Jim, everythingis okay with the hearing aids in my ears and I use an SP3 speaker, Sony earbuds, Apple earbuds, KOSS PRO headphones, Bose QC25 headsets, all without any issue. As soon as I put on the CM-500s the aids switch to magnetic input and work well until the RF is present.
The question was about the shielding in the Heil headset and not how to mitigate the RF. The levels are certainly high. I have learned that the Heil speaker elements are not shielded so I will not try them. Michael Blake k9...@mac.com > On Nov 2, 2018, at 20:39, Jim Brown <j...@audiosystemsgroup.com> wrote: > > Hi Michael, > > Are you sure it's the headphones? What sort of antenna are you using? The > current in an antenna creates a magnetic field that can be quite strong in > the near field. When I lived in Chicago, my best antenna for 80 and 160 was a > long wire that ended in the shack, and it had a current maxima at the > feedpoint (the shack). The field shut down the RS232 port in my computer > sending CW to my K2 using the standard K2 cable with as little as 12 watts! > That cable used parallel wires. I fixed the problem by replacing it with > CAT5, using one pair for each of the RS232 signalling ports. Twisted pairs > STRONGLY resist magnetic coupling. Once I did that, I could crank my Titan > power amp to near legal limit power. > > I'm not suggesting that twisted pair is a solution, but I am suggesting that, > depending on your antenna and its proximity to your aids, that field could be > getting directly into their pickup from your antenna! > > 73, Jim K9YC > >> On 11/2/2018 1:59 PM, Michael Blake via Elecraft wrote: >> When running more than 100 watts on 80 or 40 the RF causes the hearing aids >> to switch modes randomly when the telecoils are activated by a nearby >> magnetic field. > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to k9...@mac.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
