Ok guys...this is a difficul experience to break ;9 now it would be easy if the alarm ERS was outside the door...but its not, of course, as you see in the picture the sensors, are both cover on the door, as well as on the elctronic board where you see the LED's sensors. I took this part of the article, because the guy is talking about satelites and radars, but then this what we need "hen using the HB100 for “movement sensor” applications, the output just goes to an appropriate frequency filter for the range of movement you’re looking for (like a person walking) and that can flip a light switch or open an automatic door
Now, most mixers are imperfect, which means we’ll still have a good amount of the original 10Ghz signals in there too… but since we’re really only interested in the low-end frequencies coming out of the mixer, we can just scythe off everything above a few hundred kilohertz (by using NON-microwave-rated components like common audio amplifiers) and all we’re left with is the ‘doppler’ signal we wanted.
Since low-frequency signals are much easier to preserve and amplify than RF and the frequency difference so great, in practice that means we can hear very faint Doppler signals next to our relatively powerful carrier signal. Even with a really sloppy filter.
It’s also the case that the exact emitted frequency can drift quite a bit and yet the mixer results barely change, making the modules immune to most temperature and power supply variations.
However, the HB100 isn’t immune to 5v on the IF pin, I discovered. That will kill it dead and trip your DC supply protection to boot. Which is the perfect time to tear something apart!"
difficult breaking high security costs money, you need this which divided for 4 of us...its out of my range right now, costs 238$
interfometer mirror : http://www.ebay.com/itm/HP-Hewlett-Packard-Agilent-10557A-Interferometer-Turning-Mirror-Excellent/322465752053?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D41375%26meid%3D236ea03726fa4d3f8aec4f96dcccac64%26pid%3D100005%26rk%3D3%26rkt%3D6%26sd%3D132140579954&_trksid=p2047675.c100005.m1851
Now, most mixers are imperfect, which means we’ll still have a good amount of the original 10Ghz signals in there too… but since we’re really only interested in the low-end frequencies coming out of the mixer, we can just scythe off everything above a few hundred kilohertz (by using NON-microwave-rated components like common audio amplifiers) and all we’re left with is the ‘doppler’ signal we wanted.
Since low-frequency signals are much easier to preserve and amplify than RF and the frequency difference so great, in practice that means we can hear very faint Doppler signals next to our relatively powerful carrier signal. Even with a really sloppy filter.
It’s also the case that the exact emitted frequency can drift quite a bit and yet the mixer results barely change, making the modules immune to most temperature and power supply variations.
However, the HB100 isn’t immune to 5v on the IF pin, I discovered. That will kill it dead and trip your DC supply protection to boot. Which is the perfect time to tear something apart!"
interfometer mirror : http://www.ebay.com/itm/HP-Hewlett-Packard-Agilent-10557A-Interferometer-Turning-Mirror-Excellent/322465752053?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D41375%26meid%3D236ea03726fa4d3f8aec4f96dcccac64%26pid%3D100005%26rk%3D3%26rkt%3D6%26sd%3D132140579954&_trksid=p2047675.c100005.m1851
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