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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>It occurred to me that the younger generation out there might not get my comment from my earlier message (though given our demographics I am sure most us of DO get it). So check out the 30 second YouTube video from the 1980’sTV commercial “This is your brain on drugs”.<o:p></o:p></p><p class=MsoNormal>NF1A<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> bars <bars-bounces@w1hh.org> <b>On Behalf Of </b>apizer@comcast.net<br><b>Sent:</b> Friday, August 6, 2021 9:03 PM<br><b>To:</b> 'Jim Idelson' <jim@k1ir.com>; 'BARS Reflector' <bars@w1hh.org><br><b>Subject:</b> Re: [bars] RF Exposure Calculator<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>That is 1<sup>st</sup> generation cell phone tech but we were all subjected to it. This is your brain. This is your brain on 800 MHz (or 900, or 1.9G. or 2.4G . . . )<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> bars <<a href="mailto:bars-bounces@w1hh.org">bars-bounces@w1hh.org</a>> <b>On Behalf Of </b>Jim Idelson<br><b>Sent:</b> Friday, August 6, 2021 8:11 PM<br><b>To:</b> BARS Reflector <<a href="mailto:bars@w1hh.org">bars@w1hh.org</a>><br><b>Subject:</b> Re: [bars] RF Exposure Calculator<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'>How does it work out at .5 watt on 800mhz at 1 inch?<o:p></o:p></p><div><p class=MsoNormal>73 Jim K1IR<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Fri, Aug 6, 2021, 1:18 AM Bruce Anderson <<a href="mailto:w1lus@hotmail.com">w1lus@hotmail.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'>We are all required to calculate the RF exposure to people from our transmissions.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'>The results should show that our antennas are located far enough from people so no one gets over exposed. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'>Or inversely where to locate our antennas to prevent over exposing people to our transmissions.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'>The ARRL has provided a simple calculator for hams to determine this minimum safe distance.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'><a href="http://arrl.org/rf-exposure-calculator" target="_blank">http://arrl.org/rf-exposure-calculator</a><o:p></o:p></span></p></div><div><div style='margin-top:12.0pt;margin-bottom:12.0pt;min-width:424px' id="m_-5927153351699497325LPBorder_GTaHR0cDovL2Fycmwub3JnL3JmLWV4cG9zdXJlLWNhbGN1bGF0b3I."><table class=MsoNormalTable border=1 cellpadding=0 width="100%" style='width:100.0%;border:solid #C8C8C8 1.0pt'><tr><td width="100%" valign=top style='width:100.0%;border:none;padding:9.0pt 27.0pt 9.0pt 9.0pt'><div style='margin-right:6.0pt;margin-bottom:9.0pt' id="m_-5927153351699497325LPTitle376237"><p class=MsoNormal><span style='font-size:16.0pt;font-family:"Segoe UI Light",sans-serif'><a href="http://arrl.org/rf-exposure-calculator" target="_blank"><span style='text-decoration:none'>RF Exposure Calculator</span></a><o:p></o:p></span></p></div><div style='margin-right:6.0pt;margin-bottom:9.0pt;max-height:100px;overflow:hidden' id="m_-5927153351699497325LPDescription376237"><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#666666'>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.<o:p></o:p></span></p></div><div id="m_-5927153351699497325LPMetadata376237"><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#A6A6A6'><a href="http://arrl.org" target="_blank">arrl.org</a><o:p></o:p></span></p></div></td></tr></table></div></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'>Below in a sample calculation I did for my FT 8 transmissions on 20 Meters running 100 watts to a half wave dipole.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'>The results show two feet away for myself and family is safe and 4.5 feet away is safe for Neighbors.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'>Of course, since the antenna is over 15 feet high there is no issue with this antenna and power on 20 Meters. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;color:black'><o:p> </o:p></span></p></div><div><div style='margin-bottom:9.0pt;outline:0px'><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>RF Exposure Calculator <o:p></o:p></span></p><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Parameters<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Power at Antenna: 100 (watts)<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Mode duty cycle: AFSK SSB (duty cycle=100%) (FT 8)<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Transmit duty cycle: (time transmitting)<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>You transmit for 1 minutes then receive for 1 minutes (and repeat).<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Antenna Gain (dBi): 2.15 (1/2 wave Dipole)<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Operating Frequency (MHz): 14.074<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Include Effects of Ground Reflections<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Results for a controlled environment:<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Maximum Allowed Power Density (mw/cm2): 4.5437<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Minimum Safe Distance (feet): 1.9897<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Minimum Safe Distance (meters): 0.6065<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>For an uncontrolled environment:<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Maximum Allowed Power Density (mw/cm2): 0.9087<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Minimum Safe Distance (feet): 4.4490<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Minimum Safe Distance (meters): 1.3561<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>Bruce<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'>W1LUS<o:p></o:p></span></p></div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#224466'><o:p> </o:p></span></p></div></div></div><p class=MsoNormal>_______________________________________________<br>bars mailing list<br><a href="mailto:bars@w1hh.org" target="_blank">bars@w1hh.org</a><br><a href="http://mail.w1hh.org/mailman/listinfo/bars_w1hh.org" target="_blank">http://mail.w1hh.org/mailman/listinfo/bars_w1hh.org</a><o:p></o:p></p></blockquote></div></div></body></html>