Re: diy microwave alarm

[joe hey <joehey@xxxxxxxxxxxxxx>]

On Tue, 29 Apr 2014 20:29:26 -0700, Jim wrote:

> On Tuesday, April 29, 2014 9:00:41 PM UTC-4, joe hey wrote:
>> Hi, I was wondering if there are any (I didn't find any using google)
>> do
>>
>> it yourself descriptions for a microwave perimeter intrusion detector/
>>
>> alarm?
>>
>>
>>
>> From the pictures I've seen of opened up ones, the antennas used seem
>>
>> pretty simple. Electronincs shouldn't be too hard either.
>>
>>
>>
>> Application is for protecting an agricultural area of about 3 ha, bound
>>
>> by 6 straight lines and corners.
>>
>>
>>
>> Has anyone ever come across some useful links?
>>
>>
>>
>> Would be very helpful,
>>
>> thanks
>
> Haven't seen any DIY but before you try to re-invent the wheel you might
> want to consider how you are going to design a microwave perimeter
> intrusion detector that will ignore bugs, birds, animals, blowing
> leaves, snow, and plants moving in the wind.

It is explicitly *not* my intention to re-invent 'the wheel'. That's why
I'm asking for links to successful (hence useful) diy projects, i.e.:
projects that are completed and available for copying.

Re other-than-human objects: I think those absorb a lot less energy than
humans, except for cows and the likes of course. But then, who wants a
cow in his strawberry field?

> Also, when fooling around with microwave emitters ..... "you can put
> your eye out".

Yes.

Thank you for your thoughts,

joe