NetMedia POCLAMP-DI - Manual (Page 4)

MAN-POCLAMP REV1002A
NetMedia, Inc., 10940 N. Stallard Place, Tucson, Arizona 85737 (520) 544-4567 Fax: (520) 544-0800 Email: [email protected] www.netmedia.com
Frequently Asked Questions
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.
Q- What do the switches inside the “D” Day/Night camera adjust?
A- The Day/Night camera comes with a switch connected inside to adjust some of its performance characteristics. The switch
functions are listed below (Figure 4). The default settings (All OFF) are usually best but adjusting these may be helpful
under certain conditions. The AGC switch will force the camera to remain in color mode instead of changing into black and
white mode when the light level drops below its normal crossover threshold.
NM-POCL
AMP
Figure 4 - Day/Night camera switch functions. AGC ON will prevent the camera from switching into BW mode. Default: All OFF.
Switch 1: BLC - Back Light Control
Switch 2: AES - Auto Iris
Switch 3: AGC - Auto Gain Control
Switch 4: Unused
Default: All OFF (Away from numbers)