Technical Coordinator
Jeff Kopcak, K8JTK
The new FCC exposure requirements. Maybe you’ve heard about them. Maybe not. Maybe wondering how they
apply to your station. The FCC Report and Order does not change RF Exposure (RFE) limits but does require all
services, including amateur radio, to evaluate limits or take the exemption. There’s probably a lot I don’t
understand.
With respect to those much smarter than myself, I’ll try my best to explain this but I’m probably going to get
some stuff wrong. In addition to covering reasons for these changes and what they mean to most hams, I’ll
walk through an exception calculation. Those are easiest and likely the only calculation a ham might need to
perform in most cases.
In 2019, the FCC adopted new rules to limit human exposure to radio frequency energy. These rules went into
effect on May 3rd, 2021. Not much changed in these new rules except that Amateur Radio is no longer
categorically excluded from performing these evaluations to demonstrate compliance. Previously, only when a
station exceeded certain power limits was an evaluation required. For the most part, operating barefoot on HF
(without an amplifier, typically 100 watts or less) or operating most dual band radios with 50 watts or less, all
were categorically exempt. The second exclusion, no mobile stations had to perform these evaluations. Both
exclusions are now removed, gone. Exclusions are replaced with the exemption.
Removing the amateur radio exclusions means hams are now required to perform evaluations in
all cases. But! You do not submit anything to the FCC. Do the evaluation, print out/save results
or put notes on paper – they are to be kept with each station’s records. These records would be
used in a situation where a complaint is filed with the FCC against your station. Such as:
neighbor doesn’t care for your tower/antenna. Writes the FCC saying their family is subject to
harmful radiation. The FCC takes those complains fairly seriously and will come knocking for
an inspection (which they can - and will do. See 97.103, (a) and (c) specifically). The
representative may ask for this evaluation. They will implicitly trust the results if they appear to
be correct and the station is otherwise compliant. This is the self-regulation abilities we are
allotted by the FCC. The FCC will inform the neighbor, based on evaluation of the station, it was
found to be compliant and they have nothing to worry about. Another scenario maybe a building
permit is sought in order to erect a tower. The entity that grants the permit might ask to have an
evaluation completed.
In any case, each amateur station certifies, on their 605 form, they will comply with
Radiofrequency Radiation Safety. Licensed hams are considered trained in safety by way of
passing the license exam. Completing an RF safety evaluation does not exempt any station from
being otherwise compliant and responsible. If a station is transmitting, someone comes up and
touches the antenna, the station operating the equipment is still responsible.
If you were one that completed an evaluation under the old rules, that evaluation is still valid
until 2023. You have 2 years to complete an evaluation under the new rules. Every station (not
grandfathered under the old rules) must complete an evaluation after May 3, 2021 – including
new stations or when any significant changes are made to an existing. Changes would include an
increase in power, better antenna, better coax, moving the antenna closer to areas occupied by
humans. HTs manufactured before May 3, 2021 are grandfathered – no evaluation needed ever.
HTs manufactured after May 3, a SAR (Specific Absorption Rate) evaluation is performed by the
manufacturer.
The exemption calculation is a formula which indicates if the antenna is compliant or more
evaluation is needed. Exemptions require less calculations than a full exposure analysis.
Exemptions cannot be taken with in the reactive nearfield. Distance to a person is important.
Any transmitter within 20 cm (7.87 inches) of the body is considered in the nearfield and requires
a SAR evaluation. Nearfield also varies with frequency.
The HT falls into this weird area because they are almost always used within 7.87 inches of the
body. At this time, the methods for completing an evaluation are not clear for a few reasons: 1)
above 300 MHz is not really measurable, which only affects 2-meter handhelds. 2) SAR
evaluations are very costly and require specially calibrated equipment. 3) absorption inside the
body is very hard to measure. Cell phone manufactures have to complete SAR evaluations for
every handset and antenna configuration. To add insult-to-injury, a SAR would have to be
completed in each position of the radio. That is to say holding the radio straight up, slight angle,
talking across the microphone, holding the radio with the right hand, left hand, and so on. Chaching! Not so
fast. Radio manufactures will be responsible for performing this SAR evaluation.
In the evaluation, they will likely use the stock rubber duck antenna provided with the radio. If
you change the antenna (as most of us do) with a 3rd party or aftermarket, that means all
evaluations need to be performed using the new configuration. This is an area the ARRL is still
working out with the FCC for clarification. Right now, your HT is OK. Will manufacturers pass
on the cost to the consumer? Unknown for sure but very likely.
Don’t forget these evaluations need to be performed at field day sites, repeater sites, and beacon
locations. Field day sites may need restrictions placed on frequency or power allowed to meet
the requirements. Adjustments to antennas maybe needed, adding time to the field day setup.
