Extron electronic MTP R 15HD RSA D user manual Receiver Considerations, Skew Delay Compensation

Installation and Operation, cont’d

Audio/RS-232 cable termination

	Tx Rx		Tx Rx
		RS-232
		Device	Bidirectional
	Tip
Do not tin the wires!		Ground ( )	Ground ( )
	Ring
		Transmit (Tx)	Transmit (Tx)
	Sleeve
		Receive (Rx)	Receive (Rx)
Mono Audio Output
			RS-232 Output

Figure 2-7 — Captive screw audio/RS-232 connector wiring

CThe length of the exposed (stripped) portion of the copper wires is important. The ideal length is 3/16” (5 mm). Longer bare wires can short together. Shorter bare wires are not as secure in the direct insertion connectors and could be pulled out.

Receiver Considerations

NEach transmitter in a system requires a separate receiver.

NUp to seven standard receivers (MTP RL 15HD RS and MTP RL 15HD A, with or without SEQ) can be connected in series between the transmitter and the MTP R 15HD RSA D. This daisy chain is accomplished using the standard receivers' Buffered Output connectors.

The total distance from the transmitter’s TP output to the last receiver in the chain should not exceed the recommended distance for the resolution being used.

NThe receivers' buffered outputs do not provide pre-peaking control. The total recommended distance for an entire daisy chain is the same as for a single transmitter and receiver. The transmitter's Pre-Peak switch has the same effect on the recommended transmission distance for a daisy chain as for a single transmitter and receiver.

NSee the recommended transmission ranges in the table on page 1-4. The recommendations in the table apply equally for a single transmitter and receiver and for a transmission daisy chain. For example, the maximum suggested range for 1024 x 768 video is 300’ with Pre-Peak off and 500’ with Pre-Peak on for either one transmitter and one receiver or one transmitter and three daisy-chained receivers.

NFor daisy-chained units, the first receiver in the chain must be at least 100’ from the transmitter when the Pre-Peak switch is on.

NFor daisy-chained units, any receiver in the chain closer than 350’ may experience some form of over-peaking when the Pre-Peak switch is on.

Skew Delay Compensation

CAT 5/5e/6 TP cable can lead to registration errors between the red, green, and blue video signals. Pair skew can be measured with test equipment or identified by viewing a crosshatch test pattern with a critical eye to determine if either the red, green, or blue video image leads (appears to the left of) the other two video images.

Try using the following methods to minimize or eliminate pair skew:

•Switch to Extron’s Enhanced Skew-Free A/V UTP cable.

•Add a skew compensation cable equal to the length of pair skew to the receiver’s output.

•Install an SEQ 100 15HD Skew Equalizer on the receiver’s video output and adjust the skew for the leading video image.

2-12 MTP R 15HD RSA D • Installation and Operation MTP R 15HD RSA D • Installation and Operation 2-13