Check this Discussion Group
Should I choose Wireless or
Wired Cameras for my security system?
There are many retailers offering
wireless cameras these days, and boasting about the range, and quality
as well as the ease of installation of these cameras...However, they
neglect to inform you of the MAJOR FLAWS of a wireless camera
Wireless cameras are not
secure! These cameras are easy to install, but they can
allow a professional, or even an amateur who has a few dollars and
access to a Radio Shackฎ store, to see inside your house or business,
and case the robbery from the outside.
This defeats the purpose of a Security
Surveillance System!!! Now you never know who is watching you
on your own cameras!
These cameras operate on very crowded frequency bands which can be
interfered with by a Mobile Phone, Wireless Access-Point, Wireless
Network Card, or many other wireless devices. This also demonstrates how
easy it is to disable the camera system from outside of your home or
Wireless cameras are not stable. The
pictures flip, and the least disturbance in the area, such as a person
walking by the receiver can disturb the picture.
Finally, the wireless cameras broadcast on the same frequency. You can
only have one wireless camera in an area. There are multiple frequency
cameras that come with multiple frequency receivers, but not only do the
cost 3-4 times more, they are also not reliable, and suffer from channel
drift as the video from one channels drifts into the next.
In our our experience a Wired
Surveillance System is the only solution!.
You can only have
CAMERA in an area, as they broadcast on the same frequency. If
you have two or more, all you will get is noise when you go to view them
on your monitor.
There are cameras that are multiple
frequency cameras, and they require multiple frequency receivers. The
start in price at $120.00 US each. They are limited to 4 channels,
Unfortunately, apart from being expensive, they also suffer from channel
drift, as the signal from one channel drifts into the other channels.
Not an ideal set-up at all.
There is one really good reason to
purchase a wireless camera. That is for its ability to be set up quickly
without stringing wires. So we suggest you consider, 3 wired cameras and
one wireless camera to take advantage of this capability to move one
camera around easily, without compromising the entire set-up.
Frames per Second
capture cards are 30 frames per second cards. (NTSC -
North American Video Standard) When they are being used to
run PAL cameras (European Video Standard) the frames per
second rate is 25.
attach one camera to the card then it will view and record
at 30 frames per second. If you attach two cameras, that
resource is shared between the two cameras, and you can
view and record at 15 frames per second. If you attach
four cameras, then you can view and record at 7.5 frames
Why frames per second
Well, it is, if you are using the card to study the mating
habits of hummingbirds!
But we believe that the
object in good surveillance is to be able to obtain high
quality images that you can email to the police, print out
on your color inkjet, and that can be used to prosecute an
When you are running four cameras on a 30 fps card, an
illegal act that takes 1-2 seconds, will produce 7 - 15
pictures that you can use to prove your case to the
A 30 fps card is by far your
most cost effective choice for professional surveillance.
If you absolutely need higher frame rates, consider buying
more than one card, and then you could have up to 4 cards
in one machine, driving 4 cameras, each with 30 frames per
second viewing and recording.
As soon as you go to the
internet viewing, however, your frame rate will drop
again, because the internet slows down the process.
Bottom line, 30 frames per
second total resource is most likely all you need in 95%
of the time you need surveillance.
Want to drive 8 cameras -
Purchase 2 cards - you need 2 PCI slots
Want to drive 12 cameras - Purchase 3 cards - you need 3 PCI slots
Want to drive 16 cameras - Purchase 4 cards- you need 4 PCI slots
What are the minimum computer
specifications for running a DVR system on my PC?
This Section is Under Construction
Each card we sell has its own minimum system
Our Dico 30 frames per second card
233, 64MB RAM, 5GB HDD, Network Card/Modem
Our 60 frames per second card
Our 120 frames per second card
Our USB DVR adaptor
Our USB 2.0 adaptor
What is a Dedicated PC?
A Dedicated PC, is a PC that is not
used for any other purpose. A DVR PC constantly needs access to all of
the PC's resources. Because of this, operation of any other programs,
surfing the internet, or any other activity aside from running the DVR
program, can cause poor performance, failure to record video properly,
or system failure.
What is the difference between
a CMOS and a CCD Camera?
To put it simply, the difference is
in the quality of the image sensor.
A CMOS camera has a less-expensive
image sensor. The other benefits of CMOS are size, and low-power
consumption. Most CMOS cameras can even be operated for several hours on
a single 9-volt battery! The low-power consumption comes at a price
however. CMOS cameras have a lower resolution and less color quality
than the CCD cameras.
