I think conducted measurements would not be helpful anyway, because in this
case the use of a conservative antenna gain value is required.
(see page 8 of 558074 D01 DTS Meas Guidance v01)
Kind regards
Rene
"Pawson, James"
<James.Pawson@ech
ostar.com> To
Sent by: "'Grace Lin'"
[email protected] <[email protected]>
cc
"[email protected]"
02/15/2012 08:59 <[email protected]>
PM Subject
RE: FCC - Intentional Radiators,
Restricted Bands and 960 MHz
Hi Grace,
That's a very useful document for measuring the RF path, thanks for the
info. The issue we have is that the RF path is not the only path for the
emissions at 960MHz from the equipment under test so measuring just the
conducted output into the antenna would not give the whole picture.
Thanks
James
From: Grace Lin [mailto:[email protected]]
Sent: 15 February 2012 12:42
To: Pawson, James
Cc: [email protected]
Subject: Re: FCC - Intentional Radiators, Restricted Bands and 960 MHz
James,
FCC published a new DTS procedure, FCC KDB 558074 D01 DTS Meas Guidance v01
, on January 18, 2012. If you are able to connect the antenna port of the
device under test to the instrument (spectrum analyzer, through attenuators
if needed), you may wish to use this procedure. FCC has done a great job
on this procedure (save engineers' time and have better repeatability).
If you need a sample test report using the FCC DTS procedure, DTS
Measurement , published March 23, 2005, you may wish to look the report
under FCC ID: EROCWD6660 or FCC ID: EROCWD6782. These two applications
were granted by the FCC. Conducted measurement was used to take -20dBc
data (screen captures).
With regards,
Grace Lin
On Wed, Feb 15, 2012 at 5:46 AM, Pawson, James <[email protected]>
wrote:
Bit of a regulatory puzzler here, please bear with me.
Testing an intentional radiator to FCC 15.247. Spurious emissions allowed
to be -20 dBc except in the 15.205 restricted bands where the general
radiated emissions limits in 15.209.
Radiated emissions limits: 216 ~ 960 MHz = 200 uV/m, 960 MHz upwards =
500 uV/m
The tighter (lower) limit applies at the band edges so at 960 MHz the
limit is 200 uV/m
Restricted Bands includes 960 MHz to 1240 MHz
I've drawn a picture to help explain --
http://thedatastream.4hv.org/data/fcc_15-247_960mhz_limit_line_question.gif
My question is - what is the limit at 960 MHz for spurious emissions from
an intentional radiator?
My interpretation (to the letter of part 15) is that for 960 MHz only,
the limit is 200 uV/m. However this doesn't follow a common sense
approach to the limits and restricted bands (the green limit line on the
picture).
We currently have an issue with a product with emissions around 960 MHz
that would cause it to fail the strict interpretation of the standard but
pass the "common sense approach" interpretation. So any assistance is
greatly appreciated :)
Thanks in advance
James
~~~~~~~~~~~~~~~~~~~~
James Pawson
Leading Hardware Engineer - EMC
EchoStar Europe
~~~~~~~~~~~~~~~~~~~~
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