<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Very nice, Bruce, thanks for the pointer!<div class=""><br class=""></div><div class="">73, Willie N1JBJ</div><div class=""><div class=""><div><br class=""></div></div><div><blockquote type="cite" class=""><div class="">On Aug 6, 2021, at 1:18 AM, Bruce Anderson <<a href="mailto:w1lus@hotmail.com" class="">w1lus@hotmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta charset="UTF-8" class=""><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class="">We are all required to calculate the RF exposure to people from our transmissions.</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class="">The results should show that our antennas are located far enough from people so no one gets over exposed. </div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class="">Or inversely where to locate our antennas to prevent over exposing people to our transmissions.</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class="">The ARRL has provided a simple calculator for hams to determine this minimum safe distance.</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class=""><br class=""></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class=""><a href="http://arrl.org/rf-exposure-calculator" id="LPlnk" class="">http://arrl.org/rf-exposure-calculator</a><br class=""></div><div class="_EReadonly_1 _EType_OWALinkPreview _Entity _EId_OWALinkPreview" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div id="LPBorder_GTaHR0cDovL2Fycmwub3JnL3JmLWV4cG9zdXJlLWNhbGN1bGF0b3I." class="LPBorder376237" style="width: 800px; margin-top: 16px; margin-bottom: 16px; position: relative; max-width: 800px; min-width: 424px;"><table id="LPContainer376237" role="presentation" style="padding: 12px 36px 12px 12px; width: 750px; border: 1px solid rgb(200, 200, 200); border-top-left-radius: 2px; border-top-right-radius: 2px; border-bottom-right-radius: 2px; border-bottom-left-radius: 2px;" class=""><tbody class=""><tr valign="top" style="border-spacing: 0px;" class=""><td style="width: 744px;" class=""><div id="LPTitle376237" style="font-size: 21px; font-weight: 300; margin-right: 8px; font-family: wf_segoe-ui_light, "Segoe UI Light", "Segoe WP Light", "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif; margin-bottom: 12px;" class=""><a target="_blank" id="LPUrlAnchor376237" href="http://arrl.org/rf-exposure-calculator" style="text-decoration: none; color: var(--themePrimary);" class="">RF Exposure Calculator</a></div><div id="LPDescription376237" style="font-size: 14px; max-height: 100px; color: rgb(102, 102, 102); font-family: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif; margin-bottom: 12px; margin-right: 8px; overflow: hidden;" class="">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.</div><div id="LPMetadata376237" style="font-size: 14px; font-weight: 400; color: rgb(166, 166, 166); font-family: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif;" class=""><a href="http://arrl.org/" class="">arrl.org</a></div></td></tr></tbody></table></div></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class=""><br class=""></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class="">Below in a sample calculation I did for my FT 8 transmissions on 20 Meters running 100 watts to a half wave dipole.</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class=""><br class=""></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class="">The results show two feet away for myself and family is safe and 4.5 feet away is safe for Neighbors.</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class="">Of course, since the antenna is over 15 feet high there is no issue with this antenna and power on 20 Meters. </div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class=""><br class=""></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 18pt;" class=""><div style="margin: 0px 0px 12.0012px; outline: 0px; font-size: 12.0012px; background-color: rgb(255, 255, 255); line-height: 1.5; color: rgb(34, 68, 102); font-family: Arial, sans-serif;" class="">RF Exposure Calculator<div class="">Parameters</div><div class="">Power at Antenna: 100 (watts)</div><div class="">Mode duty cycle: AFSK SSB (duty cycle=100%) (FT 8)</div><div class="">Transmit duty cycle: (time transmitting)</div><div class="">You transmit for 1 minutes then receive for 1 minutes (and repeat).</div><div class="">Antenna Gain (dBi): 2.15 (1/2 wave Dipole)</div><div class="">Operating Frequency (MHz): 14.074</div><div class="">Include Effects of Ground Reflections</div><div class=""><br class=""></div><div class="">Results for a controlled environment:</div><div class="">Maximum Allowed Power Density (mw/cm2): 4.5437</div><div class="">Minimum Safe Distance (feet): 1.9897</div><div class="">Minimum Safe Distance (meters): 0.6065</div><div class=""><br class=""></div><div class="">For an uncontrolled environment:</div><div class="">Maximum Allowed Power Density (mw/cm2): 0.9087</div><div class="">Minimum Safe Distance (feet): 4.4490</div><div class="">Minimum Safe Distance (meters): 1.3561</div><div class=""><br class=""></div><div class="">Bruce</div><div class="">W1LUS</div><br class=""></div></div><span style="caret-color: rgb(0, 0, 0); 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