[time-nuts] Advice on sighting a roof mounted gps area please

2014-10-12 Thread swingbyte
Hi All, I am building a house extension and part of the works involves adding a new hip roof made of corrugated iron. I was thinking I would pass a 50mm pvc pipe through the roof with a tee and then mount two conical gps timing antennas on top of it. I am in a low point and don't have

Re: [time-nuts] Advice on sighting a roof mounted gps area please

2014-10-12 Thread paul swed
Tim The antennas should not interfere with each other due to rf leakage because of the way the systems are designed. I will believe you are using 2 rf feeds. The more you can clear the trees the better. My very simple solution is a 90' tower. A bit of humor it does have other uses. Regards Paul

Re: [time-nuts] Advice on sighting a roof mounted gps area please

2014-10-12 Thread Chris Albertson
First off, why only 50mm and why plastic? The PVC will degrade in the sunlight over the years. Use galvanized iron pipe. Make the mast as tall as you can. It can extend sever feet below the roof and attach to house structure using u-bolts. (Hight limited only by appearance from the street.)

Re: [time-nuts] Advice on sighting a roof mounted gps area please

2014-10-12 Thread Bob Camp
Hi If you are going to get any benefit from multiple antennas, you want to space them as far apart as possible. You are better off with one antenna and a splitter than with two close spaced antennas. The cost of mucking around on the roof is non-trivial. The world is headed to L1/L2

Re: [time-nuts] Advice on sighting a roof mounted gps area please

2014-10-12 Thread Hal Murray
kb...@n1k.org said: If you are going to get any benefit from multiple antennas, you want to space them as far apart as possible. You are better off with one antenna and a splitter than with two close spaced antennas. Does anybody have data? How would I measure it? Where is the knee? I

Re: [time-nuts] Advice on sighting a roof mounted gps area please

2014-10-12 Thread Bob Camp
HI Many years ago, we got dinged on customer visit when they spotted our GPS antenna array on the roof. The claim made at the time was that anything under 20’ spacing was counterproductive. I’ve seen numbers like 5, 8, 10,15 and 25 feet mentioned by different people at different times. The