n to keep Part 15
subpart B in title 47?
Ralph
-Original Message-
From: Ken Wyatt
Sent: November 21, 2024 4:41 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Emissions Class A vs Class B
Not to mention digital TV has error correction, making it much less
susceptible to EMI. Even
G
Subject: [EXTERNAL] Re: [PSES] Emissions Class A vs Class B
And some of us still have outdoor antennas 😉 Brent DeWitt, AB1LF On 11/21/2024
6: 19 PM, doug emcesd. com wrote: Hi Brent and the group, This brings back a
lot of memories. When I was at AT&T Bell Telephone Laboratories, back when
d
Given what has been discussed here, is there a reason to keep Part 15 subpart
B in title 47?
Ralph
-Original Message-
From: Ken Wyatt
Sent: November 21, 2024 4:41 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Emissions Class A vs Class B
Not to mention digital TV has error
Not to mention digital TV has error correction, making it much less susceptible
to EMI. Even OTA and satellite transmissions shouldn’t be affected.
Kenneth Wyatt
Windsor, CO
> On Nov 21, 2024, at 16:20, doug emcesd.com wrote:
>
> Although today interference to broadcast TV is not the problem
s of miles per year currently.
Doug
*From:*Brent DeWitt
*Sent:* Saturday, November 9, 2024 20:07
*To:* EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* Re: [PSES] Emissions Class A vs Class B
This is probably a bit of urban legend, but back in the 1970s, the
first exposure I got to commercial EMC was with res
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From: Jim Bacher, WB8VSU
Sent: Sunday, November 10, 2024 5:43
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Emissions Class A vs Class B
One of the issues that pushed the FCC forward was significant interference with
police and fire communications d
MeCe-BDC_BscJtSFgszSSjssihHS-pjM3-jwNP8S0CwE-gN8fsRsPkojiAlmpBwb20vIVizS-siCUywW_jqrefbVr]
From: Brent DeWitt
Sent: Saturday, November 9, 2024 20:07
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Emissions Class A vs Class B
This is probably a bit of urban legend, but back in the 1970s, the first
expo
Thanks for that Bob.
From: Sykes, Bob
Sent: November 11, 2024 2:26 PM
To: rmm.priv...@gmail.com; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [EXTERNAL] Re: [PSES] Emissions Class A vs Class B
The FCC IS involved in a lot more than licensing broadcast facilities and
protecting the radio
airman/Chairwoman.
Bob Sykes
(old enough to remember when FCC started regulating digital devices via docket
20780)
From: Ralph McDiarmid
Sent: Sunday, November 10, 2024 1:30 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [EXTERNAL] Re: [PSES] Emissions Class A vs Class B
As a sidebar to this discuss
But it was pretty neat to watch the VU meters “peg” when cranking up the power
amplifiers on our stereo systems.
Jim
From: Ralph McDiarmid
Sent: Sunday, November 10, 2024 1:45 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [EXTERNAL] Re: [PSES] Emissions Class A vs Class B
This message is from
The VU indicator is not fast enough even to be a 'quasi-peak' indicator,
so it misses signal peaks that would overload a disc-cutter or its disc,
or a magnetic tape. Professional recorder people learn how to overcome
that, but few consumers learn, of course. The PPM was specifically
designed to
From: Brent DeWitt
Sent: November 10, 2024 5:55 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Emissions Class A vs Class B
Again, I speak from urban legend:
My understanding is that the Quasi-Peak detector was based on the "VU meter",
common to audio recording, The i
Executive branch may be involved
to oversee that collection of administrative laws. Maybe someone on this forum
can clarify.
Ralph
From: Brent DeWitt
Sent: November 9, 2024 8:07 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Emissions Class A vs Class B
This is probabl
Again, I speak from urban legend:
My understanding is that the Quasi-Peak detector was based on the "VU
meter", common to audio recording, The idea was to approximate the the
_perceived _loudness to the human ear. For those haven't seen one, the
VU meter is also a fast attack, slow release dev
One of the issues that pushed the FCC forward was significant interference
with police and fire communications during emergency events in Los Vegas.
The interterence was due to the the new computer driven gaming machines.
That in the late 1970s.
I was told Quasi Peak is used, due to video nois
)"
*Reply-To: *"James Pawson (U3C)"
*Date: *Saturday, November 9, 2024 at 10:19 AM
*To: *
*Subject: *[PSES] Emissions Class A vs Class B
Hello all,
I’m writing some guidance on Class A vs Class B and I was thinking
about the Why. As in why do we separate emissions into Class A an
)"
*Date: *Saturday, November 9, 2024 at 10:19 AM
*To: *
*Subject: *[PSES] Emissions Class A vs Class B
Hello all,
I’m writing some guidance on Class A vs Class B and I was thinking
about the Why. As in why do we separate emissions into Class A and B?
Reasons I’ve heard (which make some kind
might share the same or a close-by branch circuit.
--
Ken Javor
Ph: (256) 650-5261
From: "James Pawson (U3C)"
Reply-To: "James Pawson (U3C)"
Date: Saturday, November 9, 2024 at 10:19 AM
To:
Subject: [PSES] Emissions Class A vs Class B
Hello all,
IEC 61000-2-5 was compiled from historical sources, so is reliable.
Regarding point a., there was an assumption that broadcast receivers
would be uncommon in the industrial environment. Note also that, because
of European language differences, 'industrial' in the context of
'Classes A and B' me
Hello all,
I'm writing some guidance on Class A vs Class B and I was thinking about the
Why. As in why do we separate emissions into Class A and B?
Reasons I've heard (which make some kind of sense even if I've not actually
looked into the figures) include:
a. Concentration of elec
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