You didn't say if you tried the antenna under the power lines but outside the cabin. What is translucent to light may not be to microwaves.
David N1HAC At 05:15 PM 8/9/2008, you wrote: >Hi all, in the process of setting up a GPS time standard for a Radio >Astronomy facility (amateur) we installed a GPS receiver in a small cabin >with a translucent roof, thinking that would not impede the GPS signal. >After a lot of head scratching as to why we were not getting the performane >we got at another site, we realised that the "convenient position" for the >cabin was directly below a three phase 11kV power distribution line ( common >UK rural electricity distribution system). We extended the cable and moved >the antenna about 20 - 30 feet to the side of the line run, which was >mounted on wooden poles at about 25 feet. In this position we immediately >got a reliable fix. The fix and number of usable satellites degrades as we >move nearer the lines. > >The thought was that there as interference arcing or corona noise from the >line insulators, and a receiver (AM) was deployed to listen for what was >expected to be a substantial wide band noise signal....we didnt hear one! We >are now confused about what the effect is. The signal could not be >"screened" by the wires which are about 3 feet apart, but they definite >provide a cone of interference directly under the run. The experiment was >later repeated with two further different GPS receivers and produced the >same result. > >Has anyone seen this before? have you any idea of what level noise we should >be looking for? I believe this is a wide signal so maybe an AM receiver is >not the best choice The area is a rural, horticultural area (called market >garden in the UK) We are obviouslt concerned to trace any noise sources in >the vicinity of the Hydrogen line frequency at 1420MHz. > >Alan G3NYK > > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
