners

G B

H/HV

V

PA

PA 250

250

P
E

A
K

I
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A

M
P
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I
F
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False F ront P anel

Uses 2 Front Holes Only

R

G B

H/HV

R

G B

H/HV

RGBS

V

RGBHV

V

Set the rear panel DIP switches. See (2) on page 1.

1 — SOG defeat

On — Sync on green (SOG) is not allowed. This setting

prevents the PA 250 from outputting an RGsB signal.

Off — Automatic sync detection is used (default setting).

2 — Force H&V

On — H and V sync are always separated. This setting

Mounting the PA 250

prevents the PA 250 from outputting an RGBS signal.

Off — Automatic sync detection is used (default setting).

3 — Force negative sync

On — Sync pulses are always negative.

Off — Sync output polarity follows input polarity.

4 — Serration pulse removal

On — Serration pulse are removed from the output vertical

sync pulse. LCDs, DLPs and plasma displays must
have the serration pulses removed to display properly.

1 PA 250 • Introduction PA 250 • Installation

4

Plug the input device, the PA 250, and the output device into a

5

grounded AC source.

Turn on the input and output devices.

6

If desired, mount the PA 250 to a rack shelf (Extron part number
60-190-01) as follows:

1. If feet were installed on the bottom of the PA 250, remove them.

2. Mount the PA 250 on the rack shelf, using two 4-40 x 1/8 screws

in opposite (diagonal) corners to secure the case to the shelf.

3. Attach the false front panel (provided with the rack shelf) to the
unoccupied side of the rack, or install a second half-rack device.

4. Attach the rack shelf to the rack using four 10-32 x 3/4” bolts
(provided). Insert the bolts through the #10 beveled washers,
then through the holes in the rack ears and rack.

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Up to 1000'

PA 250

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Interface

Rear

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SOG OUT

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Projector

PC Computer

Figure 3 — Typical PA 250 application

2PA 250 • Installation

3