Rebel1 wrote:
> Because of a recent burglary, I am going to install an alarm system
> in my single-family ranch home (no basement)that I reside in alone.
> The considerations (aimed at burglar detection):
> 1. A silent alarm so the cops might catch them in the act,
>
> 2. A silent alarm that signals me if I'm home, so I could defend
> myself with a gun.
>
> 3. Beefed up barriers to entry, like locking bars for sliding
> doors, and high quality door locks.
>
> 4. How easy is it to defeat?
My experience with alarm systems is that I've installed 3 alarm systems
over the past 13 years - twice at my office (which moved to a different
location) and once in my home.
The systems at my office consisted of:
- motion detectors mounted in every room with either an outside
door or a window (sensors mounted in the corner of the room
where the walls meet the suspended ceiling)
- magnetic door sensors on each outside door
Wires were run from these sensors above the suspended ceiling to the
control unit. I performed all this work myself. I bought the sensors
and control unit (DSC 5500) from a local company that installs alarm
systems.
The control unit is designed to call 2 different phone numbers upon
sensing an alarm condition. I programmed the unit to call my home
telephone and the home phone of another key person. I did not subscribe
to an alarm monitoring company because there really isin't any need. If
either myself or the other key person gets the phone call from the unit,
we can use our own judgement as to how to proceed (either go to the
office, call the police or someone else, etc).
In the 12 years that I've had the alarm at the office, there hasn't ever
been a break-in, but there have been false-alarms caused by the motion
sensors (this seemed to happen during very cold winter nights when the
furnace would kick on and blow warm air over the windows, possibly
causing the blinds to move around).
At my house, I only have sensors to detect the opening and closing of
the front and back doors. Each door has a screen door and a "main" or
proper door, and both doors are monitored independantly at both
locations. I have the exact same DSC 5500 unit at home, and I have it
programmed to call my work phone number (because when I'm not at home,
the odds are I'm at work). I've never had a break-in at home, so that
unit has never been in an alarm condition where it's called me at work.
Door sensors are highly reliable and almost never give false alarms.
These alarm systems have keypads that you typically place near your
entrance/exit door. When you enter the premises when the alarm is set,
the keypad will emit a tone until you enter the code to deactivate the
system. If you don't enter the code, it will enter the alarm state in
30 seconds (or what-ever time period you want).
A burglar would also hear the tone upon entering the premises, and he
might decide to just turn around and leave because he knows that a
response will happen within minutes.
The control unit can power a loud horn (that you can place anywhere,
inside, outside, etc) if the unit enters the alarm mode. I don't have
any such horn connected to either of my work or home systems.
My current office location has bars over vulnerable lower-floor glass
windows, but my previous location had about 20 large windows (about 30
inches by 60 inches, double-pane) that had a protective membrane applied
to the inner pane to effectively laminate the glass and make it very
hard to penetrate. The membrane was slightly tinted to make it harder
to see inside and block some solar heat radiation from entering the
office. This lamination is available for residential windows and when I
get new windows for my home I will probably put this lamination on them.
Over the past few years I've been experimenting with cameras (internet
connected "IP" cameras) at home and the office. I have one such camera
on my front porch looking out onto the street. I can program the camera
to monitor the image and can define specific zones to sense any motion
in those zones, and it will send me an e-mail with the picture showing
what-ever is moving in the triggered zone. I therefor have images of
vehicles driving in front of my house, people walking up to my door,
etc.
I can also monitor a live video signal from that camera on my computer
at work if I want. I have a similar camera watching my back door. That
one has a microphone and speaker output (I can hear what's going on, and
I can speak into a microphone connected to my computer at work and have
it come out of the speakers connected to the back-door camera at
home). All of this is done without needing to subscribe to any server
or service. It's a direct internet connection between my office
computer and the cameras at home.
There are "apps" available for iSlave and other smart phones if that's
what you use vs a proper desktop computer. These apps are generally NOT
free - but typically cost $5 and they have a more limited functionality
vs what you can do on a PC.
For a home situation, it's very ergonomic to set up a home PC to perform
the video recording from the camera. As long as the PC isin't stolen,
you'll have a video record of who broke into your home (or who rang your
door bell, etc).
> 5. Camera: Do they really do much good in deterring via their
> visible presence or in identifying a suspect that the cops
> catch?
My brother is somewhat of a video geek and he set up a real video camera
over the entrance to my parents garage (this is a 2-car attached
garage). There is also a bright light over this door. He set up a
video recording system (I think it recorded directly to a DVD-RW) and it
will just record over and over to the same disk each night.
One night it recorded some punk trying to break into the garage. The
camera recorded a nice clear image of the punk. The door was well
fortified so he didn't actually break in. My parents gave the video to
the police. They gave a copy to the local newspaper who put up a link
to the video on their website. After a few days the punk was identified
and he was charged (with attempted break-in I think).
I'm probably going to buy something called a "trail-cam". It's a camera
normally used by hunters and biologists that want to record pictures of
animals in remote locations. These cameras have motion detectors and
have very good night-vision capability, and have batteries that can last
up to a year, and can take thousands of hi-rez pictures over that time.
I would mount this camera to a tree in my front yard where it has a view
of the street. It would take pictures of any punks trolling around at
night looking for cars with unlocked doors.
The bottom line is that you need to ask yourself:
1) How much of any of this am I capable of doing myself (running wires,
buying specific devices, etc). Doing it yourself can save you a lot of
$$$ and you end up with something very customized to your situation.
2) One basic question is -> does the alarm system call a monitoring
service, or does it call you and/or any other appropriate person
(friend, family member, neighbor, etc) during an alarm condition. The
answer depends on (a) how much money you want to save, and (b) are there
people you trust (and who is willing to take the responsibility, and who
is likely to be able to come to your house when you're out of town).
I think it's overwhelmingly better to have "personal" response to an
alarm made by a trusted person instead of a monitoring company.
You could have a reciprocal arrangement with a friend, familiy member or
neighbor: Their alarm system can call you (as a backup contact) if your
alarm system can call them (again they would be your backup contact).
I said earlier that if any sensor is triggered, that the keypad will
emit a tone until the entry code is entered. This tone could be used to
wake you up (if you're home and the sensor is triggered in the middle of
the night). It is possible to place a second keypad in your bedroom
(for example) so you would hear the tone at night.
As for me, I never set my alarm when I'm home. I have no such fear or
expectation of having my home entered by an intruder during the evening
or over-night hours. For one thing, any such attempted entry would
probably wake me up, and second such an evening break-in attempt in my
neighborhood (or even in my city) is just so rare to begin with.