On Mon, 10 Nov 2003 18:05:49 GMT, Dick Locke
wrote (with possible editing):

On Sat, 08 Nov 2003 09:24:12 -0800, Panama wrote:

I'm looking for design ideas and components for an intrusion alarm for
the boat. A friend bought 2 IR xmit and 2 IR receiver units to mount
in the cockpit, but my thought is that irregular sunlight bouncing off
waves, etc is going to set this arrangement off.

The previous owner of our boat installed two radio shack motion
detectors on the overhead aimed at the entry hatches. I haven't felt
the need to use them yet, but I wonder if anyone has some comments on
that approach. We have a cat on board but haven't trained it to bark
yet.

He also installed a switch for major deck lighting at the main
stateroom berth. I think that would help in a crowded anchorage.

Two problems:

1. The cat might set off the motion detectors.
2. RS isn't known much for quality.

Paradox DG75 are reliable motion detectors with pet immunity, but I'm
not at all sure how they would hold up in a marine environment.
--

Larry
Email to rapp at lmr dot com

You would want door contacts for the doors of course. I would recommend
dual-tech motion detectors if you are going to use them to keep false alarms
down. The IR has to be set off as well as the micro wave for it go in to
alarm. This means that light or heat that would set off the infra red would
not set off the microwave. A bird that would set off the microwave (
Motion) would not set off the infra red but a human walking would wet off
the infra red heat and the micro wave motion. I would also recommend going
wireless to keep from having to run wires and it would be easier to move the
sensors later if wanted. The alarm system can be connected to the dock
phone line to dial out to where ever you want or it can be local on the boat
only and sound an alarm there.

There are many possibilities of ways to do this. I would start with what
you want the end result to be and design backward. It is easy to do.

John Mears
"Panama" wrote in message
...
I'm looking for design ideas and components for an intrusion alarm for
the boat. A friend bought 2 IR xmit and 2 IR receiver units to mount
in the cockpit, but my thought is that irregular sunlight bouncing off
waves, etc is going to set this arrangement off.

You would want door contacts for the doors of course. I would recommend
dual-tech motion detectors if you are going to use them to keep false alarms
down. The IR has to be set off as well as the micro wave for it go in to
alarm. This means that light or heat that would set off the infra red would
not set off the microwave. A bird that would set off the microwave (
Motion) would not set off the infra red but a human walking would wet off
the infra red heat and the micro wave motion. I would also recommend going
wireless to keep from having to run wires and it would be easier to move the
sensors later if wanted. The alarm system can be connected to the dock
phone line to dial out to where ever you want or it can be local on the boat
only and sound an alarm there.

There are many possibilities of ways to do this. I would start with what
you want the end result to be and design backward. It is easy to do.

John Mears
"Panama" wrote in message
...
I'm looking for design ideas and components for an intrusion alarm for
the boat. A friend bought 2 IR xmit and 2 IR receiver units to mount
in the cockpit, but my thought is that irregular sunlight bouncing off
waves, etc is going to set this arrangement off.

On Sun, 9 Nov 2003 20:08:43 -0700, "Bob La Londe"
wrote:

There are a couple guys who hang out in news:alt.security.alarms who have
done some really comprehensive boat alarms including monitoring using
cellular communications designed for alarm purposes.

Obviously communications may not work when off the coast of some desert
island in the middle of nowhere, but it works well when at your home
anchorage.

Although this isn't an alarm as such, more along the lines of
intrusion prevention for foreign anchorages, while doing a Google
search the other day I found where someone sells an electric fence
charger/energizer for boat railings. With a bit of imagination I would
think satisfactory electrical return paths could be worked out to
allow use of a standard cattle unit.
Certainly has a lot of appeal and beats Slocum's carpet tacks.
The attempted intruder also acts as his own alarm as the YELP should
be able to be heard for some distance. (judging from my own first
encounter with an electric fence..."Now how bad can this be?")

