Parabolic antennae/USB sharing (Slow for dial-up)

Psychobiker · 10-06-2005

Hi,

I went out and purchased a wok....12". Nice, robust thing. Now, the question is - when making a parabolic antenna, does it matter if the rear plane is flat, as most woks will be? I've calculated the focus to be exactly 70mm out and about 15dB gain speculated...

And second question - USB is no problem with long runs etc, but can you share one computer's USB connection to the AP in my other house (ie. usb parabola -> AP in my other place) via ethernet? I assume so, as Windows (pretty much) has the option to do something very similar. Just wondering if anyone else has done similar?

L

streaker69 · 10-06-2005

Quote:

Originally Posted by Psychobiker

Hi,

I went out and purchased a wok....12". Nice, robust thing. Now, the question is - when making a parabolic antenna, does it matter if the rear plane is flat, as most woks will be? I've calculated the focus to be exactly 70mm out and about 15dB gain speculated...

And second question - USB is no problem with long runs etc, but can you share one computer's USB connection to the AP in my other house (ie. usb parabola -> AP in my other place) via ethernet? I assume so, as Windows (pretty much) has the option to do something very similar. Just wondering if anyone else has done similar?

L

Look up Windows ICS. That should do what you ask.

Psychobiker · 10-06-2005

Done, ta, I thought as much.

Re the parabola...is that feasable if the back is flat a little?

L

Scruge · 10-06-2005

Quote:

Originally Posted by Psychobiker

Done, ta, I thought as much.

Re the parabola...is that feasable if the back is flat a little?

L

You can get away with a flat spot. The main thing is to make sure the wok is a parabola. Most of the ones I've checked aren't.

Take a length of pvc pipe and stand it up in the center of the wok. Then shine a bright light or laser pointer into the wok. You should see a concentration of light project onto the pipe. The laser pointer has the advantage of finding irregularities in the wok.

Psychobiker · 10-06-2005

Eek, I dont; have one. I know where to get parabolic cake covers

and I have two parabolic sieves.....

Can we make an exception for 15kB....if I make it any smaller the mesh will go ape on screen?

Psychobiker · 10-06-2005

Wok....netwokking?!

Scruge · 10-06-2005

Quote:

Originally Posted by Psychobiker

Eek, I dont; have one. I know where to get parabolic cake covers

and I have two parabolic sieves.....

Can we make an exception for 15kB....if I make it any smaller the mesh will go ape on screen?

Just resize pics to smaller dimensions.

If you don't have pvc use a spent roll of paper towels or a ruler or yard stick, just something light colored to see the focus point.

That wok is a lot flatter than I thought.

Psychobiker · 10-06-2005

Quote:

Originally Posted by Scruge

Just resize pics to smaller dimensions.

If you don't have pvc use a spent roll of paper towels or a ruler or yard stick, just something light colored to see the focus point.

That wok is a lot flatter than I thought.

If it focuses..all is good

Thorn · 10-06-2005

Excemption asked for and granted.

Scruge · 10-06-2005

Quote:

Originally Posted by Psychobiker

If it focuses..all is good

Yep, but more than likely you'll get a couple of focus points or large diffused points. Use the one with the most intense spot of light. Gain will be a function of the area of the utensil producing the spot.

Psychobiker · 10-06-2005

http://www.usbwifi.orcon.net.nz/wokaxim.jpg

that's not ENTIRELY curved either....

Psychobiker · 10-06-2005

ok, doing the light thing, I got a focus at about 75mm out.

But seeing as that antenna will broadcast it's whole length, surely one way or another it'll be concentrated onto some part of the aerial?

Psychobiker · 10-06-2005

failing the wok working, I have an elliptical cake cover...but this has two focii and would be more fuss than it's worth?
best to go with the sieves?

L

10-06-2005	#1 (permalink)
Psychobiker Registered Member Join Date: Oct 2005 Posts: 58	Parabolic antennae/USB sharing (Slow for dial-up) Hi, I went out and purchased a wok....12". Nice, robust thing. Now, the question is - when making a parabolic antenna, does it matter if the rear plane is flat, as most woks will be? I've calculated the focus to be exactly 70mm out and about 15dB gain speculated... And second question - USB is no problem with long runs etc, but can you share one computer's USB connection to the AP in my other house (ie. usb parabola -> AP in my other place) via ethernet? I assume so, as Windows (pretty much) has the option to do something very similar. Just wondering if anyone else has done similar? L

10-06-2005	#9 (permalink)
Thorn Did you do the math? Join Date: Apr 2002 Location: Villa Straylight Posts: 10,361	Excemption asked for and granted. __________________ Thorn "Read Altas Shrugged. Compare it to today. Repeat as necessary"

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10-06-2005	#3 (permalink)
Psychobiker Registered Member Join Date: Oct 2005 Posts: 58	Done, ta, I thought as much. Re the parabola...is that feasable if the back is flat a little? L

10-06-2005	#11 (permalink)
Psychobiker Registered Member Join Date: Oct 2005 Posts: 58	http://www.usbwifi.orcon.net.nz/wokaxim.jpg that's not ENTIRELY curved either....

10-06-2005	#12 (permalink)
Psychobiker Registered Member Join Date: Oct 2005 Posts: 58	ok, doing the light thing, I got a focus at about 75mm out. But seeing as that antenna will broadcast it's whole length, surely one way or another it'll be concentrated onto some part of the aerial?

10-06-2005	#13 (permalink)
Psychobiker Registered Member Join Date: Oct 2005 Posts: 58	failing the wok working, I have an elliptical cake cover...but this has two focii and would be more fuss than it's worth? best to go with the sieves? L