[Elecraft] Audio Mixers

[Dauer, Edward]

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.mcanally at gmail.com>
>To: K3 List <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] Audio mixers
>Message-ID:
>	<CAKjWhqvuqePJ0yn4nA3oHg6JvkUNER-MZYj8oftuqwuD+RxysA at 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 <fcady at 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
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