The way I understand it, and have worked to my advantage as a ham, is the layers stratify at fairly definite borders in tropospheric ducting. The layer works more like a duct with a mirror like top. The signals can be repeatedly "reflected" back down into the duct.
I did some experiments during one tropo opening using some long circular polarized yagis at both vhf and uhf. The signals appear to become more randomly polarized as the distance in the duct increases. The signals coming from areas around the Gulf coming into SW Fl during the events had components of both vertical and horizontal polarization. Refraction is the deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different. So, both upon entering and leaving the duct the signal can also be subject to refraction? Not sure. Mike At 10:52 AM 8/9/2009, you wrote: >That is correct. So my next question: Can refraction be caused by >thermal ducting? -RickG -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
