> I have need for a burgler alarm that needs to have a range of 22 miles

> embedded cell phone does us no good.

> The thieves know that they can cut the phone line

> but the internet goes down so often for short periods of time.

> I do have a ham license, so an HF transmitter might be an option.

- 22 miles sounds specific. If you have a fixed location in mind then
a fixed link is worth considering.
Depending on terrain  you can do this with WiFi with  1 or a few hops
and varying legality.

- Ham RF link sounds easy and eminently doable.

- Shortish distance WiFi links to other houses etc with internet
connectivity and hopefully a different network etc may provide
security from diversity.

- Hidden cameras can be cheap and hard to find. Using a logging
multichannel recorder hidden somewhere unfindable gives a record. Use
of a short range WiFi link for this to a neighbour would be easyish.

- Signs proclaiming hidden cameras and radio links may be a deterrent or a spur.

- WiFi link to a location with cellphone coverage may be an easy solution.

- Distances of km can be obtained with modest parabolas and semi
serious one - 1 to 2 metre diameter can give great range.

- Rottweiller, Doberman, Alsatian, Chihuahua, ...

- Bren, Sten, Claymore, Semtex, ..

- ED-209 **

- HV, EHT, ...

- Capsicum powder dispersal on alarm triggering.

- CN, NH4OH*, ...

- VERY VERY VERY loud alarms are sometimes intentionally used for area denial.

...

* would probably work a treat for area denial.



            R
** Probably available cheap.
http://en.wikipedia.org/wiki/ED-209
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist