FCC and ISED Signal Booster/Zone Enhancer Emissions Rules and Exposure Limits
Comba Telecom has designed mechanisms within the Signal Booster/Zone Enhancer hardware and software
that can be used to optimize RF performance and minimize the impact to the outdoor network. HOWEVER, it
is important to note that poor system design or poor adjustment to the device settings can lead to violations of
the emissions rules defined by FCC and ISED, and even worse, could generate harmful interference to the
outdoor network potentially impairing widespread radio communications. Good engineering practice MUST be
used when operating the device to ensure you do not violate any of these rules or generate harmful interference.
Comba Telecom is not responsible for meeting these emissions rules. The signal booster/zone enhancer
operator is responsible for meeting these emissions rules.
Web Address for FCC Part 90 Section 90.219 rules:
https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-90/subpart-I/section-90.219
Web Addresses for ISED rules:
https://ised-isde.canada.ca/site/spectrum-management-telecommunications/en/learn-more/key-documents/procedures/client-
procedures-circulars-cpc/cpc-2-1-05-zone-enhancers
https://ised-isde.canada.ca/site/spectrum-management-telecommunications/en/rss-131-zone-enhancers
https://ised-isde.canada.ca/site/spectrum-management-telecommunications/en/devices-and-equipment/radio-equipment-
standards/radio-standards-specifications-rss/rss-gen-general-requirements-compliance-radio-apparatus
https://ised-isde.canada.ca/site/spectrum-management-telecommunications/en/devices-and-equipment/broadcasting-
equipment-standards/broadcasting-equipment-technical-standards-betsdevices-and-equipment/broadcasting-equipment-
standards/broadcasting-certificate-exempt-radio-apparatus-0
This device complies with Part 15 of the FCC rules and RSS-131 Issue 4 of the ISED rules. Comba cannot
accept responsibility for any failure to satisfy the protection requirements resulting from a non-recommended
modification or adjustment of the product. Operation is subject to the following conditions:
1. This device may not cause harmful interference and
2. This device must accept any interference received, including interference that may cause undesired
operation.
3. Nominal Passband Gain: 90dB MAX
4. Rated Mean Output power: up to +33dBm MAX per band.
5. Input and output Impedances: 50 ohms.
The manufacturers rated output power of this equipment is for single carrier operation. For situations where
multiple carrier signals are present, the rating must be reduced by 10 x Log(# of carriers), especially where the
output signal is re-radiated and can cause interference to adjacent band users. This power reduction is done
by the input power or gain reduction and not done by an attenuator at the output of the device.
The equipment complies with FCC/IC radiation exposure limits set forth for an uncontrolled environment and
meets the FCC radio frequency (RF) Exposure Guidelines in Supplement C to OET65 and RSS-102 of the IC
radio frequency (RF) Exposure rules. This equipment should be installed and operated so that the antenna
gains and passive losses between the signal boosters used with this device should result in 0dBi or less
radiated power and the antenna/radiator is at least 7.9 inches (20cm) or more away from a person’s body.
RF Exposure Statement for ISED: “This device complies with Health Canada’s Safety Code. The installer of
this radio equipment must ensure that the antenna is located or pointed such that it does not emit RF field more
than Health Canada limits for the general population; consult Safety Code 6, obtainable from Health Canda’s
website https://www.hc-sc.ca/rpb.
The antenna(s) used for this transmitter must be installed to provide a separation of at least 18” (45 cm) in DL
and 18” (45 cm) in UL from all persons and must not be collocated or operating in conjunction with any other
antenna or transmitter. Changes or modifications not expressly approved by the party responsible could void
the installer’s authority to operate the equipment.
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