I couldn't agree with you more. 30 dBuV is a rather strong signal. And,
yes, the LISNs do not represent real world conditions, but at least they
are a standard with to measure. There is a LOT I do not agree with from a
technical standpoint with the prescribed setups for both RE and CE, but I
refuse(ed) to sit on committees where politics rule over physics. And I'm
too old and crotchety to do so now.
Dave
On Sun, Nov 24, 2019 at 12:08 AM Dan K2YWE <dan.k2ywe@gmail.com> wrote:
> From my long but now somewhat ancient experience, a major problem with
> regulating conducted emissions is that compliance is measured under very
> specific conditions using line stabilization networks which may not have
> much relevance to the real world environment in which they will be used.
> Devices may be compliant but still cause havoc.
>
> On Sat, Nov 23, 2019, 6:56 PM Dave Cole <dave@nk7z.net> wrote:
>
> > Dave,
> > The slides were not attached, can you send them directly to me please, I
> > would like to see your presentation.
> >
> > 73, and thanks,
> > Dave (NK7Z)
> > https://www.nk7z.net
> > ARRL Volunteer Examiner
> > ARRL Technical Specialist
> > ARRL Asst. Director, NW Division, Technical Resources
> >
> > On 11/23/19 3:27 PM, David Eckhardt wrote:
> > > Quate:
> > > "cable shields are improperly terminated to the circuit
> board
> > > rather than to the shielding enclosure."
> > >
> > > This is the NUMBER ONE error the latest crop of designers make. The
> best
> > > way to violate the Faraday Cage they believe they have (had). In so
> > doing,
> > > THEY'VE VIOLATED MR. FARADAY ! ! !
> > >
> > > If the neighbor is causing interference, it is radiated from the
> > neighbor's
> > > house wiring into the ham's antenna. This is especially true if the
> > > source is blocks away. However, within the house, yes, the problem is
> > > conducted 'emissions'. Attached are thre slides I did for a course I
> > once
> > > offered. Have a look at the enclosure.
> > >
> > > Dave - WØLEV
> > >
> > > On Sat, Nov 23, 2019 at 7:13 PM Jim Brown <jim@audiosystemsgroup.com>
> > wrote:
> > >
> > >> On 11/23/2019 9:18 AM, David Eckhardt wrote:
> > >>> Radiated emissions (typically what causes hams interference) is
> > regulated
> > >>> and levels specified only at and above 30 MHz. Below 30 MHz, 150 kHz
> > >>> through 29.99999.... MHz, conducted energy is specified and measured.
> > >>
> > >> This is NOT correct. CONDUCTED emissions are the primary cause of RFI
> at
> > >> all frequencies, but especially below 30 MHz, through a mechanism
> first
> > >> identified in the world of pro audio as "The Pin One Problem," whereby
> > >> cable shields are improperly terminated to the circuit board rather
> than
> > >> to the shielding enclosure. The same error is also quite common with
> the
> > >> Green Wire for power wiring.
> > >>
> > >> Detail on this at k9yc.com/publish.htm
> > >>
> > >> 73, Jim K9YC
> > >> _______________________________________________
> > >> RFI mailing list
> > >> RFI@contesting.com
> > >> http://lists.contesting.com/mailman/listinfo/rfi
> > >>
> > >
> > >
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >
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--
*Dave - WØLEV*
*Just Let Darwin Work*
*Just Think*
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