AVALON RF, INC. Page 14 of 15
ODX402/ ODX502/ OODX602 User’s Guide & Operating Manual
Quality mode is more useful to technically inclined or the advanced
user. It gives a more enhanced display of each of the two antennas
input signal levels, the signal quality of each & the combined BER (Bit
Error Rate) of the recovered signal. The BER is a measure of the
overall quality of the combined signal (from antenna 1 & 2). For
MPEG-2, blotchy effect is seen at a BER of about 2 x 10
-3
. The
typical rf level at this point is around –95 dBm, although other factors
like severe multi-path or interference could cause high BER at much
higher signal levels. The normal user should only use this, if at all, to
judge the cause of poor performance or to get a feel of the locations
effects to the wireless link.
Audio Volume Mode shows the current audio volume/ output level
setting. It is only a display of the setting. The value can be changed
through the serial RS232 interface.
OSD OFF mode as it implies does not put any on-screen display.
Please note that even though OSD Menu is off, when a channel is
changed, there will be a brief OSD for 3 secs, indicating the new
channel info, the SID etc. When the lock has been established, the
OSD disappears.
3.2.5 Antenna Use
This digital system uses COFDM modulation that gives a great
advantage of a robust video link. However, there are differences
when compared to a ‘traditional analog’ video system. One of the
main differences is the input signal level permitted for good signal
reception. That directly translates into transmitter power & use of
antennas. The ODX602 receiver has excellent sensitivity allowing use
of small low profile antennas. High antenna gain will saturate the front
end of the receiver & result in distortion of the received signal thereby
causing errors in reception.
Please consult Avalon RF for choice & use of antennas.
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