Extron electronic PA 250 Introduction, Rear Panel Connectors and Controls, Installation, Cabling

Introduction

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

100-240V 0.2A MAX

		INPUT					OUTPUT
				1	1
				2	2
				3	3
				4	4
				5	5
				6	6
R	G	B	H/HV	V	R	G	B	H/HV	V	50/60 Hz

1 2 3 4

Figure 1 — PA 250 rear panel

1Input BNC connectors — Attach to the input device.

2DIP switches — The default for all switches is Off. If switches 1, 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).

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 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.

Installation

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.

3Output BNC connectors — Attach to the output device.

4AC power input connector — Attach a standard IEC power cord (100VAC to 240VAC, 50/60 Hz).

Installation Overview

1Turn all of the equipment off. Ensure that the source device, the PA 250, and the output device are turned off and disconnected from the power source.

2If desired, mount the PA 250 in a rack. See “Mounting the PA 250” below.

3Cable the inputs and outputs to the PA 250. See “Cabling” on page 3.

4Set the rear panel DIP switches. See (2) on page 1.

5Plug the input device, the PA 250, and the output device into a grounded AC source.

6Turn on the input and output devices.

Mounting the PA 250

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.

Installation, cont’d

PA 250	PA 250
PEAKING AMPLIFIER

4-40 X 1/8 Screws
Use 2 Mounting Holes	False Front Panel
on Opposite Corners	Uses 2 Front Holes Only

Figure 2 — Rack mounting the PA 250

Cabling

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

R G B H/HV V	R G B H/HV V	R G B H/HV V
RGsB (sync on green)	RGBS	RGBHV

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.

Up to 1000'

PA 250

Front

Rear

Projector

RGB 109xi

Interface

PC Computer

Figure 3 — Typical PA 250 application

1 PA 250 • Introduction PA 250 • Installation 2 PA 250 • Installation 3