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Tabletop use

Four self-adhesiverubber feet are included with the PA 300. For tabletop use, affix one foot at each corner of the bottom side of the unit and place the unit in the desired location.

Rack mounting

For optional rack mounting, do not install the rubber feet. Mount the PA 300 on a 6" deep, 1U high rack shelf (part

#60-190-10 or60-604-10)or a 9.5" deep 1U high rack shelf (part

#60-190-01or 60-604-01).

1.Remove the rubber feet if they were previously installed on the bottom of the unit.

2.Mount the unit on the rack shelf, using two 4-40x 3/16" screws in opposite (diagonal) corners to secure it.

3.Install blank panel(s) or other unit(s) on the rack shelf.

4.Attach the rack shelf to the rack using the supplied bolts.

6" Deep Rack Shelf 1/2 Rack Width Front False

Faceplate

Front false faceplate uses 2

(2) 4-40x 3/16" Screws

mounting holes on opposite corners.

Mounting the PA 300 on a 6-inchdeep rack shelf

PA 300 Peaking Amplifier • Installation and Operation

2-3

Installation and Operation, cont’d

1U Universal Rack Shelf

1/2 Rack Width Front False

Faceplate

Front falsefaceplate uses 2

mounting holes on opposite corners.

(2) 4-40x 3/16" Screws

NUsing screws longer than 3/16” will damage the unit and void the warranty.

Mounting the PA 300 on a 9.5" deep rack shelf

Under-deskmounting

Furniture-mount(under a desk or shelf) the PA 300 using the optional mounting kit (part#70-077-01),as illustrated below.

Under-deskmounting the PA 300

2-4PA 300 Peaking Amplifier • Installation and Operation

1.

Remove two screws from one side of the unit. Retain the

 

screws for possible future use.

2.

Attach one bracket to the side of the unit, using the

 

provided machine screws.

3.

Repeat steps 1 and2 on the other side of the unit.

4.

Hold the PA 300 with the attached brackets against the

 

mounting location. On the mounting surface, mark the

 

location of the four bracket screw holes.

5.

Drill pilot holes 1/4" (6.4 mm) deep and 3/32" (2.4 mm)

 

in diameter in the desk or table at the locations of the

 

mounting bracket screws. The holes should be drilled

 

from the underside or inside (concealed side) of the

 

furniture, where the amplifier will be located.

6.

Insert #8 wood screws into the four pilot holes. Tighten

 

each screw into the mounting surface until slightly less

 

than 1/4" of the screw head protrudes.

7.

Align the mounting screws with the slots in the brackets

 

and place the unit against the surface, with the screws

 

through the bracket slots.

8.

Slide the unit slightly forward or back, then tighten all four

 

screws to secure it in place.

PA 300 Peaking Amplifier • Installation and Operation

2-5

Installation and Operation, cont’d

Through-deskmounting

Mount the PA 300 through a desk or table, using the optional mounting kit (part #70-077-02),as illustrated below.

Through-deskmounting the PA 300

1.

Install the brackets as shown above. Tighten the screws

 

only enough to allow sliding of the brackets.

2.

Mark the opening through which the unit will be mounted

 

— approximately 1.8" by 8.9" (4.6 cm by 22.6 cm).

3.

Cut out the material from the installation area.

4.

Hold the unit, with the mounting brackets attached, under

 

the furniture where it will be secured. Mark where the

 

screws will attach the mounting bracket to the underside

 

of the furniture.

5.

Drill pilot holes 1/4" (6.4 mm) deep and 3/32" (2.4 mm)

 

in diameter in the desk or table at the locations marked in

 

step 4.

6.

Using the four provided wood screws, attach the brackets

 

to the mounting surface.

7.

Slide the unit up and down or back and forth in the

 

mounting brackets until the face of the PA 300 is at the

 

desired height. Tighten the screws that secure the brackets

 

to the unit.

2-6PA 300 Peaking Amplifier • Installation and Operation

Front Panel Features

 

GAIN

PEAKING

 

 

LF

HF

1

2

 

3

PA 300

PEAKING AMPLIFIER

A B

Power LED — Lights when the PA 300 is receiving power.

Gain control potentiometer — Adjusts the amount of compensation for amplitude losses caused by cable resistance.

C

Peaking control potentiometers — provide optimum signal

 

compensation. Separate high and low frequency controls.

 

LF — Provides adjustment to minimize image streaking.

 

HF — Provides adjustment for achieving the best image detail.

