Re: Radiated EMI for ITE with Wireless

emc-p...@ieee.org Thu, 22 Jul 2010 14:56:37 -0400

Tim,
 
Here is FCC's response to the question:
 
"
Inquiry:


For a class B digital device, with clocks/oscillators below 108 MHz, that
incorporates an FCC certified 2.4GHz spread spectrum transmitter module, how
high in frequency should this device be tested, 1GHz or the fifth harmonics of
2.4GHz?

Response: 


When a transmitter certified as a module is used within a host, the host
testing  for Part 15B should treat the transmitter  as establishing the
highest frequency used in the device (@ 2.4) and under 15.33  (b) (1)  use the
5th harmonic. 
"


I hope this helps.

 

With regards,

Grace

On Tue, Jul 13, 2010 at 10:14 PM, <emcp...@aol.com> wrote:


        
        Hello,
         
        I have a class B digital device that incorporates a wireless module.  
Other
than the 2.4 GHz bluetooth, the rest of the device has a maximum oscillator of
16 MHz. The bluetooth part is already approved with a modular approval so I'm
not concerned about the intentional radiator part.
         
        I'm only doing the regular unintentional radiator portion for FCC and CE
(CISPR 22). The question is how high in frequency should this device be
tested? Does the bluetooth count toward the highest clock even though it is
already approved? All other clocks/oscillators are well below the 108 MHz
cutoff for testing above 1 GHz.
         
        Thanks
        Tim Pierce
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This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. To post a message to the list, send your e-mail to
<emc-p...@ieee.org>

All emc-pstc postings are archived and searchable on the web at
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Graphics (in well-used formats), large files, etc. can be posted to that URL. 

Website: http://www.ieee-pses.org/
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html 

For help, send mail to the list administrators:
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Re: Radiated EMI for ITE with Wireless

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