OK thanks Alan and Joe for suggestions. The computer is all plastic
construction so no obvious earth point and the existing USB leads have ferrite
clips at both ends. The same problem occurs with at least one other software
package but I'll try some additional ferrites/toroids and seek out a screened
cable as well.
Geoff
>
> On 03 July 2018 at 19:37 Alan Maenchen <ad6e@arrl.net> wrote:
>
> Geoff,
>
> I suspect that USB cable is inactive UNLESS you run WL or some other rig
> control software. That would explain the noise.
> Suggest adding several ferrites to the USB cable. Also, you might try to
> add good heavy grounding (bonding) between the computer chassis and the
> radio. I certainly can't explain why that wasn't a problem before your
> upgrade.
>
> GL & 73, Alan AD6E / KH6TU
>
> >
>
> > >
> > Message: 2
> > Date: Tue, 3 Jul 2018 16:34:21 +0100 (BST)
> > From: geoff plucknett <geoffg4fka@virginmedia.com>
> > To: Reflector Writelog <writelog@contesting.com>
> > Subject: [WriteLog] Generated noise
> > Message-ID: <585855656.1046415.1530632061867@mail2.virginmedia.com>
> > Content-Type: text/plain; charset=UTF-8
> >
> > I've only noticed this since updating to v12.29G in June. Computer
> > is
> > connected to IC-7610 via USB lead with everything set for COM3 and
> > 4 as
> > standard. When I bring up WL a load of hash noise of around S7
> > appears on
> > the receiver, specifically on 14 MHz but seems to cover at least 1
> > MHz
> > either side. The noise disappears when WL is switched off. Not
> > something
> > I've seen before. Any thoughts?
> >
> > Geoff G4FKA
> >
> > _______________________________________________
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> > WriteLog@contesting.com
> > http://lists.contesting.com/mailman/listinfo/writelog
> > WriteLog on the web: http://www.writelog.com/
> >
> > >
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