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R: Parabolic Antenna RF Power Density Calculations



Peter VA3YOW,

I suggest you to read "RF Safety Practices" by Dr. David Davidson
W1GKM (SK) published in The ARRL UHF/MICROWAVE Experimenter's
Manual Chapter 2 pages 2-1 to 2-9

73" de i8CVS Domenico

----- Original Message -----
From: Peter Devanney <pdevanney@sympatico.ca>
To: <amsat-bb@AMSAT.Org>
Sent: Saturday, March 22, 2003 8:51 PM
Subject: [amsat-bb] Parabolic Antenna RF Power Density Calculations


> 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
>
> ----
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