In places where SAR is performed, an MPE (Maximum Permissible Exposure) chart displays the
amount of energy which should not be exceeded at different frequencies. There are two different
categories: occupational/controlled exposure (hams and their families) at 6-minute average and general
population/uncontrolled (everyone else, such as neighbors) with a 30-minute average. MPE is lowest
between 30 MHz and 300 MHz because those frequencies are easily absorbed by the human body.
Say we have a station with a multiband antenna (20- 10 meters) with 0 dbd of gain (manufacturer specs).
There is a sidewalk 15 feet (5 meters) away (closest human exposure to radiation) from the antenna. The
transmitter outputs 100 watts into 50 feet of RG-58.
The highest frequency in operation is 29.70 MHz. 50 feet of RG-58 at 29.7 MHz is rated at 1db of loss (mfr
specs), which is 22% (find a gain/loss table or calculator for this percentage).
First, are people within the distances (antenna to human) in the table below for near field
exposure?
Nearest person would be 15 feet away and lowest band we plan to operate is the 20-meter band
since the antenna is capable. No, humans are not within the reactive nearfield (10.3 feet). We
can continue with the exemption calculation. If humans are within the nearfield, a full evaluation
needs to be completed.
Next, calculate the maximum ERP. For a multiband antenna, ERP decreases at higher frequencies so you only
need to calculate at the highest frequency the station plans to use. 10 meters in this case.
3450 R2/f2 = Maximum ERP (formula for the range 1.34-30 MHz)
3450 x (5 meters)2/ (29.7 MHz)2 = 97.8 watts maximum ERP
Calculate the station’s ERP:
(Transmitter power – Feedline loss) x Antenna gain = ERP
(100W – 22W) x 1.0 = 78 Watts ERP
To compare, 78 watts is less than 97.8 watts. This antenna qualifies for an exception!
What happens if the station cannot take the exception? If you never transmit 29.7 MHz and only plan to use
lower frequencies, calculate at the lower frequency. Move the antenna further away from the sidewalk. Or
perform a full evaluation. The exemption numbers are verrry conservative numbers and conservatively safe. If
actual exposure is calculated on the sidewalk, it will be less than the exception calculation. Averaging time is not
taken into account. If the station talks for 15 minutes and listens for another 15 minutes, the
exposure is halved. Areas like a sidewalk, people are likely to be there for only a few seconds at
a time.
Online calculators are a huge help in performing power density estimations. VP9KF’s calculator
performs MPE calculations. The Lake Washington Ham Club site calculates MPE by taking into
account transmitter duty cycle. It will provide minimum safe distance to the antenna.
To perform a full analysis, the FCC aid for evaluating human exposure is OET Bulletin 65 and
OET Bulletin 65 supplement B. The no-longer-in-print book by Ed Hare – W1RFI is available
for download as a PDF. Modeling software is available for free or little cost. One such modeling
application is EZNEC. The ARRL is working on finding or developing tools for all hams to use.
Those can be found at: http://www.arrl.org/rf-exposure and the ARRL Technical Information
Service is a member benefit that can provide more information. Finally, Greg – N9GL, Chairman
of the ARRL RF Safety committee, gave a very informative presentation on these changes. It
runs 2 hours with Q&A. Ria – N2RJ, director of the ARRL Hudson Division, has a YouTube
channel with a video on this topic. The majority of the information in this article came from both
videos, thanks to both Greg and Ria.
Recent FCC NPRM’s have put ham radio use of the 5GHz band at risk. These frequencies are
utilized for things like mesh networking. Who wants to take away these allocations?
Commercial interests to push the 5G mobile standard. These same interests have already taken
part of the 3 GHz WiFi band. ARDEN Mesh is fighting back, legally, against repurposing these
allocations. If you have 5 GHz AREDN mesh nodes in the lower 45 – 5.850-5.895 GHz or upper
30 – 5.895-5.925 GHz channels, please take the time to read and respond to their solicitation for
information.
Another huge thank you to the West Chester Amateur Radio Association - WC8VOA, which I’m
also a member, for having me as the presenter at their May 6th meeting. West Chester is a suburb
of Cincinnati and I’m in a suburb of Cleveland so this meeting was all virtual. The presentation
was on ham radio VoIP modes (Voice over IP) and my system that links these modes together.
There was great questions and discussion around VoIP. This is the club that operates out of the
Voice of America Museum and holds tours during Hamvention. You can find their Monday
night net on my system at 8pm.
