Thanks, Bob. I received a couple of other private replies raising the same question, about RF exposure using an amp and an indoor antenna. There is an RF exposure calculator available on the ARRL’s site, or directly at http://hintlink.com/power_density.htm. My configuration at 100 watts is only about 1/4 of the safe maximum. Nonetheless your caution is appreciated and well advised - hence my posting the calculator site here for any others who might be sitting close to their antennas.
Ted, KN1CBR ------------------------------ Message: 21 Date: Sat, 30 Jan 2016 18:48:29 -0600 From: Bob McGraw K4TAX <[email protected]> To: [email protected] Subject: Re: [Elecraft] KXAT100 "Hunting" Message-ID: <[email protected]> Content-Type: text/plain; charset=utf-8; format=flowed Candidly, I would be more concerned about exceeding the RF Exposure limits with this arrangement. Perhaps the "Tuner issue" is an indication of such. From your description, at 100 watts you will likely be way outside of the FCC limits of safe RF Exposure. Now with that said, the amount of RF at the TUNE level is not such to confuse the tuner. However at 40+ watts the RF back into the system is more than the system can accurately handle. A bunch of #31 beads or #73 beads, where "bunch" = 50 pcs or more, on the feed line at the antenna feed point and again a bunch at the radio. This may help the radio and antenna problem associated with the auto tune routine. You may find the same treatment required on the DC power cable at the radio. 73 Bob, K4TAX >------------------------------ > >Message: 21 >Date: Sat, 30 Jan 2016 18:48:29 -0600 >From: Bob McGraw K4TAX <[email protected]> >To: [email protected] >Subject: Re: [Elecraft] KXAT100 "Hunting" >Message-ID: <[email protected]> >Content-Type: text/plain; charset=utf-8; format=flowed > > >Candidly, I would be more concerned about exceeding the RF Exposure >limits with this arrangement. Perhaps the "Tuner issue" is an >indication of such. From your description, at 100 watts you will likely >be way outside of the FCC limits of safe RF Exposure. > >Now with that said, the amount of RF at the TUNE level is not such to >confuse the tuner. However at 40+ watts the RF back into the system is >more than the system can accurately handle. A bunch of #31 beads or #73 >beads, where "bunch" = 50 pcs or more, on the feed line at the antenna >feed point and again a bunch at the radio. This may help the radio and >antenna problem associated with the auto tune routine. You may find the >same treatment required on the DC power cable at the radio. > >73 >Bob, K4TAX ______________________________________________________________ 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]
