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
|