Rev 2.0 3-Apr-2010 4
5. Connect a video cable from the RX300 receiver BNC connector to an SDI video display and/or
waveform monitor (be sure the BNC cable connector is securely seated into the recessed RX300
connector). In the event that a professional SDI display is not available, an SDI to HDMI
converter (such as the AJA Hi5) can be used to display the HD video on an HDMI compatible
type TV.
6. Adjust the pointing angle by visually sighting at each end of the link until the RX300 blue HD ◙or
orange SD ◙(depending upon video format) is illuminated. The yellow LOK ◙indicator will also
illuminate. While adjusting the pointing angle, minimize the flash rate of the RX300 receiver red
LER ◙indicator. The red LER ◙indicator shows SMPTE CRC (cyclic redundancy check) errors
in the video data stream. With minor readjustment of the pointing angle, the LER ◙indicator flash
rate should be minimized or be completely off. In the event that the link range exceeds the
maximum specified operating distance, a high quality video signal can still be achieved even with
some CRC errors occurring over the link since most result from random chroma/luma pixel errors.
In specific applications where extended range is required the acceptability of the video quality
may be more important than achieving a zero CRC error rate.
7. Once the correct pointing angles are found, the units will transport video reliably.
TX and RX Attenuation Adjustment
There may be some physical environments (such as highly reflective building surfaces, or over shorter
ranges less than 25 meters) where it becomes necessary to adjust the receive and/or transmit attenuation
settings. The VuLink TX300 transmitter and RX300 receiver have internal attenuation setting switches
(16-position, pc-board mounted) on their baseband printed circuit boards. In order to access the
attenuation switches, the hinged enclosure top cover must be unlatched at the rear. Figure 5 shows the
latch at the rear of the enclosure.
a (Rear Latch Closed) b (Rear Latch Open)
Figure 5a & b
Rotate the latch handle ¼ turn counterclockwise and tilt the latch arm back slightly to release the latch
from the keeper on the cover (Figure 5). The entire top cover can then be lifted and rotated up from the
rear (the cover hinge is at the front of the unit). Figure 6a shows the location of the attenuation
adjustment switch (the location of the switch on the TX300 is slightly higher on the pc board than on the
RX 300).
