Net Media MM73 User Manual page 56

Q- Can I connect the camera coax to video distribution equipment?
A- NO! Do not connect the F-Connector coax of the camera or Decoder to other video equipment!
Doing so could damage this product and/or the other attached devices! The Decoder ouputs DC
voltage on the coax that other equipment may not be prepared to handle. Each camera and Decoder
pair needs a dedicated point-to-point circuit; nothing else can share the coax. Also, the camera itself will
not work properly with RF splitters, diplexers, and amplifiers. The RCA Video Out jack of the Decoder can
connect to composite video equipment such as monitors, TV's, DVR's, and modulators.
Q- How can I see the camera on my TV without using an expensive security monitor?
A- The composite video signal from the PoC Decoder can be plugged directly into one television's RCA
Video Input jack and viewed when that TV is switched to the proper input. Another option is to feed the
Decoder signal into a modulator. A modulator, such as NetMedia's MM70, changes the video to a UHF
or Cable channel and allows the signal to be distributed to all your TV's along with the existing
antenna/cable/satellite service.
Q- Is there some way I can get One Wire Video™ over coax with other cameras?
A- Yes, the NetMedia PoC Video Encoder and Decoder can be purchased as a set, NM-POCSET, for use with
popular 12V DC cameras. The Encoder will accept the camera's composite video signal and output
about 150mA of regulated 12V DC power.
Q- Why do the light areas of the picture look washed out?
A- The camera's automatic iris must decide how much to open for shadow areas or close for light areas.
When a picture has both light and shadow, the camera adjusts the iris based on the percentage of each
area in the image. If it decides to open more for the shadow portions then the light areas will be
overexposed. In addition, cameras that are designed for low light or infrared sensitivity typically favor
the shadow areas and look more washed out under bright conditions. Try adjusting the image field so
that more light areas are visible and see if the iris closes to improve the picture. It is normal though, that
as the lighting conditions change throughout the day, so will the camera iris and the picture's dark or
light areas.
Q- Why are the shadow areas too dark to see much detail?
A- This is like the washed out question above except opposite. In this case, the camera's automatic iris is
opening more for the light areas at the expense of the shadow areas. Try adjusting the image field so
that more shadow areas are visible and see if the iris opens to improve the picture.Keep in mind though,
that the camera still does need some kind of light in order to see. If necessary, add some lighting to the
dark area to improve visibility.
Q- Will the camera work at distances beyond 100 feet?
A- Though we do not recommend or support doing so, some people find that the camera functions
satisfactorily at distances greater than 100 feet. At that range, the video quality degrades as the cable
length increases but until the power gives out over the next few hundred feet, it may still be acceptable
for your application.
Q-What is the difference between Power over Coax and modulated devices?
A- Both are similar because they enable One Wire Video™ using a single coax. They differ though in their
type of video output signal.Our modulated devices, such as the RM70 (which supplies remote power for
popu;ar 12VDC cameras), output a TV channel that requires a TV tuner to view. This is handy for
distributing the signal to all the TV's with the same coax, splitters, and amplifiers that transmit the local
antenna, cable, or satellite signal. It is more inconvenient though, for using the signal with equipment
that does not have a tuner such as a security DVR or Quad screen display. Our PoC modules and cameras
output a composite video signal that is directly compatible with such equipment. Whole house
distribution can still be accomplished with PoC by modulating the output of the DVR or Quad.
NetMedia, Inc., 10940 N. Stallard Place, Tucson, Arizona 85737 (520) 544-4567 Fax: (520) 544-0800 Email: sales@netmedia.com www.netmedia.com
Frequently Asked Questions
MAN-POCCAM REV0703A