From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [LML] Re: Question for the electronics folks out there
To: lml
Date: Mon, 07 Mar 2005 13:33:45 -0500
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Posted for Steve Reeves <sreeves@sc.rr.com>:

  I too had to use an impedance transformer on mine.  I installed a Sony CD /
MP3 player in my Glasair. I also had to replace my intercom with a PM3000
stereo unit *AND* had to change my headset jacks (inputs) to stereo as well.
  Don't forget this part if you have been running mono (as I had been).  When 
I
recently wired up my Trafficscope VRX to the intercom, there were no problems
with audio whatsoever due to it being impedance matched (the unit could be
jumped to 300 or 600).
  
  Steve Reeves
  Glasair 343ND
  
  
  At 12:09 PM 3/7/2005, you wrote:


>I wired in my music input/output to my intercom today. I plugged in my MP3 
>player and it worked fine--except---the only volume control is on the MP3 
>player. The intercom volume control is separate and for voice only. Now the 
>question. The volume from the player isn't really sufficient. Not bad when on 
>the ground and everything is quiet but not nearly loud enough to hear well 
>when in flight. Suggestions?
>
>Greg,
>
>Most aviation audio inputs are 600 ohms while most modern device headset or 
>line outputs are for 4 or 8 ohms.  If your intercom is modern enough to have 
>stereo inputs, check the specifications documentation.  If you are using an 
>aviation input, it will expect the higher impedance.