[RFI] The FCC's Class B Standards
Dave Cole (NK7Z)
dave at nk7z.net
Wed Mar 21 02:54:01 EDT 2018
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 at nk7z.net
> <mailto:dave at 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 at pppl.gov <mailto:lhalvors at 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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