Re Audio mixers that do exactly this are ubiquitous in aircraft. Aircraft intercoms came to mind for me as well. They are designed for carbon mics, and medium impedance headphones. I have matched them to more modern mics and phones in the past, so I know it is possible. There was a lot of information on them, spread out over several years, in Kit Planes Magazine, in the Aero 'Lectrics column written by fellow ham Jim Weir (can't remember his call). Jim's company, RST Engineering, used to sell an intercom as a kit. That would be a good solution. Try a Web search to see if they are still around.
Mark KE6BB -------- Original message -------- From: "Dauer, Edward" <eda...@law.du.edu> Date: 07/04/2015 4:01 PM (GMT-08:00) To: elecraft@mailman.qth.net Subject: [Elecraft] Audio Mixers Audio mixers that do exactly this are ubiquitous in aircraft. Many are now integrated into the Nav-Comms, others were integrated into audio panels along with the Marker Beacon receivers; but in the stripped-down GA trainers of 20 plus years ago we used to use portable units, measuring about 4 inches by 2 inches by 2 inches, powered by a 9 volt battery, and held onto the panel with adhesive-backed Velcro (the GA pilot's best friend.) They came in two-place, four place and six place. I’ll bet they are abundant on E-bay-type used equipment sites, since new avionics has the functions all built-in. Simple switches allowed communication just between pilots (so ATC couldn’t hear the CFI scaring the student), or between one pilot and ATC (so the student couldn’t hear the CFI asking ATC to scare the student), or both. The four-place and six-place allowed passengers to listen and talk with the pilots but not communicate with ATC (so the pilots could scare just them.) I don’t know if they would be compatible with modern amateur transceivers — but they used to be as common as dirt and cost about as much. Anyone looked into it? Ted, KN1CBR (and ex-CFI) >Message: 27 >Date: Fri, 3 Jul 2015 13:15:44 -0500 >From: David McAnally <david.mcana...@gmail.com> >To: K3 List <elecraft@mailman.qth.net> >Subject: Re: [Elecraft] Audio mixers >Message-ID: > <cakjwhqvuqepj0yn4na3ohg6jvkuner-mzyj8oftuqwud+rx...@mail.gmail.com> >Content-Type: text/plain; charset=UTF-8 > >This was something we wondered about during field day. A way for operator >and logger to speak to each other over the headsets, as well as listen to >the QSOs. Hearing both sides of the QSO was accomplished by using the >monitor feature on the K3. However, the operator and logger wanted to >communicate with each other sometimes as well. > >I added an external mixer ><http://www.amazon.com/dp/B000KIPT30/ref=pe_385040_30332190_TE_M3T1_ST1_dp >_1> >to allow TX monitor and RX audio to be sent to a video stream as well as >the headset for the logger. Combining mic audio from two headsets might be >a little more complicated, especially to be active during RX as well as >TX. > >David M. >WD5M > >On Fri, Jul 3, 2015 at 12:43 PM, Cady, Fred <fc...@ece.montana.edu> wrote: > >> Hi all, >> Happy 4th. >> I'd like to use an audio mixer to mix computer and mic audio plus have >> kind of an intercom between two operators wearing headphones. I know >>there >> are audio experts here so what suggestions might you have? >> Thanks and 73, >> Fred KE7X >> ______________________________________________________________ >> 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 david.mcana...@gmail.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 rv6am...@yahoo.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
