Check the latest Novice/Tech license manual (Question Pool) It has
numerous examples of common antenna setups and powers for both
controlled and uncontrolled limits (See Graphic NT0-1, which is used for
both elements 2 and 3A).
Ward Silver wrote:
> On Fri, 14 Nov 1997, Roderick M. Fitz-Randolph wrote:
> > (1) "Problem areas seem to be mostly lowband dipoles low to the ground..."
> > That pretty much does away with 80 meter delta loops whose base leg
> > is in proximity to the ground that places it out of compliance. It
> > also does away with "Cloud Warmers" for contesting.
> Only if the wire is VERY CLOSE to uncontrolled exposures - which
> translates to "don't put it up over your neighbor's property"...I think
> the recommended separations were on the order of 10-20 feet (going from
> memory here, don't take this as gospel) when running high-power. A
> back-yard dipole, well away from your property lines will probably be
> comfortably within the exposure limits.
> If your antenna is a "stealth" wire and you're running high-power, then
> you might want to reconsider. Of course, in this situation, you're
> probably lighting up everything in the house and the spousal disapproval
> is more formidable than any possible governmental trouble.
> > (2) "HF antennas mounted at reasonable heights are nowhere near exceeding
> > exposure limits even at full power".
> > What's "reasonable heights"... this year?... next year?.. 10 years?
> Thirty feet gets you out of the zone of concern in nearly all cases.
> The point about un-founded concerns is something to think about, of
> course. The real problem that is completely unaddressed is that of
> cellular phones. However, all the research has failed to turn up anything
> at all definite.
> My point in bringing all this up was not to get into a huge discussion of
> what is and isn't in compliance. (Actually, hams have ALWAYS been liable
> for compliance with exposure limts, it's just that the limits are
> changing.) The comments were made only to say, "The ARRL has a team
> working on it and an excellent guide to making your evaluations will be
> made available shortly." Also, from what I've seen, the vast majority of
> installations are comfortably within the exposure limits.
> 73, Ward N0AX
> FAQ on WWW: http://www.contesting.com/towertalkfaq.html
> Submissions: firstname.lastname@example.org
> Administrative requests: towertalk-REQUEST@contesting.com
> Problems: email@example.com
> Search: http://www.contesting.com/km9p/search
Scotty Neustadter, W4WW ex N4PYD W4WW@nadxc.org
Chairman, Huntsville Hamfest North Alabama DX Club
Question Pool Committee, NCVEC Fax 205 880 9530
"Hold the screwdriver by the fat yellow end"
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Administrative requests: towertalk-REQUEST@contesting.com