Rear Panel Features

100-240V .3A

 

 

 

 

 

 

 

 

 

PA 300

 

 

 

INPUT

 

 

 

 

OUTPUT

 

 

50/60 Hz

R

G

B

H/HV

V

R

G

B

H/HV

V

 

 

 

 

 

 

3

 

 

 

 

 

 

 

1

2

 

A

AC power input connector — Attach a standard IEC power

 

cord (100 VAC to 240 VAC, 50 or 60 Hz).

 

B C

Input BNC connectors — Connect to the input device.

Output BNC connectors — Connect to the output device.

PA 300 Peaking Amplifier • Installation and Operation

2-7

Installation and Operation, cont’d

Cabling

The PA 300 is specifically designed for long cable run applications. For best results, install the amplifier close to the signal source to drive a long cable to the display.

The inputs of the PA 300 are BNC connectors. If the signal source uses a 15-pinHD connector, use an Extron SYM BNCM cable (Extron part#26-533-xx)to make the connection. See the illustration below.

RGBHV

RGBHV

R G B H/V V

RGBS

R G B H/V V

 

RGsB,

 

 

 

 

 

 

RsGsBs,

 

 

 

 

 

 

Component

R

G

B

H/V

V

 

 

 

S-Video

 

 

 

 

 

 

 

R

G

B

H/V

V

 

Composite

 

 

 

 

 

VGA

 

R

G

 

H/V

V

 

 

 

N For component andS-videoconnections G is luma (Y)

To make input and output connections to other devices, do the following:

1.Turn off the PC and the local monitor.

2.Connect the output of the RGB source to the PA 300 input.

3.Connect the PA 300 output to the RGB display device.

4.Turn on the source and display devices, then the PA 300.

5.Adjust the front panel potentiometers to achieve the optimal image quality for your display. See chapter 3, "Adjusting the Display", for detailed instructions.

2-8PA 300 Peaking Amplifier • Installation and Operation

PA 300

Chapter3Three

Adjusting the Display

Signal Compatibility

Potentiometer Adjustments

Adjusting the Display

Signal Compatibility

The PA 300 processes VGA-UXGA,RGBHV, RGBS, RGBsB, RsGsBs, HDTV, and component video signals.

Potentiometer Adjustments

The PA 300 achieves superior amplification by using two independent peaking potentiometers: LF for streaking adjustment and HF for detail adjustment.

The goal in adjusting the PA 300 Gain and Peaking potentiometers is to produce a sharp image (i.e., an image free of streaking or smearing) on the attached display.

An oscilloscope is required for the most accurate gain adjustment, but gain can also be adjusted by observation. The following instructions explain how to adjust the gain with and without the use of an oscilloscope. An oscilloscope is not necessary for the peaking adjustment.

Adjusting gain with an oscilloscope

To adjust the Gain potentiometer using an oscilloscope:

1.Remove the cable from the source and attach a VTG 300 test generator to this cable.

2.Use the White Field test pattern for the VTG 300 setting.

3.Remove the far end of the cable from the projector and attach the oscilloscope using 75 ohm termination.

4.Use an Extron Tweeker to adjust the Gain potentiometer for a 0.7 Vp-preading from white (top) to black (bottom) of the waveform.

5.Once gain is successfully adjusted, replace the source and display cables.

6.See "Adjusting the peaking" on the following page.

Adjusting gain without an oscilloscope

Use an Extron Tweeker to turn the Gain potentiometer until the image reaches the desired level of brightness.

3-2PA 300 Peaking Amplifier • Adjusting the Display

Adjusting the peaking

To adjust the Peaking potentiometers, do the following:

1.Using MS Paint and a spreadsheet, create a testing image on your PC desktop that includes squares, lines, text, and gradations of color. Use the illustration below as a guide.

2.Adjust the LF (low frequency) potentiometer until the image is free of streaking. When the LF is over adjusted, the streaking is the same color as the image, as shown below.

PA 300 Peaking Amplifier • Adjusting the Display

3-3

Adjusting the Display, cont’d

When the LF is under adjusted, the streaking is the inverse color of the image, as shown below.

The potentiometer should be adjusted midway between these two extremes.

3.Adjust the HF potentiometer until both text and icon images appear sharp. When HF is over adjusted, ghosting may appear, as illustrated below.

When the HF is under adjusted, smearing may appear, as shown below.

The potentiometer should be adjusted midway between these two extremes.

4.Alternate between adjusting the HF and LF potentiometers until the display shows a clear and sharp image.

3-4PA 300 Peaking Amplifier • Adjusting the Display