However, the CCD Cameras are much more sensitive
to power fluctuations, due to the fact that the CCD Sensors have 4
integrated processors compared to the one processor found on a CMOS
sensor. CCD cameras usually have much better picture quality, resolution
and color balance. The drawback of a CCD camera is high-power
consumption and sensitivity to minute voltage changes It is highly
recommended to use a AVS battery backup unit for the CCD Camera Power
adapters and DVR PC.
How should I place my cameras
in order to ensure I catch video that will capture the most relevant
While this is a very broad question,
here are some tips at placing your cameras...
Never angle a camera to look straight down.
A camera that is pointed straight
down, will only catch the top of a perpetrators head. The camera will
most likely miss many of the distinguishing characteristics that can
be used to identify a person later if necessary.
Always make sure to have a camera facing all entrances
It is a fact, that the best time to
catch the facial features of an individual is during their entrance
into the building, whether it is your home or your business. Other
cameras can catch the act of someone stealing, however, without the
critical entry-shot you may not be able to identify the individual
Never allow direct sunlight to touch the lens of the camera
Regardless of which cameras you use,
make sure that the cameras are never mounted in such a way, that
sunlight will directly shine into the lens. This will cause the Image
sensor to discolor and fail. Direct sunlight will also immediately
void any warranty.
I/R Cameras within 20 ft. of subject being viewed
I/R Bulbs emit an invisible light
spectrum that will illuminate a subject even in complete
darkness...however, the light will only project out 20-40 ft. to
illuminate the target
Always plug cameras
into a surge suppressor or Battery Back-up unit
Cameras are extremely sensitive to
voltage changes and can fail prematurely. Voltage changes will also
void the cameras warranty. Plug the power adaptors into a power bar
with surge protection.
Select a lens that
will provide no wider of a field of view than is needed.
The wider the field of view, the
smaller objects in the camera will appear. Visit our eBay Store lens selection
page to help you select the appropriate lens for your application.
I don't see any 12-16
camera kits...are they available?
YES, simply add together
any 2, 4 or 8 camera systems in order to build a 10, 12, 14, 16, 18,
20, or 24 camera system.
What is the benefit of a
DVR system as opposed to a traditional time-lapse VCR CCTV (Closed
Circuit Television) system?
(computer-based) system gives several benefits over a standard VCR-based
First and foremost, the DVR takes the majority of human error
out of the equation. With a traditional system, a staff member or person
in charge of the security system would have to remember and be present
at the same time each day, to change the tape in the VCR. Commonly, due
to unforeseen circumstances, or neglect or even simply the fact that a
tape is currently being reviewed, the tapes in a traditional system do
not get changed or are not always recording (due to the limitation of a
VCR). Without a tape in the system, it cannot record, and therefore,
anything that would happen at your home or business would not be
A surveillance system is in place to constantly monitor, and
keep record of all occurrences. If there are gaping holes in the actual
recorded time, then this leaves great chances that important
information, such as cars entering or leaving the gas station, or
customers walking out of your store with items they did not pay for, or
an employee reaching in their pocket would not be on the tape.
case of a DVR System, it is always running, and always recording (if
configured properly). Even while you are reviewing the previously
recorded video, it still continues to record the data! This provides
a great advantage, as your employees, family members or customers may be
able to see, while you are reviewing a pre-recorded cassette in a
traditional system, and may take advantage of the momentary lapse in
Why would I need a Surveillance
Surveillance systems are used for many
For businesses, a surveillance system
may be used for monitoring employees and productivity, safety of
employees, documenting customer visits, preventing fraud and theft, and
providing court documentation if theft were to occur.
For homes, a surveillance system may be
used for watching your children while you are at work or inside the
house, watching your pets (for extreme pet lovers), monitoring your home
while you are away on a trip, watching for delivery of packages, monitor
a philandering spouse, or making home videos of those times when you
just don't have a camera handy.
In the world today, the need for a CCTV
Surveillance System is increasing. Suspicious activity can be recorded
and reported immediately to the authorities. Cameras also help us catch
the perpetrator or save ourselves from embarrassment of false
What is a LUX in the camera
To see properly, a CCTV camera requires
a certain amount of light produced by natural or artificial
illumination. B/W cameras work with any type of light sources, but color
cameras need lights that contain all the colors in the visible spectrum
for best color imaging.
The amount of light is defined by LUX
(Lumens per Square Meter). One LUX is one candle light volume at one
meter distance. Followings are some examples of natural lights expressed
Natural LUX Examples
Very dark day:
View the LUX ratings of your camera to
determine the LUX necessary for your application.
How do I select a Camera?
Selection of the best camera to suit
your needs should be based on where the camera is to be located, and the
light conditions of the location.
Dome Style Camera
Usually used in an indoor business or home
environment. Usually the Dome cameras curved shell helps to
disguise what direction the camera is facing.
