Extron electronic RGB 440 Jumpers, Jumper position guidelines, Sync processing switches

Figure 3

Remove 2 connector nuts

PC board (inside case)

Remove 7 screws

Installation and Operation Installation and Operation

The Extron RGB 440 is a 300 MHz universal analog computer-video and audio interface designed to connect workstations and PCs to large screen display/audio systems. With an Extron MBC (monitor break- out cable) or an MBC buffer, the computer’s local monitor may be used while the RGB/BNC output goes to a large screen. Analog input can be from VGA, Mac, XGA, XGA-2, Quadra, Sun, SGI, or another source. Contact Extron for information regarding specific computer cabling needs.

The RGB 440 may be mounted under, or on the side, of a table or desk using the included Under Desk

Sync Processing (DDSP). The Sync processing switch module contains two DIP switches labeled SERR (left switch) and DDSP (right switch). The Serr switch in the up position (enabled) will result in the removal of serration pulses from the output composite sync signal (does not affect SOG, H or V outputs). The DDSP switch in the up position (enabled) provides Digital Display Sync Processing, which may be required for digital display devices which exhibit an unstable display. With DDSP enabled, the H Shift control (F) on the front panel is defeated.

Mounting Kit, as shown in figure 1 and as detailed in the kit’s documentation (68-461-01). Drill four pilot holes: front-to- back, 2.5” apart, and side-to-side, 6.45” apart.

Descriptions of front and rear panel LEDs, controls and connectors follow. The letters to the left of the descriptions match the circled letters in figure 2 below.

A. Power LED - On = power and video sync

Jumpers

RGB analog signals passing through coax cables may experience signal loss depending on the quality and length of the cable. The signal loss occurs across all frequencies but primarily higher frequencies. Boost/ peaking jumpers located inside the RGB 440 (figure 3) provide a way to compensate for these losses.

Slide cover forward and lift

pulses are present.

B. Audio input connector - 3.5 mm, stereo jack (tip = L, ring = R, sleeve = ground).

C. Analog video input connector - Input connector for MBC buffer, LBC, or MBC cable from computer.

D. MBC Power output connector - Provides power for MBC buffer if required.

E. Termination switch - Provides 75 ohms video input termination if no local monitor is used.

F. H-Shift control - Shifts the image horizontally on remote display device.

CAUTION Disconnect power before opening the RGB 440.

To open the RGB 440, remove the mounting brackets (if attached), remove six screws on the sides (if not removed with the mounting brackets), one screw on

the bottom, and two connector nuts

as shown in figure 3. There is one jumper header for each of the RGB

color signals, J8 = red, J9 = green and J10 = blue. Each header provides three possible jumper positions: unity gain (0.7V p-p),

0.8V p-p and 0.9V p-p.

G. Sync processing DIP switches

Serr = Serration pulses enabled when up.

Figure 1

Cable quality/length along

with video signal frequencies will

DDSP = Digital Display Sync Processing enabled when up.

H. Power input connector - The input voltage range is 12 to 24 volts AC or DC. I. RGB BNC output connectors

J. Sync BNC output connectors

K. Audio output connector

have a big impact on the jumper settings. Set up the jumpers just prior to securing the RGB 440 in place.

Jumper position guidelines

0.7V - Short cable runs

0.8V - Long cable runs, signal gain & peaking for all frequencies

0.9V - Long cable runs & high frequency video signals

High frequency signal boost and peaking compensates for high frequency signal loss due to cable capacitance and bandwidth loss.

Using the captive screw audio output connector

The RGB 440 Interface has a single 3.5 mm, captive screw receptacle along the bottom right side of the rear panel ((K) on figure 2). The audio receptacle has five contacts, and is labeled for left (L), right (R), polarity (+/–), and ground.

A 3.5 mm captive screw connector (part number 10-319-10) is supplied with the RGB 440. The connector must be wired to the output audio cables using the captive screws inside the connectors (figure 4A). The audio connector is then plugged into the output connector on the rear panel. Figure 4C shows three methods of wiring the output connector.

When making connections for the RGB 440 Interface from existing audio cables, see figure 4B. The round audio connectors are shown with the top one (tip and sleeve only) for unbalanced audio and the bottom one (tip, ring, and sleeve) for balanced audio. The ring, tip and sleeve markings are also used on the captive screw connector diagrams in figure 4C. Use these examples as a guide for making audio cables.

Figure 4A	Figure 4B	Figure 4C
	Tip
	Sleeve

Figure 2	Tip (+)
	Ring (-)
	Sleeve

Sync processing switches

Video projectors of different types or from different manufacturers may have slightly different sync pulse requirements. Sync processing DIP switches on the RGB 440 front panel (G) enable the user to modify output sync by enabling or disabling vertical sync serration pulses and enabling or disabling Digital Display

____ NO SLEEVE means NO CONNECTION. Wiring errors or plugging the audio connectors incorrectly

may damage the audio output circuits.

Extron • RGB 440 Interface • User’s Guide	Extron • RGB 440 Interface • User’s Guide
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