Avocent Emerge MPX Installer/User Manual page 62

48 MPX Extender Installer/User Guide
Table 4.3: Methods for Fine Tuning (Continued)
If you are fine tuning...
wireless transmission
power settings
Sharpness of
computer graphics
Then choose...
Maximum Transmit Power field on the Media LAN Settings page. This
setting may be set separately for transmitters and receivers. Figure 4.3
illustrates this web page.
The range of values at the transmitter is determined by the country code
and wireless channel. The range of values at the receiver may be wider
than the transmitter because the receiver is not explicitly configured for
country code and wireless channel settings. Nonetheless, the receiver
will not exceed legal power limits at any time. The Actual Antenna Power
field of a receiver's Connection Status page displays the receiver's true
radiated power level.
Lower settings allow transmitters to be placed more closely. This is useful
when multiple video streams are required. Higher values allow for
increased distances between transmitters and receivers. In addition,
Avocent offers optional extended distance antennas for this purpose.
The default power setting may overdrive radio receivers when MPX
transmitters and receivers are positioned in close proximity to each other,
within ten feet or less, as might be the case during initial configuration
and testing. Over-driven signals may result in lost frames or in extreme
cases, in dropped connections. To avoid such errors, select the lowest
setting that results in a stable, acceptable image. Remember to raise
transmit power levels when extenders are placed in their final locations.
Depending upon environmental conditions, you may find it beneficial to
configure receiver transmit power settings slightly lower than the
transmitter. This will reduce contention among receivers and ensure that
the transmitter has the most dominant signal.
Luma Chroma Percentages and Content Type on the Tuning Parameters
page of the transmitter. Figure 4.1 on page 45 illustrates this web page.
The luma chroma setting affects the way in which the transmitter
processes luma and chroma information in the input video stream. By
default, 67% of the output stream is dedicated to luma information and
33% of the output stream is dedicated to chroma information. This ratio is
well suited for a combination of motion video and some computer
graphics. For applications that are heavily slanted toward still graphic
images with sharp edges, you may have better results by increasing luma
to 80%. Experiment with the slider bar to find the settings that are best for
your application.
The content type may be used to select an encoding algorithm that is
geared toward computer graphics (still images) or motion video.