Hi Charles, I hope you are well.

 

When performing your 15.109 emissions (part 15 subpart B) on the digital
device part of the product, you should have the transmitter part active
(powered) but it does not need to be transmitting.   Receiver mode would be
nice, or active scanning, or something like that.

You then test your unintentional radiator emissions from the whole product,
to Part 15.109, with module powered but not transmitting.

Remember that your module may now become the highest frequency item in your
product, so consider that when figuring out which frequency to test to.

(e.g., if you installed a 5.85 GHz WLAN, then your 15.109 emissions need to
be done up to ?29.25 GHz).

If you see emissions exceeding the limit which are from the digital device
operation of any part of your product (host or module), it is a fail.

 

Then, with your module transmitting, you need to perform the checks to
ensure that the final product meets the transmitter spurious emissions
tests/limits of 15.407.

If you see emissions exceeding the limit which are from the transmitter part
of your product, or a result of the interaction between transmitter and
host, it is a fail.

 

If you see a fail, fix it, get it passing, sell it, get rich, retire.   I
think that's the plan, at least.

 

 

Thanks,

 

Michael.

 

 

Michael Derby 

Senior Regulatory Engineer 

Director 

ACB Europe 

 

Certification Resource for the Wireless Industry 

Web:        <http://www.acbcert.com/> www.acbcert.com 

  

e-mail:     <mailto:micha...@acbcert.com> micha...@acbcert.com 

Mobile phone:   (+44) 7939 880829   (UK area code) 

Corporate office phone:     USA:   (+1) 703 847 4700 

 

 

 

 

From: Grasso, Charles <charles.gra...@dish.com> 
Sent: 20 November 2019 17:38
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Question on 15.407 spurious emissions testing method
enforcement

 

EMC Gurus,

 

According to KDB789033 (Note3) : After January 01, 2019 all emissions are
required to meet the limits as specified in the rules and it will not be
sufficient to 

show compliance to the limits specified in Section 15.209.  [This means
that, for Bands 1, 2a, and 2c, there is ONLY a Peak limit for spurious
radiated emissions 

that are outside of the restricted bands (-27 dBm/MHz, or 68.2 dBuV/m @ 3m).
[There is no Average limit for these spurs that are not in restricted
bands.]

 

Question: Based on the modular method for applying FCC regulations it is my
understanding that a radio should be tested to compliance for limits as
specified in Sections 15.407(b)(1-3)
BUT then (even with the radio on) the digital portion of an EUT needs to
show compliance to only 15.109? In other words, when testing the digital
portion of a radio
*any* radio spurious emissions that exceed the 109 limits can be ignored?

 

Am I wrong?

 

Thanks!

 

Charles Grasso

(w) 303-706-5467

(c) 303-204-2974

 

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