Hi everyone / Brian
I do not know if someone else may have added this and I missed in the thread so
apologies if redundant.
Brian, CFR Title 47 [Telecommunication Subchapter A] can be accessed online at
https://www.ecfr.gov/current/title-47/chapter-I/subchapter-A
Hope this helps if you need a copy in future!
Best to all
Mac Elliott
On Monday, July 10, 2023 at 11:13:39 AM EDT, David Schaefer
<[email protected]> wrote:
The basic unintentional limits in 15.109 are QP below 1 GHz and CISPR average
above 1 GHz, per 15.35.
Also, 15.35(b) specifies that peak values are limited to 20 dB above any
average limits (above or below 1 GHz) unless otherwise stated in the CFR.
Thanks,
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From: Chas Grasso [mailto:[email protected]]
Sent: Monday, July 10, 2023 9:55 AM
To: [email protected]
Subject: Re: [PSES] Fwd: [PSES] FCC Part B questions
CAUTION:This email originated from outside of Element Materials Technology. DO
NOT click links or open attachments unless you recognize the sender and know
the content is safe. Please contact IT Service Desk if you are in any doubt
about this email.
I can answer the first question:
A question came up that I can't answer w/o a copy of Part 47.
Does the FCC report require Quasi-Peak (QP) data, or just Avg and Peak. When
do peak readings trigger the need to report QP? I'm pretty sure Part 15 has
AVG and QP limits listed.
CHAS] The selection depends on the Freq band, So for example if testing
between 30MHz and 1GHz - the spec is stated AS XXdbuV/m at 3m using a QP
detector. Above
2G the spec is listed as AVG (with a max peak reading so technically both).
So..If the peak readings are BELOW the spec limits, its has been common to
state that the EUT is compliant. If on the other hand the peak readings EXCEED
the specs as stated then the QP/AVG data requirements kick in.
Next was what sort of margin is expected in order to pass CE emissions
requirements (CISPR 16 or 32)? Memory serves that one wants 3dB of margin, but
memories can be imperfect!
CHAS] I dont recall that there is a margin expectation in CISPR32 or in the FCC
Part 47 or in ANSI C63.4. What I DO remember is CISPR (Now EN) 22 (55022) that
required multi-sample testing if the original sample was within 3dB of the spec
so as to establish a statistical metric of the EMI performance of the EUT.
On Sat, Jul 8, 2023 at 8:24 AM John Woodgate <[email protected]> wrote:
This message originated outside of DISH and was sent by:[email protected]
======================================================================================
Best wishes John Woodgate OOO-Own Opinions Only
www.woodjohn.uk
Rayleigh, Essex UK
I hear, and I forget. I see, and I remember. I do, and I understand. Xunzi (340
- 245 BC)
-------- Forwarded Message --------
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Subject:
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Re: [PSES] FCC Part B questions
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Date:
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Sat, 8 Jul 2023 07:07:26 +0100
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From:
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John Woodgate <[email protected]>
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Organisation:
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J M Woodgate and Associates
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To:
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Brian Gregory <[email protected]>
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I can't answer your first question, but for the second question you should look
at EN 50715, which advises that you should determine the margin by applying
statistical methods to data obtained from measurements of similar products. It
isn't safe to assume 3 dB.
======================================================================================
Best wishes John Woodgate OOO-Own Opinions Only
www.woodjohn.uk
Rayleigh, Essex UK
I hear, and I forget. I see, and I remember. I do, and I understand. Xunzi (340
- 245 BC)
On 2023-07-08 05:38, Brian Gregory wrote:
Hi there,
A question came up that I can't answer w/o a copy of Part 47.
Does the FCC report require Quasi-Peak (QP) data, or just Avg and Peak. When
do peak readings trigger the need to report QP? I'm pretty sure Part 15 has
AVG and QP limits listed.
Next was what sort of margin is expected in order to pass CE emissions
requirements (CISPR 16 or 32)? Memory serves that one wants 3dB of margin, but
memories can be imperfect!
"Colorado" Brian
720-450-4933
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