Guy builds a portable autonomous sentry

[PowerGloveClock]

What if I told you the projects were connected.

then I'd ask how

[Blue]

then I'd ask how

Well, ok they aren't THAT connected... But I will need an internet connection to continue my work in the near future.

[PowerGloveClock]

Well, ok they aren't THAT connected... But I will need an internet connection to continue my work in the near future.

then stop lieing to me

[Solenoidclock]

You are aware that the curvature of the earth is going to limit your range, right? It managed to interfere with the Defcon Wireless shootout to the point that some of the contestants needed scaffolding and fiberglass poles just to maintain line of sight. These were unamplified, even!

  How much power does your transmitter pack? Will the FCC classify it as point-to-point? Will you be bouncing  off of the ionosphere? How would that scan? Which frequencies? Can it nuke birds?

[Blue]

You are aware that the curvature of the earth is going to limit your range, right? It managed to interfere with the Defcon Wireless shootout to the point that some of the contestants needed scaffolding and fiberglass poles just to maintain line of sight. These were unamplified, even!

  How much power does your transmitter pack?

The whole system will require 115 volt, or a car battery... I'm not making this to be portable to the extent of self-powered use. Part of this is because I'm using antenna rotators, and they are big and beafy enough to rotate much heavier antennas than the one I'm using. I may switch out the 19 dBi flat pannel for a parabolic 24.5 dBi if I want to go for some kind of record later. But for now, the flat-pannel is very convenient because of it's size (15" x 15" x 2").

Will the FCC classify it as point-to-point?

I imagine since it is highly directional that it would be considered point-to-point, but that doesn't matter, since the FCC limit for point-to-point is 4 EIRP with a 6 dBi antenna, and by my best guess I'm putting out roughly 63 EIRP with a 19 dBi antenna. I can lower the Tx output of my adapter via software, but I'm not sure how much to reduce it yet.

Will you be bouncing  off of the ionosphere?

I highly doubt that.

How would that scan?

I will have to make some software to integrate with existing network discovery software. Essentially the system will rotate, and tilt, storing the signal strengths based on degrees of both, thereby giving rough estimations of the directions of the incoming signals and/or surfaces that are bouncing those signals. I'll be starting with XP, cause I know it better, then I'll see if I can get the code to work in Backtrack 3. Right now I'm trying to figure out the best approach for connecting the laptop to the antenna rotators. I was going to just use some IR blasters, but that wouldn't be quite sensitive enough so I'll probably just get a usb relay card.

Which frequencies? Can it nuke birds?

2.4Ghz only. But it can later be adapted for 5Ghz as the technology becomes more common. No, it can't nuke birds. The radiation it emits is still far less than the radiation that leaks out of a broken microwaves. Still, according to health regulations, I shouldn't point it at anybody, and should be several feet away if using it for extended periods of time. Once in place it can be controlled remotely via secondary built-in access point (wired or wireless).


Just got the antenna rotators today, so now I just need the water-tight case and my heatsinks and I can begin construction... I'll leave calibration and software for last, since that will depend heavily on how the thing is built.

[Bigglesnoots]

a car battery...

car batteries are 12V here I think.

amazing

[Slurpee]

It's a simple matter to have it say "Are you still there?"

"Don't shoot! It's me!"


"Ow ow ow ow ow ow ow!"





"... I don't hate you."











=(

[Bigglesnoots]

It's a simple matter to have it say "Are you still there?"

"... nooo "

[Blue]

car batteries are 12V here I think.

amazing

I said "or" because it can also use a power inverter and thus run off of a car battery.