Guys how to celebrate LINE OF SIGHT

Hi guys was up guys i need to know that i am deploying a wireless network using a dlink yagi ant its a line of sight ant so tell me how can i celebrate? i got all equiment like GPS or there is any other device plz tell me how can i do this your help will be very kind[ ]

 

hey guys what happened with you all atlast reply me i am very big truble i need help

 

I don't think anyone understands your question, at least I don't.

Brian

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hey guys sorry for misunderstand let me explain you my question well well i need to know that i have two Yagi ant well its a dlink product and i need to calibrate them how will i do this and do i need clear line of sight to calibrate between two ant[ ][ ]plz reply as soon as possiable

 

I think he means:

I have two 'Yagi' antennaes and it is on a D-Link product. I need to find out how to calibrate them. Do I need a clear line of sight to calibrate the two antennaes?

Thanks.

 

Wow this is pretty deep stuff. Don't know whether anybody here knows how to do it. I'd be interested if anybody does know though.

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[ ]thanks guys but any one here who got the experiance to calibrate

 

I think some more information on the problem would be very helpful as many factors can influence your procedure. What is the distance between the two points being linked? Is an indoor installation, or outdoor? What type of environment and terrain? Lots of fog/hills/nearby microwave antennas etc?

The shorter the distance, the easier the link will be to establish. Flat, clear ground with few trees is best for outdoor links, and open buildings like warehouses and stadiums are easier than office environments.

 

well the distance is 6 kilometers and its a clear line of sight no hills no obsticals but there are lots of trees but there elevation are lower then my building well here is the project i want to deploy point to point WlAN Solutions so i buy two Dlink access points model# DWL-2100AP and yagi antennas with ultra lowloss cables and two 1watt Apmlifire so tell me is it possiable or not and the main thing i want to know that how people celibrate line of sight antennas i mean which divices you people use for celibrations[ ]

 

Ok the first thing that comes to mind is that you should have done your homework before buying said equipment. Second is was it really necessary to buy said equipment?

Based on you saying calibrating line of sight antennas I would assume the manual that came with the equipment tells you what the distance is for calibrations. There's probably like a software program that comes with the equipment that says place the antenna x distance from the source with nothing in the way.

And it should be as easy as that. Of course this could be completely off since I have no experience with line of sight equipment.

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I think you've gone WELL beyond the scope of this forum. I don't think anyone here is running a WLAN over 4 miles (6 km), even if it is line of site. You'd need a huge antenna, or an amplifier, or both, to get a typical signal to run that far.

Try searching on Google for wifi antennas and such. There are some people that play around with this stuff, but you're getting into the realm of radio electronics and such, not laptops.

Russ

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By calibrate, I think you mean "align the two antennas" ... you may be lucky enough to guess the general direction and with someone at the other end in contact with you by phone, you can use the monitoring software that came with the D-Link to fine tune the signal by small adjustments to the antenna direction.

BTW, D-Link is not a very good brand to use in such situations.

 

First things first - for that distance, DLink is NOT the way to go. You would need something akin to a Cisco 1300 outdoor. Secondly, do you have enough height on the antennas to do the install? Remember that as you start to go to the distances we're discussing here, you have to take the curvature of the earth into consideration, as well as how it interferes with the AP/antenna's Fresnel zone.

Your best bet would be to put up two temporary masts, with the Yagi's at each end. You can use GPS coordinates and a GOOD compass (survey quality) to get your basic aiming down. You will then need to fine tune the install with a signal strength meter of some sort.

Perhaps the biggest help in your situation would be doing some additional research. Not to sound like a Cisco bigot, but they've got some really good documentation on the subject. Go to their site and do searches for "Outdoor Bridge Range Calculation Utility" and "Wireless Antenna Range White Paper".

Good luck, and if you have any further questions, feel free to post 'em.

 

Okay here is what i would do get a compass go to one of the antennas and stand exactly the way it is pointing and use the compass if is 180 degress or over go to the other antenna and subtract 180 degrees from it and point in that direction and it should be fairly close.

Also if it is under 180 add 180 to it when you get to the other antenna and it should be point in that direction.

