Dashes, not minus signs?
dBuV is deciBels relative to a microvolt. A uV is very small voltage, 1 x 10^-6
Volts.
de Jim WB5WPA
On Saturday, August 3, 2019, 10:35:15 AM GMT-5, David Eckhardt
<davearea51a@gmail.com> wrote:
Picking only one frequency range (measurement distance is all 30m or
"corrected to 30 m)) RE:
Part 18 216 to 1000 MHz -23 dBµV/m
Part 15 216 to 960 MHz -41 dBµV/m
-23 dBµV is greater than -41 dBµV/m Therefore, Part 15 is more
restrictive than Part 18 for RE limits. Similar for CE.
Dave - W0LEV
On Sat, Aug 3, 2019 at 8:12 AM Hare, Ed W1RFI <w1rfi@arrl.org> wrote:
> Devices that operate above 9 kHz are regulated by the FCC.
>
>
> The definition of ISM in Part 18 explains why fluorescent RF-lighting
> devices are regulated as ISM devices:
>
> "(c) Industrial, scientific, and medical (ISM) equipment. Equipment or
> appliances designed to generate and use locally RF energy for industrial,
> scientific, medical, domestic or similar purposes, excluding applications
> in the field of telecommunication. Typical ISM applications are the
> production of physical, biological, or chemical effects such as heating,
> ionization of gases, mechanical vibrations, hair removal and acceleration
> of charged particles>."
>
> Here is a summary of the Part 18 vs Part 15 limits for consumer equipment:
>
> Conducted emissions:
>
> 0.009 to 2.51 MHz - Part 18 - 48 dBuV ("maximum")
> 2.51 to 3.0 MHz - Part 18 - 69.5 dBuV ("maximum")
> 3.0 to 30 MHz - Part 18 - 48 dBuV ("maximum)
> >30 MHz - Part 18 - none
> All ISM-band frequencies - Part 18 - none
>
> 0.009 - 0.15 MHz - Part 15 - none
> 0.15 to 0.5 MHz - Part 15 - 66 dBuV to 56 dBuV (q.p)
> 0.5 to 5.0 MHz - Part 15 - 56 dBuV (q.p)
> 5.0 to 30 MHz - Part 15 - 60 dBuV (q.p)
> Above 30 MHz - none
>
>
> Radated emissions:
>
> Below 30 MHz - Part 18 - none
> 30 - 88 MHz - Part 18 - 20 dBuV/m @ 30 m distance
> 88 - 216 MHz - Part 18 - 23.5 dBuV/m @ 30 m distance
> 216 - 1000 MHz - Part 18 - 26 dBuV/m @ 30 m distance
> Any ISM frequency - none
>
> Below 30 MHz - Part 15 - none
> 30 - 88 MHz - 34.3 dBuV/m corrected to 30 m distance
> 88-216 MHz - 38.8 dBuV/m corrected to 30 m distance
> 216 - 960 MHz - 41.7 dBuV/m corrected to 30 m distance
> Above 960 MHz - 44.8 dBuV/m corrected to 30 m distance
>
> After correcting for the distances for compliance specified in the rules,
> the Part 18 limits approximately 10 to 15 dB more stringent than the Part
> 15 limits, so I am not sure why some are claiming that the industry was a
> powerful lobby to get themselves regulated as an ISM device. Perhaps they
> can explain why they believe that manufacturers lobbied to get more
> stringent limits.
>
> Fluorescent lamps do not operate on any of the designated iSM frequencies
> that have no limits, so they must comply with the table above.
>
> Ed, W1RFI
> ARRL Lab
> ------------------------------
> *From:* RFI <rfi-bounces@contesting.com> on behalf of David Eckhardt <
> davearea51a@gmail.com>
> *Sent:* Friday, August 2, 2019 4:01:53 PM
> *To:* Gary Johnson <gwj@wb9jps.com>
> *Cc:* Rfi List <rfi@contesting.com>
> *Subject:* Re: [RFI] RFI Digest, Vol 199, Issue 3
>
> Thanks, Gary. I was not aware of the 8 kHz operation of the 'new'
> electronic ballasts. I still think its a stretch to place them under Part
> 18, but the FCC has ruled. The electronic ballast people must have a
> strong lobby. I give up.
>
> When we had this house designed and built out of the High Park Fire in 2012
> where we lost everything, I'm glad I specifically specified absolutely no
> LED's, no florescent lighting, no CFL lighting, and no (accessible)
> SMPS's. I won, but the new appliances are full of SMPS's not to mention a
> few touch panels. Over the five years we've been in this new house, I've
> managed to tame 'most' of the nasty little gremlins for radio astronomy and
> amateur radio. BUT........, when I really want to dig into the noise for
> radio astronomy, ALL PC's and laptops must be OFF.
>
> Enough.......... Read my 'rant' on my QRZ page (WØLEV) regarding the
> modern digital world and FCC (last paragraph of the QRZ page)..
>
> On Fri, Aug 2, 2019 at 7:43 PM Gary Johnson <gwj@wb9jps.com> wrote:
>
> > From the FCC site https://www.fcc.gov/oet/ea/rfdevice
> > ------------
> > INDUSTRIAL, SCIENTIFIC, AND MEDICAL EQUIPMENT (Part 18)
> >
> > When electronic-electrical products are used for providing RF energy for
> > other than telecommunications applications, such as for the production
> > of physical, biological, or chemical effects, such as heating,
> > ionization of gases, mechanical vibrations, and acceleration of charged
> > particles, these devices fall under the FCC rules 47 CFR Part 18.
> >
> > Examples include: fluorescent lighting, halogen ballasts, arc welders,
> > microwave ovens, and medical diathermy machines.
> > -------------
> > And it *is* RF because the newer switching ballasts ionize the gas above
> > 8 kHz, not 60 Hz. And they are absolutely hideous RFI generators...
> >
> > Dying a slow death from RFI,
> > Gary NA6O
> >
> > >
> > > Part 18 exclusively addresses ISM equipment: Industrial, Scientific,
> and
> > > Medical. As far as lighting is concerned, Part 18 specifically
> > addresses
> > > ONLY "*RF* LIGHTING" which is the only lighting option present in
> > Part 18.
> > > Certainly a florescent tube excited to emit light on 60-Hz is NOT
> "*RF*
> > > LIGHTING". I fail to comprehend how and why a florescent ballast
> would
> > > come under Part 18. Florescent lighting is not "*RF* LIGHTING".
> > Possibly
> > > a florescent tube excited to emit light by a Tesla Coil or a close-by
> AM
> > > broadcast tower (KOB AM in the North Valley of Albuquerque)
> would/might
> > > come under Part 18, but not standard home florescent lighting.
> > >
> > > Dave - W?LEV
> > >
> >
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >
>
>
> --
>
> *Dave - WØLEV*
> *Just Let Darwin Work*
> *Just Think*
> _______________________________________________
> RFI mailing list
> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
--
*Dave - WØLEV*
*Just Let Darwin Work*
*Just Think*
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