[Elecraft] Possible phase noise question...

[David Cole]

Hi Joe,
The fellow is aware it is something on his end... I have been trying to
pin it to something on my end, and just can't...  We have known each
other for years and are on good enough terms that we can talk about it
with zero issues...  He is pretty sure it is the sound card as well...
We are just trying to devise tests to eliminate that.  He as a second
Signalink to test with, so that is the next step.  He will get a powered
USB hub shortly...  More as I get it...
  
-- 
Thanks and 73's,
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On Tue, 2014-07-01 at 10:34 -0400, Joe Subich, W4TV wrote:
> While I hate to point fingers in this situation, the symptoms are
> that of an unstable (noisy) sound card.  Given the documentation
> of insufficient filtering, regulation and bypassing in that
> particular device, a noisy USB power line (remember the computer
> power supplies are switchers with the potential for broadband
> hash) would directly modulate the codec (DAC), and the op-amp
> audio stages feeding the transmitter.
> 
> 73,
> 
>     ... Joe, W4TV
> 
> 
> On 2014-07-01 10:11 AM, David Cole wrote:
> > Hi,
> >
> > We are starting to focus on the Signalink soundcard itself...  I can't
> > imagine it is the Elecraft K3 failing, as a dead carrier does not cause
> > the spray, only when audio is being supplied to the transmitter, and
> > only when from the Signalink, does the problem happen...
> >
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