[TowerTalk] FCC RF Safety Regs Info Sept 1

[Ian White, G3SEK]

Fred Hopengarten wrote:
>Gentlemen:
>
>       While it is true that the N5XU calculator is what Chip says it is -- a
>worst case, you may legitimately make your case better.
>
>You may reduce average power to the antenna by:
>
>Feed line loss (see Hare, Figure 5.6 then Figure 5.2)
>Connector loss (if VHF or UHF)
>Duty factor (see Hare, Figure 5.4, generally 40%), and 
>Time (generally, you multiply power by .67 for 10 minutes on, 10 minutes
>off, and 10 minutes on  -- a 50% duty-cycle during the 30 minute test
>period).
>
>Calculate distance to the area of interest by including the trigonometry
>(Hare, Figure 5.9)
>
>References are to the Hare book published by the ARRL.

"RF Exposure and You" - it contains many examples of NEC calculations
for typical antennas, that *do* take account of near-field and
transition-region effects. There's lots of good information there, as
Fred says.

It's about five years too late to wake up and start complaining about
the basis for the regulations - they have been coming down the tunnel at
you for several years, and now they're here! FYI, the ARRL book has been
available since 1998. 

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
                           http://www.ifwtech.com/g3sek

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