[bars] RF Exposure Calculator

[Jim Idelson]

How does it work out at .5 watt on 800mhz at 1 inch?

73 Jim K1IR

On Fri, Aug 6, 2021, 1:18 AM Bruce Anderson <w1lus at hotmail.com> wrote:

> We are all required to calculate the RF exposure to people from our
> transmissions.
> The results should show that our antennas are located far enough from
> people so no one gets over exposed.
> Or inversely where to locate our antennas to prevent over exposing people
> to our transmissions.
> The ARRL has provided a simple calculator for hams to determine this
> minimum safe distance.
>
> http://arrl.org/rf-exposure-calculator
> RF Exposure Calculator <http://arrl.org/rf-exposure-calculator>
> The FCC has adopted guidelines and procedures for evaluating environmental
> effects of RF emissions. The new guidelines incorporate two tiers of
> exposure limits based on whether exposure occurs in an occupational or
> "controlled" situation or whether the general population is exposed or
> exposure is in an "uncontrolled" situation.
> arrl.org
>
> Below in a sample calculation I did for my FT 8 transmissions on 20 Meters
> running 100 watts to a half wave dipole.
>
> The results show two feet away for myself and family is safe and 4.5 feet
> away is safe for Neighbors.
> Of course, since the antenna is over 15 feet high there is no issue with
> this antenna and power on 20 Meters.
>
> RF Exposure Calculator
> Parameters
> Power at Antenna: 100 (watts)
> Mode duty cycle: AFSK SSB (duty cycle=100%)  (FT 8)
> Transmit duty cycle: (time transmitting)
> You transmit for 1 minutes then receive for 1 minutes (and repeat).
> Antenna Gain (dBi): 2.15 (1/2 wave Dipole)
> Operating Frequency (MHz): 14.074
> Include Effects of Ground Reflections
>
> Results for a controlled environment:
> Maximum Allowed Power Density (mw/cm2): 4.5437
> Minimum Safe Distance (feet): 1.9897
> Minimum Safe Distance (meters): 0.6065
>
> For an uncontrolled environment:
> Maximum Allowed Power Density (mw/cm2): 0.9087
> Minimum Safe Distance (feet): 4.4490
> Minimum Safe Distance (meters): 1.3561
>
> Bruce
> W1LUS
>
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