[Elecraft] Was Amplifier

[brian]

"Considered dangerous" isn't quite right.  The jury is out of the exact 
danger levels of RF for all the various frequencies.  These distances 
are more of an accepted limit that protects you from inquiries regarding 
RF exposure.  Pointing to the distances being met helps get you off the 
hook.

People will be surprised to see how small the distances these 
calculations are-- especially at lower frequencies.

One note often overlooked. The distance is defined as the distance from 
feedpoint (usually center) of the antenna.

Also the duty cycle can be considered in the calculation.  There are 
stock duty cycles for SSB and CW given in the documentation.

Antenna gain may have to be included.

It used to be that anything at 100 watts and below at HF was exempted.
I believe that has changed.

73 de Brian/K3KO



On 4/7/2017 16:06 PM, Edward R Cole wrote:
> In the USAmerica ham's now have the *responsibility* of determining the
> safe operating zones for each antenna per FCC regulation.  I doubt many
> ever do the calculation.  Fortunately Australian ham Doug MacArthur (sk)
> VK3UM (a well known eme'r) has written a program which you can download
> for free.  I will simulate the emf fields base on your input data like
> antenna, power, height, band and produces the legal exclusion zones
> where RF exposure is considered dangerous.
>
> http://www.vk3um.com/emr%20calculator.html
>
> Its not hard to use and provides some interesting if not surprising info
> about your station safety.
>
> As I already stated, it is the legal requirement for all US hams to have
> evaluated safe range for humans before operating.
>
> Eg:  half-wave dipole, 1400w, line loss 0.5 dB, 14.2 MHz: exclusion =
> 3.06m radially; safe height 2.60m for FCC.  Also provides ARPNSA and CEU
> radiation limits.
>
> 73, Ed - KL7uW
>