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*Subject*: [amsat-bb] Parabolic Antenna RF Power Density Calculations*From*: "Peter Devanney" <pdevanney@xxxxxxxxxxxx>*Date*: Sat, 22 Mar 2003 14:51:39 -0500

I would like to correspond with anyone who has done Power Density calculations on Parabolic Antennas. I have been using the formulas in the OET Bulleting 65 and I am not sure if I have the results correct. Based on a 1.8m/46.5 DBi gain dish operating at Ku band (14.4GHz) with 62.5mw average power output I get a far field boundary at 97m and a near field boundary at something like 1.7cm with the transition region in between. Interestingly my PD calculation agrees with the online calculator at the UoTexas web site (at 97m). The near field region has been more confusing. The online calculator has a much higher PD at say 3feet from the antenna than I am getting with the bulletin equations. Has anyone had success with the equations in the bulletin or found errors with them? When calculating distance or R is it from the surface of the dish or from the feed? I would be curious what others might get for a power density at say 1 meter (3feet) from the antenna along axis. Just trying to make sense of the equations. Peter VA3YOW ---- Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

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