[Elecraft] Fw: [K3] Hearing aids, meet K3

[Richard Fjeld]

I've been trying email clients, and had a cockpit error. I wanted to make a couple comments.  

First to Alan, N5ILN, I do have a copy of Schrader's 'Electronic Communications".  I agree.

Then, this story:
 I began using my laptop at my daughter's house. Pretty soon, people from all over the house, even from downstairs, converged on me asking why the laptop was making such a terrible screeching noise.  They couldn't tolerate it.  I wasn't hearing a thing.  I hit the mute button and they were happy again.  No hearing aids yet.

I wonder if that affects my preference for CW sidetone around 600 Hz.  I think that is normal??

Dick, n0ce

  ----- Original Message ----- 
  From: Jim Brown 
  To: elecraft at mailman.qth.net 
  Sent: Wednesday, August 07, 2013 4:23 AM
  Subject: Re: [Elecraft] [K3] Hearing aids, meet K3


  On 8/6/2013 8:45 PM, Don Wilhelm wrote:
  > I may b unique because my lower range hearing without the aids is 
  > normal, so I have built-in low pass filters in my ears.

  That's entirely normal, Don. In general, hearing loss starts at the high 
  end and moves down.  Many folks with a lot of hearing loss still hear a 
  lot of low end. The exception is when for one reason or another we are 
  exposed to strong noise at a specific frequencies, or a specific range 
  of frequencies, in which case we develop a notch in that range.

  The problem is that speech intelligibility depends on sounds in the 
  range of 500 Hz - 4 kHz, with the 2 kHz octave being most important, the 
  1 kHz octave close behind.  That's why telephones and ham radio, with 
  bandwidth limited to about 500 Hz to 3kHz,  work just fine. Energy above 
  4 kHz helps, but energy below about 350 Hz makes no contribution, and 
  often makes things worse.  The scientists at Bell Labs figured this 
  stuff out early in the 20th century.

  73, Jim K9YC
  ______________________________________________________________
  Elecraft mailing list
  Home: http://mailman.qth.net/mailman/listinfo/elecraft
  Help: http://mailman.qth.net/mmfaq.htm
  Post: mailto:Elecraft at mailman.qth.net

  This list hosted by: http://www.qsl.net
  Please help support this email list: http://www.qsl.net/donate.html