From: Steve B. <st...@i-...> - 2011-01-23 20:40:46
|
I'm currently working on a project using the onboard wifi (fire-summit) to transmit runtime data and images to a remote PC in a time critical application - still in the early planning stages. however, I'm curious on what "acceptable" ranges people are getting with the supplied u.fl antennas under normal circumstances. I'm contemplating using a u.fl to rev sma connector to fit a bigger antenna: has anyone tried to do this, and was it worth it/did it work? for reference i'm looking at pairing this: http://www.amazon.co.uk/inches-U-FL-pigtail-RP-SMA-female-connector/dp/B003S03DGM/ref=pd_sim_ce_6 ... with a 9dbi aerial on the overo side of things. at the PC end i'm looking at a 2W generic USB transmitter, also with 9dbi aerial(s) to bump-up the range. i'm not too sure how "good" the onboard wifi is strength-wise (generally i dont use wifi), hence looking for any advice on this one. range-wise, i'm looking at achieving clear line-of-sight of atleast 1500m distance, with as low signal attenuation as possible (allowing for much larger ranges to be attainable in the future). Steve -- View this message in context: http://old.nabble.com/overo-wifi-strength-with-different-antenna%3A-query-tp30743799p30743799.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: Cole C. <col...@gm...> - 2011-01-24 08:24:00
|
Steve, To put it bluntly, what you want to do is a public nuisance and most likely illegal. If you typed correctly, you want a 1.5 km link or more which is 10x the normal maximum range of WiFi devices. Before you begin make sure you understand your local laws, do a detailed link budget, and consider those around you who want to use their wireless in it's legal, intended fashion. On Sun, Jan 23, 2011 at 2:40 PM, Steve Birch <st...@i-...> wrote: > > I'm currently working on a project using the onboard wifi (fire-summit) to > transmit runtime data and images to a remote PC in a time critical > application - still in the early planning stages. however, I'm curious on > what "acceptable" ranges people are getting with the supplied u.fl antennas > under normal circumstances. I'm contemplating using a u.fl to rev sma > connector to fit a bigger antenna: has anyone tried to do this, and was it > worth it/did it work? > > for reference i'm looking at pairing this: > > http://www.amazon.co.uk/inches-U-FL-pigtail-RP-SMA-female-connector/dp/B003S03DGM/ref=pd_sim_ce_6 > ... with a 9dbi aerial on the overo side of things. at the PC end i'm > looking at a 2W generic USB transmitter, also with 9dbi aerial(s) to > bump-up > the range. > > i'm not too sure how "good" the onboard wifi is strength-wise (generally i > dont use wifi), hence looking for any advice on this one. range-wise, i'm > looking at achieving clear line-of-sight of atleast 1500m distance, with as > low signal attenuation as possible (allowing for much larger ranges to be > attainable in the future). > > Steve > -- > View this message in context: > http://old.nabble.com/overo-wifi-strength-with-different-antenna%3A-query-tp30743799p30743799.html > Sent from the Gumstix mailing list archive at Nabble.com. > > > > ------------------------------------------------------------------------------ > Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! > Finally, a world-class log management solution at an even better > price-free! > Download using promo code Free_Logger_4_Dev2Dev. Offer expires > February 28th, so secure your free ArcSight Logger TODAY! > http://p.sf.net/sfu/arcsight-sfd2d > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Bob C. <bco...@ve...> - 2011-01-25 00:56:42
|
I think there is a good possibility that Steve can make use of wifi repeater stations, if any are in his community. I think it is fairly common to have such repeaters. 1.5 km is not an impressive distance. You can repeat a wifi signal over longer distances. There are billions, perhaps trillions, of radio devices around us in today's world: I can't see a 9 Dbi antenna (which doesn't require a license) hurting anyone as long as he doesn't cause interference. Thanks Bob Cochran On 01/24/2011 03:23 AM, Cole Christensen wrote: > Steve, > > To put it bluntly, what you want to do is a public nuisance and most > likely illegal. > > If you typed correctly, you want a 1.5 km link or more which is 10x > the normal maximum range of WiFi devices. > > Before you begin make sure you understand your local laws, do a > detailed link budget, and consider those around you who want to use > their wireless in it's legal, intended fashion. > > On Sun, Jan 23, 2011 at 2:40 PM, Steve Birch <st...@i-... > <mailto:st...@i-...