[Elecraft] Re: RF radiation review

[Brian Murphy]

Hello Daniel,

I would suggest the arrl.org site for the best starting place.

To my knowledge, some review is always necessary, but a detailed evaluation
is explicitly required for higher power and higher frequencies.  Usually, hf
is fine at 100 watts or lower.  This requirement came about the time that
the Extra question pool was changed several years ago to accommodate just
this law.  ARRL should have the particulars and credibility for accuracy of
the requirements.

I have seen an internet calculator for standard dipoles; you just supply the
height, frequency, and dimensions and it calculated the fields that might
pose a hazard to living animals and people.  I wish I had that site saved.

Basically, animals and people should stay a safe distance from radiating
antennas, transmission lines, etc.  When I tried the calculator, a 30 foot
separation from the dipole was deemed acceptable for 1000 watts on most hf
bands if my memory serves me well.  Of course, QRP is probably safe to
within a few inches I would guess (rf levels probably decrease in a 1/(r
squared) relationship to distance(r) from wire).  But, check the website for
the best answers.

Hope this helps,

Brian N4YTL

> From: ham_tech@juno.com
> Date: Thu, 27 Jun 2002 23:39:08 -0700
> To: n4ytl@arrl.net
> 
> Hey Brian,
> 
> You had mentioned something about:  " rf radiation review now required by
> the FCC"
> 
> Where can I find out about this new law?
> 
> Daniel