Michael / Bill,Really good points, thanks.One thought comes to mind; If the
module is for Dedicated Short Range Communication (DSRC) and installed in a
vehicle without it's own enclosure e.g. module board installed inside a vehicle
under the dash board, would the entire vehicle be considered an enclosure? My
thought is the dashboard could be considered an enclosure.
Regards,Stephen
On Wednesday, February 15, 2017 4:06 PM, Michael Derby
<[email protected]> wrote:
#yiv9629491881 #yiv9629491881 -- _filtered #yiv9629491881
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div.yiv9629491881WordSection1 {}#yiv9629491881 I would agree with Bill, that
the FCC is certainly moving in the direction of a more “holistic approach
toward the whole end product”, and less interested in the separation of the
component parts (component parts, in the sense of assessing operations
separately). I would suspect that if Bill were to submit a KDB, my guess is
that they will say “whole product”. We see it with things like the
clarification on spurious emissions testing of the unintentional emissions,
where the upper frequency range for Part 15B testing is based on the highest
frequency in the installed module. They’re looking more at the full picture
these days. Michael. From: Bill Stumpf [mailto:[email protected]]
Sent: 15 February 2017 19:28
To: [email protected]
Subject: Re: [PSES] Co-located modules I don't have any conclusively
documented evidence from the FCC. This supposition is taken from recent FCC
presentations, current KDB's and conversations with trusted "co-inhabitants" in
this industry. An example of this indication is provided below. It is from an
April 2015 FCC TCB Council presentation regarding KDB 551693 DR01. Real
purpose of no-collocation condition– Not to restrict device usage options–
Instead is to require compliance of multi-radio simultaneous transmission
operations within a single end product• In cases where that is not already
evaluated in the applications, or• For use outside parameters/scope for which
the device was already evaluated I know in the past we've referenced 20cm
as the minimum distance between antennas at which the FCC considered two
simultaneously transmitting transmitters to be collocated. Even that was
unwritten though. It would be nice to have a more clearly defined answer to
what is considered collocation for requiring FCC multi-transmitter product
procedures. Perhaps I will submit a KDB inquiry to the FCC... Bill From:
[email protected] [mailto:[email protected]]
Sent: Wednesday, February 15, 2017 11:33 AM
To: Bill Stumpf <[email protected]>
Cc: EMC-PSTC <[email protected]>
Subject: Re: [PSES] Co-located modules Bill -- This "in the same enclosure"
interpretation sounds new and drastic to me. Do you have any official
document/link on this interpretation? thanks Mike ShermanGraco Inc. From:
"Bill Stumpf" <[email protected]>
To: "EMC-PSTC" <[email protected]>
Sent: Wednesday, February 15, 2017 7:34:19 AM
Subject: Re: [PSES] Co-located modules The latest chatter I gathered on this
topic is that the FCC considers collocated as "in the same enclosure".
Indications are that any reference to <20cm being considered collocated has
been set aside. Bill From: Michael Derby [mailto:[email protected]]
Sent: Wednesday, February 15, 2017 2:18 AM
To: [email protected]
Subject: Re: [PSES] Co-located modules Hi Stephen, One thing to remember is
that “must not be co-located” really just means “must not be co-located without
some additional effort” For example, co-locating two modules and then
calculating the new combined RF Exposure MPE value to verify that the product
still meets the requirements, would be acceptable. It does not necessarily
mean a C2PC is needed, for example. I think you’re right that 20 cm is ‘good
guidance’ with regard to RF Exposure. But if your modules are 20.5cm apart,
you might still want to consider the overall compliance of that final product…
and a co-located MPE calculation is not too hard. Thanks, Michael. From:
Stephen Whalen [mailto:[email protected]]
Sent: 14 February 2017 23:34
To: [email protected]
Subject: [PSES] Co-located modules All,For a module that has "must not be
co-located" restriction on FCC grant. What is the minimum separation distance
allowed for another transmitter? I recall 20cm but can't find where it is
documented. Regards,Stephen-
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