Technical
Coordinator
Jeff Kopcak, K8JTK
The new FCC exposure requirements. Maybe you’ve
heard about them. Maybe not. Maybe wondering
how they apply to your station. The FCC Report and
Order does not change RF Exposure (RFE) limits but
does require all
services, including amateur radio, to evaluate limits
or take the exemption. There’s probably a lot I don’t
understand.
With respect to those much smarter than myself, I’ll
try my best to explain this but I’m probably going to
get some stuff wrong. In addition to covering
reasons for these changes and what they mean to
most hams, I’ll walk through an exception
calculation. Those are easiest and likely the only
calculation a ham might need to perform in most
cases.
In 2019, the FCC adopted new rules to limit human
exposure to radio frequency energy. These rules
went into effect on May 3rd, 2021. Not much
changed in these new rules except that Amateur
Radio is no longer categorically excluded from
performing these evaluations to demonstrate
compliance. Previously, only when a station
exceeded certain power limits was an evaluation
required. For the most part, operating barefoot on
HF (without an amplifier, typically 100 watts or less)
or operating most dual band radios with 50 watts or
less, all were categorically exempt. The second
exclusion, no mobile stations had to perform these
evaluations. Both
exclusions are now removed, gone. Exclusions are
replaced with the exemption.
Removing the amateur radio exclusions means
hams are now required to perform evaluations in
all cases. But! You do not submit anything to the
FCC. Do the evaluation, print out/save results
or put notes on paper – they are to be kept with
each station’s records. These records would be
used in a situation where a complaint is filed with
the FCC against your station. Such as:
neighbor doesn’t care for your tower/antenna.
Writes the FCC saying their family is subject to
harmful radiation. The FCC takes those complains
fairly seriously and will come knocking for
an inspection (which they can - and will do. See
97.103, (a) and (c) specifically). The
representative may ask for this evaluation. They will
implicitly trust the results if they appear to
be correct and the station is otherwise compliant.
This is the self-regulation abilities we are
allotted by the FCC. The FCC will inform the
neighbor, based on evaluation of the station, it was
found to be compliant and they have nothing to
worry about. Another scenario maybe a building
permit is sought in order to erect a tower. The entity
that grants the permit might ask to have an
evaluation completed.
In any case, each amateur station certifies, on their
605 form, they will comply with
Radiofrequency Radiation Safety. Licensed hams are
considered trained in safety by way of
passing the license exam. Completing an RF safety
evaluation does not exempt any station from
being otherwise compliant and responsible. If a
station is transmitting, someone comes up and
touches the antenna, the station operating the
equipment is still responsible.
If you were one that completed an evaluation under
the old rules, that evaluation is still valid
until 2023. You have 2 years to complete an
evaluation under the new rules. Every station (not
grandfathered under the old rules) must complete
an evaluation after May 3, 2021 – including
new stations or when any significant changes are
made to an existing. Changes would include an
increase in power, better antenna, better coax,
moving the antenna closer to areas occupied by
humans. HTs manufactured before May 3, 2021 are
grandfathered – no evaluation needed ever.
HTs manufactured after May 3, a SAR (Specific
Absorption Rate) evaluation is performed by the
manufacturer.
The exemption calculation is a formula which
indicates if the antenna is compliant or more
evaluation is needed. Exemptions require less
calculations than a full exposure analysis.
Exemptions cannot be taken with in the reactive
nearfield. Distance to a person is important.
Any transmitter within 20 cm (7.87 inches) of the
body is considered in the nearfield and requires
a SAR evaluation. Nearfield also varies with
frequency.
The HT falls into this weird area because they are
almost always used within 7.87 inches of the
body. At this time, the methods for completing an
evaluation are not clear for a few reasons: 1)
above 300 MHz is not really measurable, which only
affects 2-meter handhelds. 2) SAR
evaluations are very costly and require specially
calibrated equipment. 3) absorption inside the
body is very hard to measure. Cell phone
manufactures have to complete SAR evaluations for
every handset and antenna configuration. To add
insult-to-injury, a SAR would have to be
completed in each position of the radio. That is to
say holding the radio straight up, slight angle,
talking across the microphone, holding the radio
with the right hand, left hand, and so on. Chaching!
Not so fast. Radio manufactures will be responsible
for performing this SAR evaluation.
In the evaluation, they will likely use the stock
rubber duck antenna provided with the radio. If
you change the antenna (as most of us do) with a
3rd party or aftermarket, that means all
evaluations need to be performed using the new
configuration. This is an area the ARRL is still
working out with the FCC for clarification. Right now,
your HT is OK. Will manufacturers pass
on the cost to the consumer? Unknown for sure but
very likely.
Don’t forget these evaluations need to be
performed at field day sites, repeater sites, and
beacon
locations. Field day sites may need restrictions
placed on frequency or power allowed to meet
the requirements. Adjustments to antennas maybe
needed, adding time to the field day setup.
