Eje said: "GPS will not tell direction. GPS only tells you direction while IT is moving. When your standing still it can't give directions."
Man, do you need to do a little reading on a GPS. I have used GPSs to sail across the Gulf of Mexico and they do heck of a lot more than give you lat/long... at least any built since 1993 will. Here is what you do. Go the base of each of your POP towers. Tell the GPS to save the current location as a 'waypoint'. Save each POP as a different waypoint. When you are on your customer's site, whip out the GPS and tell it to 'Goto' the waypoint saved for the POP of your choice. It will quickly tell you distance and bearing (for example 2.8 miles @ 143*). You can check your LOS possibilities with each of your POPs by punching a couple of buttons. Now that I have distance and bearing, I need a compass to show me which way 143* is. A GPS will not show you your heading, only your 'course over ground' or COG. To have a COG, you have to be moving. To get heading while standing still, you need a compass. I use a lensatic compass like this: http://www.brasscompass.com/lensaticzinc.htm Dave -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Eje Gustafsson Sent: Sunday, September 07, 2003 2:17 PM To: Pascal Losier Subject: Re: [smartBridges] What device are you using to aligne antenna ???? GPS will not tell direction. GPS only tells you direction while IT is moving. When your standing still it can't give directions. So GPS used to figure out what long,lat your on as well altitude on both ends. Then do the math. http://www.fament.com/wireless/calculators/azimuth.php To figure out the Compass direction to aim the antenna. Up and downtilt can easily be calculated as well. All you need to know is your ASL (Above See level) your at in both locations (the antennas) http://www.fament.com/wireless/calculators/downtilt.php Not entirely designed for this type of calculations but if you normalize your levels and provide the amount of ' your one antenna end is over the other antenna. Then by not providing a beamwidth you can calculate out how far away the signal will hit ground with 0.5* downtilt or 1* and so forth. Then you aim in according to best measurements according to your calculations. When your dealing with say a 10 mile shoot and a antenna with 6* beam and you can't see the other end due to distance you have to figure out where pretty precisely you need to aim. Also when your doing calculations it's important to know if you get true north or magnetic north (above calcs are magnetic north). When I got our 12 mile link up I used a different application that was set (without me knowing) to give true north which meant it was about 4* off so when we had the antenna aimed where we compassed out that it was supposed to be we had no signal. So we took a chance and move it about 4* chancing the calcs was true north instead of magnetic and SIGNAL. What a relief. Best regards, Eje Gustafsson mailto:[EMAIL PROTECTED] The Family Entertainment Network http://www.fament.com Phone : 620-231-7777 Fax : 620-231-4066 - Your Full Time Professionals - eBay UserID : macahan --- searchable smartBridges mailing list archive. http://www.mail-archive.com/smartbridges40part-15.org/ -- PL> GPS tells you where is your tower. PL> Why a compass , if you have a GPS. PL> How does it help you to read your RSSI ?? PL> How does it help you to adjust for Uptilt or Downtilt ???? PL> -----Original Message----- PL> From: [EMAIL PROTECTED] PL> [mailto:[EMAIL PROTECTED] On Behalf Of Dave Covert PL> Sent: Sunday, September 07, 2003 3:07 PM PL> To: [EMAIL PROTECTED] PL> Subject: RE: [smartBridges] What device are you using to aligne antenna PL> ???? PL> I use a GPS and a compass... :) PL> Dave PL> -----Original Message----- PL> From: [EMAIL PROTECTED] PL> [mailto:[EMAIL PROTECTED] Behalf Of Pascal Losier PL> Sent: Sunday, September 07, 2003 8:21 AM PL> To: [EMAIL PROTECTED] PL> Subject: [smartBridges] What device are you using to aligne antenna ???? PL> What device are you guys using to align antenna ???? PL> Laptop, Palm, Walky-Talky, ...... PL> I think a Palm with a 10/100 would do it. PL> I just can't see myself at 200 feet high with a full tower case & a 22'' PL> Monitor !!!! PL> Or even the laptop, I think it it big to climb...... -- [This E-mail scanned for viruses by Declude Virus] ----------ANNOUNCEMENT---------- Don't forget to register for WISPCON IV http://www.wispcon.info/us/wispcon-iv/wispcon-iv.htm The PART-15.ORG smartBridges Discussion List To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe smartBridges <yournickname> To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe smartBridges) Archives: http://archives.part-15.org --- [This E-mail scanned for viruses by Declude Virus] --- [This E-mail scanned for viruses by Declude Virus] ----------ANNOUNCEMENT---------- Don't forget to register for WISPCON IV http://www.wispcon.info/us/wispcon-iv/wispcon-iv.htm The PART-15.ORG smartBridges Discussion List To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe smartBridges <yournickname> To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe smartBridges) Archives: http://archives.part-15.org