Kiyu



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On Sun, 9 Nov 2003 20:08:43 -0700, "Bob La Londe"
wrote:

There are a couple guys who hang out in news:alt.security.alarms who have
done some really comprehensive boat alarms including monitoring using
cellular communications designed for alarm purposes.

Obviously communications may not work when off the coast of some desert
island in the middle of nowhere, but it works well when at your home
anchorage.

Although this isn't an alarm as such, more along the lines of
intrusion prevention for foreign anchorages, while doing a Google
search the other day I found where someone sells an electric fence
charger/energizer for boat railings. With a bit of imagination I would
think satisfactory electrical return paths could be worked out to
allow use of a standard cattle unit.
Certainly has a lot of appeal and beats Slocum's carpet tacks.
The attempted intruder also acts as his own alarm as the YELP should
be able to be heard for some distance. (judging from my own first
encounter with an electric fence..."Now how bad can this be?")

Kiyu



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Thanks - something like the DSC Force 2 dual detector should be OK

http://www.dscsec.com/nwforce2.htm



On Thu, 13 Nov 2003 17:11:05 -0700, "JG AJ"
wrote:

You would want door contacts for the doors of course. I would recommend
dual-tech motion detectors if you are going to use them to keep false alarms
down. The IR has to be set off as well as the micro wave for it go in to
alarm. This means that light or heat that would set off the infra red would
not set off the microwave. A bird that would set off the microwave (
Motion) would not set off the infra red but a human walking would wet off
the infra red heat and the micro wave motion. I would also recommend going
wireless to keep from having to run wires and it would be easier to move the
sensors later if wanted. The alarm system can be connected to the dock
phone line to dial out to where ever you want or it can be local on the boat
only and sound an alarm there.

There are many possibilities of ways to do this. I would start with what
you want the end result to be and design backward. It is easy to do.

John Mears
"Panama" wrote in message
.. .
I'm looking for design ideas and components for an intrusion alarm for
the boat. A friend bought 2 IR xmit and 2 IR receiver units to mount
in the cockpit, but my thought is that irregular sunlight bouncing off
waves, etc is going to set this arrangement off.

Thanks - something like the DSC Force 2 dual detector should be OK

http://www.dscsec.com/nwforce2.htm



On Thu, 13 Nov 2003 17:11:05 -0700, "JG AJ"
wrote:

You would want door contacts for the doors of course. I would recommend
dual-tech motion detectors if you are going to use them to keep false alarms
down. The IR has to be set off as well as the micro wave for it go in to
alarm. This means that light or heat that would set off the infra red would
not set off the microwave. A bird that would set off the microwave (
Motion) would not set off the infra red but a human walking would wet off
the infra red heat and the micro wave motion. I would also recommend going
wireless to keep from having to run wires and it would be easier to move the
sensors later if wanted. The alarm system can be connected to the dock
phone line to dial out to where ever you want or it can be local on the boat
only and sound an alarm there.

There are many possibilities of ways to do this. I would start with what
you want the end result to be and design backward. It is easy to do.

John Mears
"Panama" wrote in message
.. .
I'm looking for design ideas and components for an intrusion alarm for
the boat. A friend bought 2 IR xmit and 2 IR receiver units to mount
in the cockpit, but my thought is that irregular sunlight bouncing off
waves, etc is going to set this arrangement off.

The problem that I see with the "electric fencer" idea is that on
fiberglass boats there is no ground return path. Having installed
a few electric fencers in the past, I can tell you that normally the
fencer ground is connected to a metal stake driven deep into the
earth. Then when someone touches the wire of the fence, the dirt
they are standing on makes the return path. I'm not sure that fiberglass
would conduct enough for someone standing on the deck to get much of
a shock from touching an energized railing. It might.

Now on a steel, or aluminum boat... ;-) Of course, you would then have
to electrically insulate the railings from the rest of the boat. And that
fencer is going to really annoy your neighbors whenever someone trys
to use the radio.

Later,

Don W.



