[RFI] FCC Complaint Filing
dave at nk7z.net
Sat Nov 23 18:56:36 EST 2019
The slides were not attached, can you send them directly to me please, I
would like to see your presentation.
73, and thanks,
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 11/23/19 3:27 PM, David Eckhardt wrote:
> "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 at 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 at contesting.com
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