The other issue is that, just because the FCC may consider collocated as being 
antennas in the same unit, does not affect the 20 cm rf exposure requirement 
for rf exposure in a mobile configuration.  I am not, however, that the FCC 
only considers collocation as stated.  For example, transmitter, other than 
part 15, that have multiple antenna placement using external antennas are still 
referred to this as collocation of antenna.  So, while the FCC may consider 
part 15 device antenna collocation as antennas in the same device, it may not 
hold true for other rule parts.

Thanks 

 

​​​​​

Dennis Ward

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From: Bill Stumpf [mailto:[email protected]] 
Sent: Wednesday, February 15, 2017 5:34 AM
To: [email protected]
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] <mailto:[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] <mailto:[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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