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09-21-2002
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#2 (permalink) |
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Master of the universe
Join Date: Jun 2002
Location: chicago
Posts: 658
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i dont know what the rules are on picture dimensions so i will just post links
http://www.redlinechicago.com/images/rig.jpg http://www.redlinechicago.com/images/antenna.jpg http://www.redlinechicago.com/images/withoutant.jpg http://www.redlinechicago.com/images/withant.jpg thankyou i posted this for those of you who have some copper coil lying around and wanted to build as close to a free antenna as possible  i hope one of you will build one and post your results
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SO SAYS TheSovereign |
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09-21-2002
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#3 (permalink) |
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SSID=Wardriver
Join Date: May 2002
Location: Dallas
Posts: 79
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Humm could you give some demensions/coils etc?
Also it seams as though this is a bidirectional antenna? Can't see how this could be an omni. Also could you take some pics of the signal strength graphs its very difficult to make out the gain. |
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09-21-2002
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#4 (permalink) |
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Stumbling on
Join Date: Aug 2002
Location: Houston,TX
Posts: 47
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When I look at the "coil antenna" I am a bit astonished.... The amount of turns in those coils is quite big for 2.4GHz. In addition the wire to "ground" side of N connector has another extra loop, which (in addition to the remarkably long wire) represent an active part of this antenna system.
But if it works, it is obviously useful antenna. On the other hand, I am a bit skeptical regarding reproducibility because likely too many hard to control parameters affect the function. Therefore the functionality is very likely dependent on secondary and tertiary parameters, making this design tough to reliably produce, simulate or calculate. (stray capacitances, wire diameter, thickness of enamel on the wire, layout of interconnects etc. Also gap between windings seems to be very small and hard to control...) Therefore, I have a gut feeling that this very interesting construction will work differently in every incarnation -- sometimes well, sometimes not. Would be indeed interesting to see the radiation pattern of this antenna. It could be anything (but not symmetrical omni).
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"They that give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin, 1759 |
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09-21-2002
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#5 (permalink) |
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Master of the universe
Join Date: Jun 2002
Location: chicago
Posts: 658
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the motor coil i use is gauge 14
wrap in alternating patterns of 25 and 28 coils on a 1/8 inch drill bit the coils are to be 1.75 inches apart that extra loop is there cuz i was too lazy to cut off the extra coil i produced 5 of them and got those results a reliable freind of mine recommended to me this antenna i produced one with 2 coils and was impressed so i made one with 5 coils lincomatic also produces this antenna but didnt have as much luck you can doubt all you want the proof is in the pictures yes its directional so far as i can tell the radiation pattern is at its max head on and behind the signal almost completely disappears when the signal point is perpendicular then comes back full as u leave it i want i can post the full 1600x1200 pics so u can see better ill start taking some sc's of my gains and posting them my freind with the access is out of town at a lan party so i cant test with his ap
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SO SAYS TheSovereign Last edited by TheSovereign : 09-21-2002 at 10:07 PM. |
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09-22-2002
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#6 (permalink) | |
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Tropical Stumbler
Join Date: Apr 2002
Posts: 575
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Quote:
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09-22-2002
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#7 (permalink) |
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Hiptop Stumbler
Join Date: May 2002
Location: San Jose, CA
Posts: 59
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X22
TheSovereign's "S-shaped" antenna design is used as one of the many industry standards. On the IBM X22 Ultraportable laptops, the integrated wireless card's antenna is S-shaped inside of the monitor. This is much more diverse than the generic PCMCIA Orinoco-type design.
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09-23-2002
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#10 (permalink) |
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Master of the universe
Join Date: Jun 2002
Location: chicago
Posts: 658
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i already added and removed the antenna before i took the images
so those have already peaked or whatever try it with yours once those hit their peaks they dont move anymore would u like me to take some video or would u be skeptical at that as well?
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SO SAYS TheSovereign Last edited by TheSovereign : 09-23-2002 at 02:58 PM. |
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09-23-2002
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#11 (permalink) |
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Registered Member
Join Date: May 2002
Location: CT
Posts: 476
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How about a text export of the relevant seconds? I'm just saying that the picture doesn't show what you're saying (that there's 20 dB gain). In other words I want to see how the signal and noise change as well as the SNR.
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09-23-2002
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#13 (permalink) |
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Master of the universe
Join Date: Jun 2002
Location: chicago
Posts: 658
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here u go i did it
finally figured out how it worked lol http://www.redlinechicago.com/images/export.txt i plugged and unplugged it a couple of times to show diffrence kinda hard to do it with the AP owner sitting on his front stoop LOL
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SO SAYS TheSovereign Last edited by TheSovereign : 09-23-2002 at 07:38 PM. |
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09-23-2002
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#14 (permalink) | |
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Tropical Stumbler
Join Date: Apr 2002
Posts: 575
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Quote:
Channel, Vendor, Type, WEP, SNR, Signal+, Noise- not displayed are - to the left of the pic - MAC & SSID - to the right of the pic - SNR+, Latitude, Longitude, First Seen, Last Seen, Signal, Noise, Flags & Beacon Interval I'm only going to define the relevant fields SNR displays the current signal to noise ratio for the AP SNR+ displays the highest signal to noise ratio recorded for the AP Signal displays the current signal level for the AP Signal+ displays the strongest signal recorded for the AP Noise displays the current noise level for the AP Noise- displays the lowest noise level recorded for the AP So what you're actually looking at in these pics are the current SNR along with the strongest signal & lowest noise levels recorded for the AP, with & without the antenna. If the display fields were compressed to hide the unnecessary* fields you would be able to see the current SNR, signal & noise levels. * these would be Signal+, Noise-, SNR+, First Seen & Last Seen Last edited by fordem : 09-23-2002 at 07:14 PM. |
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