ORACLE V1.4 ©2007-2008 DIGITAL PRODUCTS COMPANY
P
AGE
8
Jan-2008
F
REQUENTLY
A
SKED
Q
UESTIONS
Q: Can I power Oracle from the same 12V battery that operates my two video receivers?
A: Yes you can. As a bonus, Oracle’s low battery alarm will tell you when the battery needs
attention.
Q: To reduce polarization reception problems, I would like to combine a vertical polarized antenna
with one that is horizontally polarized. Will this help my 2.4Ghz “mobile” application?
A: Perhaps, but it is not the ideal solution. To help minimize polarization dropouts, a better
method would be to use circularly polarized patch antennas on your receivers. Then space these
apart for spatial diversity.
Q: I have a wireless public address system that I would like to improve with a diversity antenna
setup. Can I use two audio receivers (no video) with Oracle?
A: No. Oracle needs the video signals to perform the intelligent A/V switching.
Q: I noticed that the audio level changes after the A/V sources have switched. Why is that?
A: Although Oracle has a video balance adjustment, it does not have one for unmatched audio
levels. If the problem is excessive, try inserting a series resistor on the audio signal of the loudest
source. The exact resistor value will require experimentation (start with 1K ohms and go from
there).
Q: There are two video outputs but only one set of audio outputs. How do I install a second audio
output?
A: The audio output is specially buffered and can drive two audio inputs. All that is needed is an
RCA “Y” cable, which is available from electronic suppliers.
Q: Sometimes I still see bad video from my wireless receivers. I thought Oracle prevented such
problems?
A: Oracle determines which video source is error free and then switches to it. However, if both
sources are corrupt, then the video will be poor until at least one source has good video.
Q: Can I use the system with HDTV signals?
A: No. Only composite NTSC/RS-170 and PAL/CCIR signals are supported.
Q: Although the video will look fine, occasionally my receiver’s audio will have static noise in it
or will fade away. It is definitely RF signal related. Why does it occur?
A: That is a common behavior on some video receivers due to the way the audio sub-carrier is
processed. Because Oracle only analyzes the video signal, it cannot correct bad audio.
