I don't know why, but that bothers me, and it seems like a lessening of
the rules, as opposed to what I think should be a tightening of the rules...
73s and thanks,
Dave
NK7Z
https://www.nk7z.net
On 03/20/2018 07:45 PM, David Eckhardt wrote:
Yep. Correct. Only in the User's Manual.
On Wed, Mar 21, 2018 at 1:10 AM, Dave Cole (NK7Z) <dave@nk7z.net
<mailto:dave@nk7z.net>> wrote:
Thanks for the info Dave... I saw, or heard someplace that the FCC
no longer requires a mark on the device, but just in the book...
Have you heard anything about this? I can't remember where I heard it.
73s and thanks,
Dave
NK7Z
https://www.nk7z.net
On 03/20/2018 01:25 PM, David Eckhardt wrote:
Only the FCC logo is REQUIRED to be on the device if it is Class
B, home
and small office. The statement and other regulatory
information, more
times than not, is contained in the 'User's Manual'. Most have a
regulatory section devoted to this kind of stuff. If there is
no FCC logo
on the product, assume it is either Class A (Industrial) or the
supplier
doesn't know much about the regulatory world and required
markings (no
attehtion to EMC/RFI). This is based on some 30 years of doing
EMC/RFI for
a living. What I write is from experience. When we had a real
FCC, things
were very different!!!!
If it is from China or the PacRim, just assume it has not been
tested nor
any attention paid to EMC/RFI. I have read
many,.....many,.....bogus
'reports' on Chinese products, many of which are assembled from
other
products and piece mealed from other reports and really don't
even apply.
I've also experiencef many, . . . . many, . . . . . instances
of false
labeling from China.
Bottom line: 1) When you shop for something, take a battery
operated
radio with you and request a test of the item.
2) It's hard to find otherwise, but don't
buy if the
electronics or products are 'Made in China".
3) Don't buy if in the inttruction manual
or posted on
the product, "Made of Foreign and Domestic Parts". That's a
license for Chinese switchers with,
again, no
attentioin paid to EMC/RFI.
However, the biggies like Apple and the like know the game and
are usually
to be trusted (except for their wall warts).
I realize all this reads rather negative, but its reality these
days! Just
believe me ! ! !
Dave - WØLEV
On Tue, Mar 20, 2018 at 7:40 PM, Leonard Halvorsen
<lhalvors@pppl.gov <mailto:lhalvors@pppl.gov>>
wrote:
Has everyone come to the same conclusion...
"*...**IF* you can find them." ???
[RFI] LED Bulb noise Eleta E12
I read a while ago that to avoid, or at least mitigate to
great extent,
interference, an RF noise source must meet FCC standards for
a "Class B"
device. What I read stated it was defined in Part 17 (it
seems to be Part
15 instead; possibly a typo) of the FCC rules, but I found
many references
to it in this *official* 120-page pdf document
<https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=
<https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=>
0ahUKEwjgprG4lLPZAhVHulMKHQF5AQQQFggoMAA&url=https%3A%2F%
2Fwww.gpo.gov
<http://2Fwww.gpo.gov>%2Ffdsys%2Fpkg%2FCFR-2009-title47-vol1%2Fpdf%
2FCFR-2009-title47-vol1-part15.pdf&usg=AOvVaw1Op9mrNNvD_YdVp_5mAmKU>.
This passage on page 23 states what manufacturers must put
on such
devices..
(b) For a Class B digital device or peripheral,
the instructions furnished the
user shall include the following or
similar statement, placed in a prominent
location in the text of the manual:
NOTE: This equipment has been tested and
found to comply with the limits for a Class
B digital device, pursuant to part 15 of the
FCC Rules. These limits are designed to provide
reasonable protection against harmful
interference in a residential installation.
This equipment generates, uses and can radiate
radio frequency energy and, if not installed
and used in accordance with the instructions,
may cause harmful interference
to radio communications. However, there is
no guarantee that interference will not occur
in a particular installation. If this equipment
does cause harmful interference to
radio or television reception, which can be
determined by turning the equipment off and
on, the user is encouraged to try to correct
the interference by one or more of the following
measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment
and receiver.
—Connect the equipment into an outlet on a
circuit different from that to which the receiver
is connected.
—Consult the dealer or an experienced radio/
TV technician for help.
I tried to locate devices that adhered to this at places
like Home Depot
and Lowes, but was unsuccessful.
This 7-page pdf document
<https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=
<https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=>
0ahUKEwjSsf7jl7PZAhWStlkKHQtWCB0QFggyMAA&url=https%3A%2F%
2Fwww.cableorganizer.com
<http://2Fwww.cableorganizer.com>%2Fimages%2Fkensington%
2Fmicrosaver-alarm-lock%2FFCC-rules.pdf&usg=AOvVaw2kXOZ71VpqTqByfN3bb6HO>
attempts to abbreviate and interpret the legalese above.
In it is this
passage on page two...
Two levels of radiation and conducted emissions limits for
unintentional
radiators are specified in FCC Part 15 Subpart B.
The two levels are Class A digital devices, the higher less
strict limits,
and Class B digital devices, the lower more strict limits.
Manufacturers are encouraged to meet the Class B digital
device limits.
So, *the key* seems to be to find devices that meet "Class
B" standards ...
*IF* you can find them.
If they are made someplace in the Far East, that is
probably impossible.
Compliance costs are probably too high, and most people
probably don't
care.
And if you can find them, they are probably expensive.
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*Dave - WØLEV
*
*/Just Let Darwin Work/*
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