Hi Andy,
A very close 40 meter antenna is much safer than a close 12 or 10 meter antenna See FCC Amateur Radio Regulations: Part 97.13 Restrictions on station location. (c) Before causing or allowing an amateur station to transmit from any place where the operation of the station could cause human exposure to RF electromagnetic field levels in excess of those allowed under §1.1310 of this chapter, the licensee is required to take certain actions. (1) The licensee must perform the routine RF environmental evaluation prescribed by §1.1307(b) of this chapter, if the power of the licensee's station exceeds the limits given in the following table: Evaluation required if power in (watts) exceeds: 160m 500 watts 80 m 500 watts 75 m 500 watts 40 m 500 watts 30 m 425 watts 20 m 225 watts 17 m 125 watts 15 m 100 watts 12 m 75 watts 10 m 50 watts (2) If the routine environmental evaluation indicates that the RF electromagnetic fields could exceed the limits contained in §1.1310 of this chapter in accessible areas, the licensee must take action to prevent human exposure to such RF electromagnetic fields. Further information on evaluating compliance with these limits can be found in the FCC's OET Bulletin Number 65, “Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields.” 73 Frank W3LPL ----- Original Message ----- From: "Andy Durbin" <[email protected]> To: [email protected] Sent: Sunday, April 19, 2020 12:07:13 AM Subject: [Elecraft] Excessive SWR Faulting KPA500 "At a distance of only six feet to your antenna, perhaps your amplifier is trying to warn you that you may also have a human RF safety issue. " Well, do you feel warm.... We do what we must to get a signal out. My 40 m dipole is in the attic of a single story house under an asphalt and fibreglass radome. Yes I have RF in the "shack" and every other room in the house. My choice how high I turn the wick though and that choice is less than 500 W. My "controller" prevents my getting excited and turning the wick up all the way. Antenna is well matched though and KPA500 is happy. The only problems I've had with an unhappy KPA500 were on 20 m. 73, Andy, k3wyc ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
