[Elecraft] Possible phase noise question...

David Cole dave at nk7z.net
Tue Jul 1 10:11:45 EDT 2014


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...

-- 
Thanks and 73's,
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On Tue, 2014-07-01 at 14:49 +0100, Ian White wrote:
> >
> >That indicates to me that your soundcard ADC is being overdriven, or
> >that you have a bad soundcard.
> >
> >73,
> >Don W3FPR
> >
> 
> The sound card could also be overdriven if another unrelated program has
> changed the settings.
> 
> 
> 73 from Ian GM3SEK
> 
> 
> 
>  
> >-----Original Message-----
> >On 7/1/2014 1:02 AM, David Cole wrote:
> >> Here is a bit more info on the issue...
> >>
> >> If my friend moves his frequency just out of the radio passband, as
> >> shown on the P3, the problem go away...  The base noise level drops
> back
> >> down to normal...  Only when his signal is within the passband as
> shown
> >> on the P3 does the base noise level rise...  I also narrowed the
> filter
> >> down to eliminate his signal, and as soon as his signal movers out of
> >> the pass band, the problem ends...
> >>
> >> Is it just that the K3 is not dealing with his signal levels?  This
> >> happens when he is running 5 Watts, and he is 1/2 mile from me...
> >>
> >
> 



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