Radio Frequency Exposure Evaluation

[WQPT412]

Is there a more specific RF exposure  calculator for GMRS other than what the ARRL’s site has? 

[SteveShannon]

3 hours ago, mam123 said:

Is there a more specific RF exposure  calculator for GMRS other than what the ARRL’s site has? 

No.

You enter the frequency, power output, FM as mode type, whatever duty cycle is typical for your usage, and the gain of your antenna.  How would you want it to be more specific for GMRS?. 

http://arrl.org/rf-exposure-calculator

If you just want something different from ARRL, there’s this: 

http://hintlink.com/power_density.htm

I haven’t compared the results.

[WQPT412]

Thank you. 

[SteveShannon]

Users of Type 95 devices are not required to perform the evaluation for RF that are required for type 90 and 97 devices.  Type 95 devices aren’t even mentioned in the bulletin:

https://transition.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65.pdf

[WQPT412]

Okay. Thank you. 

[WQPT412]

7 hours ago, Sshannon said:

Users of Type 95 devices are not required to perform the evaluation for RF that are required for type 90 and 97 devices.  Type 95 devices aren’t even mentioned in the bulletin:

https://transition.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65.pdf

Okay. Thank you. 

[KAF6045]

On 7/8/2023 at 7:30 AM, Sshannon said:

Users of Type 95 devices are not required to perform the evaluation for RF that are required for type 90 and 97 devices.  Type 95 devices aren’t even mentioned in the bulletin:

https://transition.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65.pdf

Though I'd take into account the dates... 1997 probably goes back far enough that most "real" GMRS gear WAS Part 90 equipment, 20 years before the Part 95 rewrite by the FCC. I believe the FCC has also removed the "categorical exemption" clauses.

HTs fall into the SAR computation (antenna less than 8" from body) -- and that is complex enough (how much radiation does a <10cm /cube/ of flesh absorb) that it is basically up to the manufacturer to have the evaluation performed before offering the device for sale. Mobiles fall into MPE computation (antenna >8" away) and can be numerically modeled (see the ARRL RF exposure program). Mobiles -- used mobile -- are unlikely to have anyone from the general/uncontrolled population nearby for the averaging period used in the computations; that leaves the controlled population ("you" as the operator) with its averaging criteria.