In places where SAR is performed, an MPE
(Maximum Permissible Exposure) chart displays the
amount of energy which should not be exceeded at
different frequencies. There are two different
categories: occupational/controlled exposure (hams
and their families) at 6-minute average and general
population/uncontrolled (everyone else, such as
neighbors) with a 30-minute average. MPE is lowest
between 30 MHz and 300 MHz because those
frequencies are easily absorbed by the human body.
Say we have a station with a multiband antenna (20-
10 meters) with 0 dbd of gain (manufacturer specs).
There is a sidewalk 15 feet (5 meters) away (closest
human exposure to radiation) from the antenna.
The
transmitter outputs 100 watts into 50 feet of RG-58.
The highest frequency in operation is 29.70 MHz. 50
feet of RG-58 at 29.7 MHz is rated at 1db of loss (mfr
specs), which is 22% (find a gain/loss table or
calculator for this percentage).
First, are people within the distances (antenna to
human) in the table below for near field
exposure?
Nearest person would be 15 feet away and lowest
band we plan to operate is the 20-meter band
since the antenna is capable. No, humans are not
within the reactive nearfield (10.3 feet). We
can continue with the exemption calculation. If
humans are within the nearfield, a full evaluation
needs to be completed.
Next, calculate the maximum ERP. For a multiband
antenna, ERP decreases at higher frequencies so
you only need to calculate at the highest frequency
the station plans to use. 10 meters in this case.
3450 R2/f2 = Maximum ERP (formula for the range
1.34-30 MHz)
3450 x (5 meters)2/ (29.7 MHz)2 = 97.8 watts
maximum ERP
Calculate the station’s ERP:
(Transmitter power – Feedline loss) x Antenna gain =
ERP
(100W – 22W) x 1.0 = 78 Watts ERP
To compare, 78 watts is less than 97.8 watts. This
antenna qualifies for an exception!
What happens if the station cannot take the
exception? If you never transmit 29.7 MHz and only
plan to use lower frequencies, calculate at the lower
frequency. Move the antenna further away from the
sidewalk. Or perform a full evaluation. The
exemption numbers are verrry conservative
numbers and conservatively safe. If actual exposure
is calculated on the sidewalk, it will be less than the
exception calculation. Averaging time is not
taken into account. If the station talks for 15
minutes and listens for another 15 minutes, the
exposure is halved. Areas like a sidewalk, people are
likely to be there for only a few seconds at
a time.
Online calculators are a huge help in performing
power density estimations. VP9KF’s calculator
performs MPE calculations. The Lake Washington
Ham Club site calculates MPE by taking into
account transmitter duty cycle. It will provide
minimum safe distance to the antenna.
To perform a full analysis, the FCC aid for evaluating
human exposure is OET Bulletin 65 and
OET Bulletin 65 supplement B. The no-longer-in-
print book by Ed Hare – W1RFI is available
for download as a PDF. Modeling software is
available for free or little cost. One such modeling
application is EZNEC. The ARRL is working on finding
or developing tools for all hams to use.
Those can be found at: http://www.arrl.org/rf-
exposure and the ARRL Technical Information
Service is a member benefit that can provide more
information. Finally, Greg – N9GL, Chairman
of the ARRL RF Safety committee, gave a very
informative presentation on these changes. It
runs 2 hours with Q&A. Ria – N2RJ, director of the
ARRL Hudson Division, has a YouTube
channel with a video on this topic. The majority of
the information in this article came from both
videos, thanks to both Greg and Ria.
Recent FCC NPRM’s have put ham radio use of the
5GHz band at risk. These frequencies are
utilized for things like mesh networking. Who wants
to take away these allocations?
Commercial interests to push the 5G mobile
standard. These same interests have already taken
part of the 3 GHz WiFi band. ARDEN Mesh is fighting
back, legally, against repurposing these
allocations. If you have 5 GHz AREDN mesh nodes in
the lower 45 – 5.850-5.895 GHz or upper
30 – 5.895-5.925 GHz channels, please take the time
to read and respond to their solicitation for
information.
Another huge thank you to the West Chester
Amateur Radio Association - WC8VOA, which I’m
also a member, for having me as the presenter at
their May 6th meeting. West Chester is a suburb
of Cincinnati and I’m in a suburb of Cleveland so this
meeting was all virtual. The presentation
was on ham radio VoIP modes (Voice over IP) and
my system that links these modes together.
There was great questions and discussion around
VoIP. This is the club that operates out of the
Voice of America Museum and holds tours during
Hamvention. You can find their Monday
night net on my system at 8pm.