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EXTENDER VGA TRVGA-300-P
DESCRIPTION The TRVGA-300-P is designed for active transmission of the VGA signal via twisted-pair cable for the distance up to 300m. The transmitter converts the VGA signal, what enables its transmission via twisted-pair cable. Three pairs of wires allow to RGB signals transmission, the fourth pair - the synchronization of the transmission.
The device is equipped with overvoltage protection of the symmetrical line. The transmitter and receiver are sold as a set and a both devices need to be used for complete channel transmission.
Transmitter and receiver are in the kit.
SPECIFICATION
Device type :
Active / Transmitter
Number of channels :
1 VGA
Power supply :
12 V / 70 mA (power adapter not included)
Video transmission range :
max. 300 m
Symmetrical socket impedance :
100 Ω
Connectors type :
VGA Socket
Symmetrical socket type :
RJ-45 (8-pin, 4 pairs) Socket
Weight :
0.078 kg
Dimensions :
118 x 30 x 48 mm
Device type :
Active / Receiver
Number of channels :
1 VGA
Power supply :
12 V / 170 mA (power adapter not included)
Video transmission range :
max. 300 m
Symmetrical socket impedance :
100 Ω
Connectors type :
VGA Socket female
Symmetrical socket type :
RJ-45 (8-pin, 4 pairs) Socket
Weight :
0.078 kg
Dimensions :
118 x 30 x 54 mm
Main features :
Short-circuit protection Signal correction
Resolution :
1920 x 1200 / 80 Hz @ 100 m 1024 x 768 / 60 Hz @ 300 m
Manufacturer / Brand :
DELTA
Guarantee :
3 years
PRESENTATION
Transmitter and receiver respectively:
Transmitter and receiver - top view:
The switchers settings for different twisted-pair cable length:
The TRVGA-300-P transmitter and receiver schematic diagram:
1) TRVGA-300-P TRANSMITTER 2) TRVGA-300-P receiver 3) Computer 4) Monitor
Each of RGB channels (each color) is transmitted via one pair of the twisted-pair cable. The length of the particular pair of wires in twisted-pair cable can be different from others. For long distances the differences are considerable. It causes the colors shift on the image. It is visible especially for long distances. In case of 300m distance the colors shift can be equal even two pixels. The resolve of the problem is the same length of each pair of wires for each RGB channel. To do that, we have to divide the distance between the transmitter and the receiver into three equal parts. For each part, it's necessary to change the pair of wires for the particular RGB channel. It means that each RGB channel is transmitted via three different pairs for the whole distance of the cable. This idea is presented on the picture below. This is not necessary to change the pairs for synchronization transmission.
Schematic diagram of the pairs length compensation idea (crossover solution):
1) Transmitter 2) Receiver 3) Synchronization
The other way to eliminate the shifted colors problem is increase the length of the shorter pairs of wires. In this case is the necessary to check the length of the particular pairs. The simple way to do it is the white line test. We can generate the test image (for example in "Paint" application) as follows: on the monitor screen draw the vertical white line (1-pixel width) on the black background. If the shifted colors problem occurs, we will see the colors shifted lines - see the picture below.
Test image after twisted-pair cable transmission - the shifted colors problem:
1) White vertical line 2) Testing signal from the computer 3) The shifted RGB colors problem 4) Image from the monitor
If the resolution equals 1280x1024 pixels and vertical line frequency is 60Hz, the horizontal line time is 14,6us. This is 11,4ns for the pixel (14,6us / 1280). The electrical current speed in the twisted-pair cable is about 192mlns m/s. If the shift is equal 1 pixel, the shortage of the pair length is 2,19m (192mlns m/s * 11,4ns * 1). In case of 2 pixels it equals 4,38m. The length of the pair of wire has to be increase if the proper RGB channel is shifted (on the right side of tested line). See the picture 3b. The length compensation allows to eliminate this problem. In practice the shifted colors problem doesn't exist below the distance of 50m. The length differences of the pairs can be measured by ohmmeter, too. The shorter length means smaller resistance.
Wiring sequence inside the plug (based on colors):
FILES PACKAGE Dimensions (L x W x H): 120x65x65 mm Package: Carton Gross Weight: 0.170 kg
COMPONENTS OF WORKING WITH: TRVGA-300-P
Net: 0.00 EUR
Gross: 0.00 EUR
Weight: 0.00 kg
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