Kiyu wrote:
On Sun, 9 Nov 2003 20:08:43 -0700, "Bob La Londe"
wrote:


There are a couple guys who hang out in news:alt.security.alarms who have
done some really comprehensive boat alarms including monitoring using
cellular communications designed for alarm purposes.

Obviously communications may not work when off the coast of some desert
island in the middle of nowhere, but it works well when at your home
anchorage.


Although this isn't an alarm as such, more along the lines of
intrusion prevention for foreign anchorages, while doing a Google
search the other day I found where someone sells an electric fence
charger/energizer for boat railings. With a bit of imagination I would
think satisfactory electrical return paths could be worked out to
allow use of a standard cattle unit.
Certainly has a lot of appeal and beats Slocum's carpet tacks.
The attempted intruder also acts as his own alarm as the YELP should
be able to be heard for some distance. (judging from my own first
encounter with an electric fence..."Now how bad can this be?")

Kiyu



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The problem that I see with the "electric fencer" idea is that on
fiberglass boats there is no ground return path. Having installed
a few electric fencers in the past, I can tell you that normally the
fencer ground is connected to a metal stake driven deep into the
earth. Then when someone touches the wire of the fence, the dirt
they are standing on makes the return path. I'm not sure that fiberglass
would conduct enough for someone standing on the deck to get much of
a shock from touching an energized railing. It might.

Now on a steel, or aluminum boat... ;-) Of course, you would then have
to electrically insulate the railings from the rest of the boat. And that
fencer is going to really annoy your neighbors whenever someone trys
to use the radio.

Later,

Don W.



Kiyu wrote:
On Sun, 9 Nov 2003 20:08:43 -0700, "Bob La Londe"
wrote:


There are a couple guys who hang out in news:alt.security.alarms who have
done some really comprehensive boat alarms including monitoring using
cellular communications designed for alarm purposes.

Obviously communications may not work when off the coast of some desert
island in the middle of nowhere, but it works well when at your home
anchorage.


Although this isn't an alarm as such, more along the lines of
intrusion prevention for foreign anchorages, while doing a Google
search the other day I found where someone sells an electric fence
charger/energizer for boat railings. With a bit of imagination I would
think satisfactory electrical return paths could be worked out to
allow use of a standard cattle unit.
Certainly has a lot of appeal and beats Slocum's carpet tacks.
The attempted intruder also acts as his own alarm as the YELP should
be able to be heard for some distance. (judging from my own first
encounter with an electric fence..."Now how bad can this be?")

Kiyu



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I've done a few alarm systems in funny places; I found that the worst thing
is false alarms, so now I use only simple and reliable switches, i.e. light
beams and magnetic switches [no motion detectors].
but the thing I really like is the paging system with it's own transmitter
[CB frequency]. works for about a half a mile. get it form auto radio and CB
kind of shops.
then you have the option for a silent alarm. we caught a guy with ours some
years ago [there was some violence, noise, and then a three year prison term
for him].
while sleeping on board, nothing beats a dog. a funny smell in your space
rings in a canine head like a siren. my fuzzy little friends have saved us
at least 4 times in the last 15 years.
regards, Mark Holden


"Kiyu" wrote in message
...
On Sun, 9 Nov 2003 20:08:43 -0700, "Bob La Londe"
wrote:

There are a couple guys who hang out in news:alt.security.alarms who have
done some really comprehensive boat alarms including monitoring using
cellular communications designed for alarm purposes.

Obviously communications may not work when off the coast of some desert
island in the middle of nowhere, but it works well when at your home
anchorage.

Although this isn't an alarm as such, more along the lines of
intrusion prevention for foreign anchorages, while doing a Google
search the other day I found where someone sells an electric fence
charger/energizer for boat railings. With a bit of imagination I would
think satisfactory electrical return paths could be worked out to
allow use of a standard cattle unit.
Certainly has a lot of appeal and beats Slocum's carpet tacks.
The attempted intruder also acts as his own alarm as the YELP should
be able to be heard for some distance. (judging from my own first
encounter with an electric fence..."Now how bad can this be?")

Kiyu



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