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MURS for Security?

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MikeMartin:
Jack talks about this on the show but I would like to know more.  So as I understand it I can buy some "sensors" and put them out on my property and they relay alerts of motion detection.  My questions

1.  How sensitive are they can I adjust it up or down.  I don't want blowing leaves setting it off all the time.

2.  What is the range?  Not back to the radio but how far from the sensor do they detect motion and what is the "cone" of detection and is.  What I mean is can I like set it for a wide or narrow area?

3.  How many sensors can I have on one property?  With out getting fancy anyway?

Mike

rob_ma:

--- Quote from: MikeMartin on November 17, 2009, 09:58:52 AM ---Jack talks about this on the show but I would like to know more.  So as I understand it I can buy some "sensors" and put them out on my property and they relay alerts of motion detection.  My questions
--- End quote ---

Hi Mike,



--- Quote from: MikeMartin on November 17, 2009, 09:58:52 AM ---1.  How sensitive are they can I adjust it up or down.  I don't want blowing leaves setting it off all the time.
--- End quote ---

There are two different security sensors:

1) MURS Alert Transmitter (MAT) uses infrared to detect the movement of warm objects - human, animal, vehicles, etc.

2) MURS Alert Probe Sensor (MAPS) uses a small probe with a 50 foot cable that can be buried to detect vehicle only traffic. (large metal object)

Both sensors have a sensitivity adjustment that will control how small of a change will be detected. Weather related movement is usually not detected by the MAT unit unless it is severe.




--- Quote from: MikeMartin on November 17, 2009, 09:58:52 AM ---2.  What is the range?  Not back to the radio but how far from the sensor do they detect motion and what is the "cone" of detection and is.  What I mean is can I like set it for a wide or narrow area?
--- End quote ---

The MAT manual states ranges up to 80 feet. My personal experience is that at 30-50 feet you will have optimum detection. The detection area is cone shaped. There isn't a setting to narrow the range but a simple and effective way to do that is to add some electrical tape to the detector port on the front of the unit. This will create a smaller slit and will reduce the width of the cone. For optimal results the MATs will work best if there is a somewhat stationary object (building, woods/brush, etc.) across from it so that it has a constant "background" to detect change in temperature and motion.

Online Manual:
<http://www.dakotaalert.com/manuals/Murs-Alert.pdf>


--- Quote from: MikeMartin on November 17, 2009, 09:58:52 AM ---3.  How many sensors can I have on one property?  With out getting fancy anyway?
--- End quote ---

The motion sensors (both) have four unique alert messages (Alert Zone One, Two, Three and Four). When received by either the hand held or base this will identify the exact detector being set off. Many of my customers have added more than four detectors and set up regions. By duplicating the alert message on more then one detector you can create alerts based on areas or regions of your property.

For example, one customer had a long dirt road that went past his house. He set up regional detectors with duplicate alert messages on the road so he knew someone on the road, then had more the specific detectors closer to the house.


I hope that answers your questions. Please let me know if you have more.

- Rob

selfsufficient:
Hi there could you explain further how your customers established more than four sensors. How can you distinquish clearly between set up zones or regions?? For example if I had five sheds on my farm how could I Distinquish the 5th shed, or Additionally a road?.
Also how can the portables be charged in a foreign country that uses 240Vac. what voltage does the transformer pack output have to be??

Thanking you

rob_ma:

--- Quote from: selfsufficient on December 27, 2009, 03:41:26 PM ---Hi there could you explain further how your customers established more than four sensors. How can you distinquish clearly between set up zones or regions?? For example if I had five sheds on my farm how could I Distinquish the 5th shed, or Additionally a road?.
--- End quote ---

Short answer... you can't distinguish more than 4 sensors if you need to distinctly identify the specific detector.

If you can utilize a regional approach then here are some more specifics:

Since there are only four alert messages you would need to duplicate the message on two units. Here is an example:

Shed #1 - "alert zone 1"
Shed #2 - "alert zone 2"
Shed #3 - "alert zone 3"
Shed #4 - "alert zone 4"

The fifth shed, since it is hypothetically near shed #4, would have a the same alert message (alert zone 4) as shed #4. Since you won't be able to uniquely identify the actual shed when you hear alert zone 4, you would know the general area that was tripped.

So, if you need to identify which shed's detector was tripped, you would be limited to 4 sensors. If you were OK with the general region that was tripped then you could add more than 4 sensors.






--- Quote from: selfsufficient on December 27, 2009, 03:41:26 PM ---Also how can the portables be charged in a foreign country that uses 240Vac. what voltage does the transformer pack output have to be??

Thanking you

--- End quote ---


The wall mount power supplies, whether you are referring to the base power supply or the hand held charger, operate on 120 VAC. The output of the base supply is 12 VDC so you could easily convert the base to operate on a battery bank if you use solar, wind, etc (or even vehicular use). You would use the voltage adapters sold at Radio Shack to convert them to 240 VAC if desired.

One caveat, while some countries are lax in their enforcement of unlicensed radio operation, the US is the only country I am aware of that allows for unlicensed operation on MURS frequencies. In other countries those frequencies may be used by the local police or other agencies and they would not be pleased if they were interfered with. One of my customers in Argentina noted that there were two frequencies that these units used that were used by the local police there.

- Rob

longhaul:
Has anyone found a way to communicate sound from one building to another: e.g. a smoke detector goes off in the barn and you hear it while sleeping in the house?  A baby monitor could do this, but a way to integrate with the MURS setup or similar seems better...

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