[hpsdr] Fwd: Hermes Ethernet

[Ray Page]

Get rid of the ribbon cable!  Also consider using clamp-on ferrite EMI
filters right at the connectors to kill the common-mode stuff.

Example:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=240-2070-ND

-Ray



On Thu, Aug 5, 2010 at 8:08 PM, Bob Campbell <joan-bob at bigpond.net.au>wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Mike, Dan, Rob, Lester and the list.
>
> Thanks for the replys.  I appreciate the feedback.  Well the two
> switches here are the 10Mb LanTech and 100Mb WireTek.
>
> Now some of the wiring is not exactly Cat5 so in the knowledge that we
> will be using the network with the future boards I think its a good time
> to chase these problems down a bit more and report back to the list.
>
> Some of the network wiring is ribbon cable and thus is not shielded or
> does much for common mode rejection.  So it should be interesting to
> play round with the various combination of switches and cabling to see
> if I can get rid of the problem and what causes the most spurious rf.
>
> More later..
>
> 73's
> Bob.c
> Vk4xv
>
>
>
> On Thu, 2010-08-05 at 07:56 -0400, AA8K73 GMail wrote:
> > LinkSys is notorious for noise.  Are you using LinkSys?
> >
> >
> > Bob Campbell wrote:
> > > ***** High Performance Software Defined Radio Discussion List *****
> > >
> > > Hi All,
> > >
> > > In my shack a significant producer of spurious signals into my HPSDR is
> > > my network.  Now I have never seriously chased them down but I suspect
> > > it the switches.  I have a 100Mb and 10Mb switches.
> > >
> > > Is it my cruddy install or are others seeing these as well?
> > >
> > > 73's
> > > Bob.c
> > > Vk4xv
> > >
> > >
>
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