[RFI] Hum in Bose QC2 headphones

[Gary Smith]

Hi Dave,

No, these are stereo jacks, the K3 is a dual receiver radio with 
identical receivers which are a true diversity ensemble with one 
receiver using one antenna and the other receiver using a different 
one but simultaneously. (Check out the Jan 2009 QST). Having dual 
receivers is an option but I have all the options (It is an 
absolutely killer radio). FWIW, even when using the base K3 with none 
of the options, you use stereo headsets and there is an audio effects 
option you may select which sends the signals to each ear a bit out 
of phase. It's actually a plus in copying weak signals But the 
Diversity using my K9AY on one receiver and the Inverted L on the 
other is nothing short of magic.

Thanks for the thought though, I appreciate it.

Gary
KA1J

> Perhaps the radio is a mono output and the headphones are stereo...when used 
> with a mono jack you may be shorting one side to a ground loop... try 
> getting a mono to stereo converter jack.
> 
> 73,
> dave
> wa3gin
> ----- Original Message ----- 
> From: "Gary Smith" <Gary at doctorgary.net>
> To: <rfi at contesting.com>
> Sent: Tuesday, January 13, 2009 11:09 PM
> Subject: [RFI] Hum in Bose QC2 headphones
> 
> 
> > Though not a RFI issue, perhaps someone has the solution?
> >
> > When I connect my Bose QC2 noise cancelling headphones to my K3 I get
> > a hum which is only heard in the right headphone. It sounds like a 60
> > cycle hum and touching anything metal in any way connceted to the
> > radio resolves the problem completely.
> >
> >
> > I've turned off all the different pieces of gear associated with the
> > radio and I can get some reduction, just not an elimination of the
> > buzz. If I were to say attach a wire to my wrist while at the
> > station, it would be perfect. Of course that's not a good option for
> > several reasons but it does resolve the issue.
> >
> >
> > I remember this being an issue when I tried these with my laptop. The
> > headset works great with my MP3 player with no hum. The hum is only
> > when plugged in & when used strictly for noise cancelling, they work
> > great. These headphones are awesome for CW and I would like to find a
> > workable fix if possible.
> >
> > Idears?
> >
> > Thanks,
> >
> > Gary
> > KA1J
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> > 
> 
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