DC> Eje said: "GPS will not tell direction. GPS only tells you direction while DC> IT is DC> moving. When your standing still it can't give directions."
DC> Man, do you need to do a little reading on a GPS. I have used GPSs to sail DC> across the Gulf of Mexico and they do heck of a lot more than give you DC> lat/long... at least any built since 1993 will. Sigh.. I think you need to read up yourself on GPS obviously. I don't really care how long you have used a GPS or not or where and learn to understand what is part of the GPS and it's protcol and how it works. DC> Here is what you do. Go the base of each of your POP towers. Tell the GPS to You don't need to teach me how to use a GPS. DC> save the current location as a 'waypoint'. Save each POP as a different DC> waypoint. When you are on your customer's site, whip out the GPS and tell it DC> to 'Goto' the waypoint saved for the POP of your choice. It will quickly DC> tell you distance and bearing (for example 2.8 miles @ 143*). You can check DC> your LOS possibilities with each of your POPs by punching a couple of DC> buttons. This has NOTHING to do with the GPS nor the way a GPS as protocol functions but rather a convenient added function. A GPS is a device that collect data from the GPS satellites it can hear and based on the data from them and which ones it hears it can calculate out the 2D (long,lat) or 3D (long,lat,height) where you are at. The waypoints are a extra added feature that you get as a additional feature thanks to the computer system that is in the GPS to do the math. A "raw" GPS such as the USB units you can purchase for laptops is the best example. The GPS receiver only streams a bunch of data it is then up to your computer to use this data. That your computer can save the data and give you azimuth bearings between 2 points (waypoints). So what you get a bearing. Tell me how do you use your GPS to utilize or point out this bearing ? You can NOT do that with a standard GPS. DC> Now that I have distance and bearing, I need a compass to show me which way DC> 143* is. A GPS will not show you your heading, only your 'course over BINGO.. As I said from the start. With a normal GPS you can NOT figure out the the heading your facing (UNLESS YOUR MOVING).. However as I said 2 posts back there are GPS units that have compass built in to them that can be used to tell you the bearing your looking at (not the a calculated bearing). Now that you have agreed to the point I made originally we can go on since your now agreeing with the fact that you can not tell the direction your facing with your GPS but you have to have your compass to do that.. Which is what I said all along. DC> ground' or COG. To have a COG, you have to be moving. To get heading while DC> standing still, you need a compass. I use a lensatic compass like this: DC> http://www.brasscompass.com/lensaticzinc.htm Correct. This is what I tried to tell you all the way from the start of this thread. I'm not the one that needs to go back and learn and read up on GPS but rather you should go back and reread my posts to see what I said. But also there are GPS's that have built in compasses so you have a single convineient unit and you can have your GPS tell you your heading while your standing still. As a example http://www.amazon.com/exec/obidos/tg/detail/-/B000058BCR/104-2946105-4568733?v=glance http://www.thegpsstore.net/detail_MA61620.asp To mention a couple that have a built in electronic compass that works when your standing still and is not based on the GPS satellite data feed calculations. So thanks for finally agreeing with me to bad you had to start off claiming that I needed to do some reading on GPS systems when you later on agrees to what I said all a long.. sigh.. - Eje DC> Dave DC> -----Original Message----- DC> From: [EMAIL PROTECTED] DC> [mailto:[EMAIL PROTECTED] Behalf Of Eje Gustafsson DC> Sent: Sunday, September 07, 2003 2:17 PM DC> To: Pascal Losier DC> Subject: Re: [smartBridges] What device are you using to aligne antenna DC> ???? DC> GPS will not tell direction. GPS only tells you direction while IT is DC> moving. When your standing still it can't give directions. So GPS used DC> to figure out what long,lat your on as well altitude on both ends. DC> Then do the math. DC> http://www.fament.com/wireless/calculators/azimuth.php DC> To figure out the Compass direction to aim the antenna. DC> Up and downtilt can easily be calculated as well. All you need to know DC> is your ASL (Above See level) your at in both locations (the antennas) DC> http://www.fament.com/wireless/calculators/downtilt.php DC> Not entirely designed for this type of calculations but if you DC> normalize your levels and provide the amount of ' your one antenna end DC> is over the other antenna. Then by not providing a beamwidth you can DC> calculate out how far away the signal will hit ground with 0.5* downtilt DC> or 1* and so forth. DC> Then you aim in according to best measurements according to your DC> calculations. DC> When your dealing with say a 10 mile shoot and a antenna with 6* beam DC> and you can't see the other end due to distance you have to figure out DC> where pretty precisely you need to aim. Also when your doing DC> calculations it's important to know if you get true north or magnetic DC> north (above calcs are magnetic north). When I got our 12 mile link up DC> I used a different application that was set (without me knowing) to DC> give true north which meant it was about 4* off so when we had the DC> antenna aimed where we compassed out that it was supposed to be we DC> had no signal. So we took a chance and move it about 4* chancing the DC> calcs was true north instead of magnetic and SIGNAL. What a relief. DC> Best regards, DC> Eje Gustafsson mailto:[EMAIL PROTECTED] DC> The Family Entertainment Network http://www.fament.com DC> Phone : 620-231-7777 Fax : 620-231-4066 DC> - Your Full Time Professionals - DC> eBay UserID : macahan DC> --- DC> searchable smartBridges mailing list archive. DC> http://www.mail-archive.com/smartbridges40part-15.org/ DC> -- 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...... 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