>> wrote: > > > I'm currently working on a project using the onboard wifi > (fire-summit) to > transmit runtime data and images to a remote PC in a time critical > application - still in the early planning stages. however, I'm > curious on > what "acceptable" ranges people are getting with the supplied u.fl > antennas > under normal circumstances. I'm contemplating using a u.fl to rev sma > connector to fit a bigger antenna: has anyone tried to do this, > and was it > worth it/did it work? > > for reference i'm looking at pairing this: > http://www.amazon.co.uk/inches-U-FL-pigtail-RP-SMA-female-connector/dp/B003S03DGM/ref=pd_sim_ce_6 > ... with a 9dbi aerial on the overo side of things. at the PC end i'm > looking at a 2W generic USB transmitter, also with 9dbi aerial(s) > to bump-up > the range. > > i'm not too sure how "good" the onboard wifi is strength-wise > (generally i > dont use wifi), hence looking for any advice on this one. > range-wise, i'm > looking at achieving clear line-of-sight of atleast 1500m > distance, with as > low signal attenuation as possible (allowing for much larger > ranges to be > attainable in the future). > > Steve > -- > View this message in context: > http://old.nabble.com/overo-wifi-strength-with-different-antenna%3A-query-tp30743799p30743799.html > Sent from the Gumstix mailing list archive at Nabble.com. > > > ------------------------------------------------------------------------------ > Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! > Finally, a world-class log management solution at an even better > price-free! > Download using promo code Free_Logger_4_Dev2Dev. Offer expires > February 28th, so secure your free ArcSight Logger TODAY! > http://p.sf.net/sfu/arcsight-sfd2d > _______________________________________________ > gumstix-users mailing list > gum...@li... > <mailto:gum...@li...> > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > ------------------------------------------------------------------------------ > Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! > Finally, a world-class log management solution at an even better price-free! > Download using promo code Free_Logger_4_Dev2Dev. Offer expires > February 28th, so secure your free ArcSight Logger TODAY! > http://p.sf.net/sfu/arcsight-sfd2d > > > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: J. L. <vwy...@gm...> - 2011-01-25 22:27:45
|
I have used a 15dbi patch antenna on my overo and had decent results for distance. Though the on board wifi I find to not be that great of a device and there has been numerous continuing issues with the on board wifi that you can find in the boards if you search. I use Alfa adapters now on my over and still run the patch.. I dont see how a 9dbi ant of any type would be illegal especially in the US since you can walk into a wal mart and buy a more powerful antennae than a 9dbi you screw on On Mon, Jan 24, 2011 at 4:56 PM, Bob Cochran <bco...@ve...> wrote: > I think there is a good possibility that Steve can make use of wifi > repeater stations, if any are in his community. I think it is fairly > common to have such repeaters. 1.5 km is not an impressive distance. You > can repeat a wifi signal over longer distances. > > There are billions, perhaps trillions, of radio devices around us in > today's world: I can't see a 9 Dbi antenna (which doesn't require a > license) hurting anyone as long as he doesn't cause interference. > > Thanks > > Bob Cochran > > > > On 01/24/2011 03:23 AM, Cole Christensen wrote: >> Steve, >> >> To put it bluntly, what you want to do is a public nuisance and most >> likely illegal. >> >> If you typed correctly, you want a 1.5 km link or more which is 10x >> the normal maximum range of WiFi devices. >> >> Before you begin make sure you understand your local laws, do a >> detailed link budget, and consider those around you who want to use >> their wireless in it's legal, intended fashion. >> >> On Sun, Jan 23, 2011 at 2:40 PM, Steve Birch <st...@i-... >> <mailto:st...@i-...>> wrote: >> >> >> I'm currently working on a project using the onboard wifi >> (fire-summit) to >> transmit runtime data and images to a remote PC in a time critical >> application - still in the early planning stages. however, I'm >> curious on >> what "acceptable" ranges people are getting with the supplied u.fl >> antennas >> under normal circumstances. I'm contemplating using a u.fl to rev sma >> connector to fit a bigger antenna: has anyone tried to do this, >> and was it >> worth it/did it work? >> >> for reference i'm looking at pairing this: >> http://www.amazon.co.uk/inches-U-FL-pigtail-RP-SMA-female-connector/dp/B003S03DGM/ref=pd_sim_ce_6 >> ... with a 9dbi aerial on the overo side of things. at the PC end i'm >> looking at a 2W generic USB transmitter, also with 9dbi aerial(s) >> to bump-up >> the range. >> >> i'm not too sure how "good" the onboard wifi is strength-wise >> (generally i >> dont use wifi), hence looking for any advice on this one. >> range-wise, i'm >> looking