You might see these
cameras commonly in Apartment buildings, Retail Stores, Hallways,
Convenience Stores, Gas Stations, and many other applications
A Dome camera can be
mounted easily on the ceiling or the wall, and generally will
rotate 360ฐ during installation. The cables for the camera are
generally fed through a small hole in the wall or ceiling, so no
wires are visible after installation.
Bullet-style Weatherproof Cameras
Usually used in an
indoor or outdoor business or home environment. The weatherproof
housing of this camera is excellent for most outdoor
installations to -30 degrees. For use in harsher climates, a CS
Mount camera with outdoor housing should be used
You might see
these cameras commonly in Apartment buildings, Retail Stores,
Hallways, Convenience Stores, Gas Stations, and many other
majority of these bullet style cameras have IR illumination, for
use in pitch black night-time environments!
C or CS - Mount Cameras
These cameras can be
used in an indoor or outdoor environment (when outdoor enclosure
These are the most
common cameras for a professional installation, banks, jewelry
stores or an installation where lens changes may be necessary.
C and CS - Mount
cameras are often sold without lens, as each application will
require a slightly different lens in order to capture the desired
What if I don't see
the camera I want?
DuncansOnline is constantly expanding
our line of products. We are listing them as fast as we can on eBay.
Please check back to our eBay store often to discover our new products and review our older
What is the
difference between wired and wireless cameras?
Wired cameras have a video cable that runs
from the camera to the video input jack on your recording or viewing device.
Wireless cameras have a built-in transmitter that sends the video signal to
a receiver. The receiver connects to the video input jack on your recording
or viewing device.
What is the range of the wireless cameras?
The standard wireless cameras have a range
up to 700 feet, depending on the number and type of objects you are
transmitting through. The commercial grade transmitter has a 15 mile line of
sight range (1000-3000 foot indoor range). Line of sight means there is
nothing between the transmitter and receiver, for example building top to
Is a special recorder or monitor needed?
Any recording or viewing device with video
input capabilities can be used, for example, a VCR, TV, camcorder or
How long can
the cameras record?
The amount of recording time is dictated by
your recording device. A standard VCR can record for up to 10 hours if a
T-200 tape is used. We also offer long play recorders that will record for
24 to 960 hours on one tape.
What do resolution & lux mean?
Resolution measures the cameras ability to
reproduce an image. The higher the resolution, the better the picture
quality. Lux is the measure of light the camera requires to reproduce an
image. The lower the number the less light the camera requires to reproduce
Do the covert cameras have audio?
Audio is only available to law enforcement
agencies due to federal law Title 18, Section 2512.
Will cordless phones interfere with the
Cordless phones that operate in the 900MHz
frequency will not cause interference with our wireless cameras. Cordless
phones that operate in the 2.4GHz frequency will cause interference with our
What is the difference between a Digital
Video Recorder (DVR) vs. an Analog VCR based video surveillance system?
The Digital Video Recorder (DVR) system
records high resolution digital images to a hard disk drive (HDD) and
eliminates the requirement of maintaining VHS tapes. Since the video images
are stored digitally, the image quality will not degrade overtime, as would
a VHS tape when recorded over multiple times. The time saving intelligent
search capabilities of a DVR will enable the user to locate the desired
video clips via user defined parameters (camera, time, date, etc.) vs. Fast
Forward and Rewind functions of a VCR.
What is a DVR
DVR Cards enable the user to convert their
computer into a Digital Video Recorder. The DVR Card(s) is typically
installed in an available PCI slot of a computer. DVR cards are bundled with
video surveillance software which allows the user to record and display
multiple cameras simultaneously from the camera site or a remote location.
How long will a DVR record for?
Estimated hours of recorded video at 320 x
240 resolution utilizing the WAVELET Compression option.
Can a DVR record upon detecting motion or
via a schedule?
Yes. Each camera can be configured
independently to record upon video motion detection or via a schedule.
How do I access my video from a remote
The user may access the video from a remote
location via a standard modem connection or a high speed internet/intranet
What is the viewable area for your cameras?
The viewable area is determined by the
cameras lens size (see lens chart below). Our covert cameras incorporate a
||Field of View
||Best Picture Distance
||Viewable Area @ Given Distance
||92 degree F.O.V.
||10 15 feet
||14 (W) x 10 (H) @ 10 feet
||57 degree F.O.V.
||20 - 25 feet
||16 (W) x 12 (H) @ 20 feet
||38 degree F.O.V.
||25 - 30 feet
||18 (W) x 14 (H) @ 30 feet
||26 degree F.O.V.
||35 40 feet
||16 (W) x 12 (H) @ 40 feet
||15 degree F.O.V.
||50 60 feet
||15 (W) x 12 (H) @ 50 feet
Based on a 1/3 CCD Camera