On 19:29:08 May 11, Sivasankar Chander wrote: > Certainly odd news. The GPS C/A receive signal is at 1575 MHz, > which can face interference from certain kinds of microwave ovens > and microwave devices. But my simple guess is that the tree cover > at IITM is causing too much attenuation of the signal from the > satellites at low elevations from the horizon. I've seen this behaviour > before from Garmin units - they need a clear line-of-sight to > the satellites for optimal performance.
The frequency sounds too low and that would cause all sorts of propagation problems. I believe there are various factors at play here. Firstly as Sivachander suggested vegetation is a big problem. And for certain frequencies, the moisture/rain/weather etc. Secondly GPS satellites are not geostationary (Am I wrong?). So their orbits may not be favorable at certain times. IOW testing it during a hot summer day and collecting multiple samples might help. -Girish _______________________________________________ To unsubscribe, email [EMAIL PROTECTED] with "unsubscribe <password> <address>" in the subject or body of the message. http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