at achieving clear line-of-sight of atleast 1500m >> distance, with as >> low signal attenuation as possible (allowing for much larger >> ranges to be >> attainable in the future). >> >> Steve >> -- >> View this message in context: >> http://old.nabble.com/overo-wifi-strength-with-different-antenna%3A-query-tp30743799p30743799.html >> Sent from the Gumstix mailing list archive at Nabble.com. >> >> >> ------------------------------------------------------------------------------ >> Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! >> Finally, a world-class log management solution at an even better >> price-free! >> Download using promo code Free_Logger_4_Dev2Dev. Offer expires >> February 28th, so secure your free ArcSight Logger TODAY! >> http://p.sf.net/sfu/arcsight-sfd2d >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> <mailto:gum...@li...> >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> >> >> >> ------------------------------------------------------------------------------ >> Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! >> Finally, a world-class log management solution at an even better price-free! >> Download using promo code Free_Logger_4_Dev2Dev. Offer expires >> February 28th, so secure your free ArcSight Logger TODAY! >> http://p.sf.net/sfu/arcsight-sfd2d >> >> >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users > > ------------------------------------------------------------------------------ > Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! > Finally, a world-class log management solution at an even better price-free! > Download using promo code Free_Logger_4_Dev2Dev. Offer expires > February 28th, so secure your free ArcSight Logger TODAY! > http://p.sf.net/sfu/arcsight-sfd2d > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Bob C. <bco...@ve...> - 2011-01-25 01:25:24
|
There are different types of wifi antennae around. Look into those intended for use with repeater stations. Antennae are an entire fine science, and I highly recommend you read up on them. I can't put you on to specific wifi antenna reading resources off the top of my head, but Google searches can help you. While my earlier post was a bit dismissive of a 9 dBi antenna, I do caution that the peak power output of your system needs to be carefully watched. 5 watts of output is enough to reach across entire continents in the right weather conditions. 2 watts can reach a very long distance indeed. Indeed there is an entire group of amateur radio users who pride themselves on QRP: low power radio transmissions of 5 watts or under. You need to be licensed to use amateur radio bands, regardless of power output. It helps a lot if you take a licensing class in amateur radio, and pass the exam and requirements for at least the lowest class of amateur license in your country. The point here is not to "be legal" although respect for your country's laws is very important. The real point is to come into contact with genuine technical leaders who know radio and practice the hobby seriously and who can give you very good advice and point you to genuine wifi experts. The child in the local Best Buy store is most unlikely to qualify in this regard. You will make a lot of new friends and have a real blast at the local amateur radio club meets. Read, take license exam preparation classes, read the study guides, take and pass the exams, and start meeting very fine electronics experts. What a blast that is! That is what I did. Only tried to get data off the packet radio frequencies one time, but I met a lot of really great electronics guys with rigs, and that is what I was looking for. Bob Cochran On 01/23/2011 03:40 PM, Steve Birch wrote: > I'm currently working on a project using the onboard wifi (fire-summit) to > transmit runtime data and images to a remote PC in a time critical > application - still in the early planning stages. however, I'm curious on > what "acceptable" ranges people are getting with the supplied u.fl antennas > under normal circumstances. I'm contemplating using a u.fl to rev sma > connector to fit a bigger antenna: has anyone tried to do this, and was it > worth it/did it work? > > for reference i'm looking at pairing this: > http://www.amazon.co.uk/inches-U-FL-pigtail-RP-SMA-female-connector/dp/B003S03DGM/ref=pd_sim_ce_6 > ... with a 9dbi aerial on the overo side of things. at the PC end i'm > looking at a 2W generic USB transmitter, also with 9dbi aerial(s) to bump-up > the range. > > i'm not too sure how "good" the onboard wifi is strength-wise (generally i > dont use wifi), hence looking for any advice on this one. range-wise, i'm > looking at achieving clear line-of-sight of atleast 1500m distance, with as > low signal attenuation as possible (allowing for much larger ranges to be > attainable in the future). > > Steve |