[RFI] Hum in Bose QC2 headphones

[Tim Duffy K3LR]

This is how we adapted the Heil mic to the QC-1 and QC-2. The same procedure
works on both models.

http://www.freewebs.com/k1dg/boseheadphonemod.htm

The Bose phones are really worth it. They are the best we have found so far.

73,
Tim K3LR


-----Original Message-----
From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
Behalf Of David Jordan
Sent: Wednesday, January 14, 2009 11:32 AM
To: 'Gary Smith'; Gary at doctorgary.net; Rfi at contesting.com
Subject: Re: [RFI] Hum in Bose QC2 headphones

I love mine...we operate field day from a bus with a 20kw generator and
several overhead AC units...can't hear any of it with the head phones turned
on...comfortable too.

Enjoy,
Dave
Wa3gin

p.s. pics of the bus at www.w4ava.org click Field Day


-----Original Message-----
From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
Behalf Of Gary Smith
Sent: Wednesday, January 14, 2009 11:43 AM
To: Gary at doctorgary.net; Rfi at contesting.com
Subject: Re: [RFI] Hum in Bose QC2 headphones

>From the other Gary Smith.
Are those Bose headphones *really* worth that kind of money?  Have seen
their ads, just curious if they are that much better in service on a HF rig
than other brands.
73,
Gary...wa6fgi

  ----- Original Message ----- 
  From: Gary Smith 
  To: Rfi at contesting.com 
  Sent: Wednesday, January 14, 2009 6:32 AM
  Subject: Re: [RFI] Hum in Bose QC2 headphones


  > Are you certain that both ends of the cable are plugged 
  > in securely? I've heard the symptoms you described when
  > the plug on the headphone wasn't fully seated. Please
  > let us know what you find.
  > 
  > 73
  > 
  > -Kirk  K4RO

  Hi Kirk,

  Indeed they are all the way in on both ends & that pesky hum remains. 
  While assuring they are seated well I tried something, which was to 
  have the headphones on and the stereo plug unplugged at the distal 
  end.

  When not connected there was no hum but when I touched the bare end 
  of the plug to the equipment ground the right sided hum showed up. 
  Nothing surprising here but the same hum showed up regardless of 
  which terminal was touched to ground be it tip, ring or ground.

  Interestingly if I touch the bare connector with my fingers, there is 
  no hum whatsoever.

  The plot sickens

  Gary
  KA1J
  _______________________________________________
  RFI mailing list
  RFI at contesting.com
  http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI at contesting.com
http://lists.contesting.com/mailman/listinfo/rfi

_______________________________________________
RFI mailing list
RFI at contesting.com
http://lists.contesting.com/mailman/listinfo/rfi