EX: Antenna A is pointed at 143 degrees so at Antenna B is pointed at 323 degrees and it should be pointed at each other

I hope this helps i am a Paratrooper in IRAQ and i do this kind of stuff all the time

 

well guys you are right Dlink DWL-2100ap is not good for this kind of situation but how about Dwl-2700ap its a outdoor 802.11g AP/Bridge with a 1 watt amplifar and the antenna i am using is 10km range antenna[ ] and i got the GPS also the main thing i am worried is how to calibrate the antenna i mean is there any software for this kind of situtions that how to calibrate and if this kind of software is avaliable then where can i get that kind of software and btw i want to know someting is there any hardware like pcmcia card which can connect external antenna or any PDA Device plz tell me if so let me know![ ]

 

You keep saying "calibrate" and I'm not sure I understand what you mean. ALL antennas sold for 2.4 GHz wireless applications are ALREADY calibrated for 2.4GHz use. Now if you mean "align" the antenna to "see" another then several of us have already given our opinions on how to do that.

For a pcmcia wireless card with an external antenna connection you have a couple choices:

1. The Orinoco Proxim Gold - has both internal antenna AND an external antenna connector.
2. The Senao (or Engenius) 200mW (high power) card. This one I would recommend for your application if you are now thinking of going pcmcia - you may not need the external amplifier.

 

The DWL2700 has a built in RSSI meter (LEDs that show signal strength), but since you're also using an inline amp, it's value will be greatly reduced. The amp will provide a hot signal to the WAP, even if there is little or no real signal.

The spec'd range on the antenna is less important than it's dBm gain; given that spec and the known power output of the WAP and amp, we should be able to calculate if the amp is even necessary. Can you tell us what the dBi rating on the antenna is? Also, you mentioned trees in the link's line of sight - how tall are they? Keep in mind to get a signal you will have to mount the antennas well above their tops.

I would recommend trying the link w/o the amp just so you can use the built-in meter. Once the antennas are mounted and the link established, you can add the amps if your signal strength is still low.

As for the PCMCIA cards which accept an external antenna, I know that the old Orinoco silver and gold series 802.11b cards have a mini-SMA connector. Check out this link: http://www.chem.hawaii.edu/uham/hnet.html

 

Well thanks rufio I think are you a experience person who knows about some line of sight communications. You have asked me about the DBI well it’s a 21DBI antenna and you have asked me a height of trees I think I don’t know exactly but I can tell you the height of building where I am planning to deploy the antenna well building #A it’s a 80 feet’s and building #B is 75 feet’s so I am putting a 10feet’s mast on building A. and 15feet’s mast on building B here is the information rufio you have asked me if you want to know any thing more feel free and ask me I will be very glad to tell you and thanks ones again for helping me

 

djrapidjazz,

I suggest you check out the wireless section of the discussions forums at the Australian site www.whirlpool.net.au , where some people are successfully using wireless connections over distances of more than 40km.

Try searching "distance". See, for example: http://forums.whirlpool.net.au/forum-search.cfm?s=114634&r=3896161

You could also try the information on Rob Clark's site. See http://www.wafreenet.org/?page=docinfo

 

dj, you should be able to install the AP's without having to use the inline amp, and still get a decent speed. The facts and figures:

D-Link DWL-2100AP
TX Power - 32mW
RX Sensitivity - -86dBm at 9Mbps
Antenna gain - 21dB

Assuming the manufactures' specs are correct, and using good (low-loss) antenna cables and connectors, you would have a 14dB margin at 6km. A 10dB margin is considered reasonably safe when calculating a wireless link. Keep in mind that this assumes a clear line of sight between the buildings, and at least 30 feet of height above the lowest obstacle on each end of the link.

Not needing the amp will make the aiming process easier, and you're going to need as much help as you can get. Start by getting the GPS coordinates of each site. If you have a GPS receiver, take readings at each site. Accuracy is VERY important here, so get as many decimal places as possible. Once you have the coordinates, use the following link to calculate the exact distance and bearing between the two points:

GPS Visualizer Calculators

With the bearing now calculated, you know where to aim each of the antennas. Hope this helps.