# 47 C.F.R. § 73.611 (2026): Emission levels and mask filter

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_611

## Section

- **Citation:** 47 C.F.R. § 73.611 (2026)
- **Heading:** Emission levels and mask filter
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 47 CFR: Telecommunication / Chapter I: FEDERAL COMMUNICATIONS COMMISSION / Part 73: RADIO BROADCAST SERVICES / Subpart E: Television Broadcast Stations / § 73.611: § 73.611   Emission levels and mask filter.

## Text

(a) The power level of emissions on frequencies outside the authorized channel of operation must be attenuated no less than the following amounts below the average transmitted power within the authorized channel. In the first 500 kHz from the channel edge the emissions must be attenuated no less than 47 dB. More than 6 MHz from the channel edge, emissions must be attenuated no less than 110 dB. At any frequency between 0.5 and 6 MHz from the channel edge, emissions must be attenuated no less than the value determined by the following formula:
Formula 1 to Paragraph (
a
)
Attenuation in dB = −11.5(Δf + 3.6);
Where:
Δf = frequency difference in MHz from the edge of the channel.
(b) This attenuation is based on a measurement bandwidth of 500 kHz. Other measurement bandwidths may be used as long as appropriate correction factors are applied. Measurements need not be made any closer to the band edge than one half of the resolution bandwidth of the measuring instrument. Emissions include sidebands, spurious emissions and radio frequency harmonics. Attenuation is to be measured at the output terminals of the transmitter (including any filters that may be employed). In the event of interference caused to any service, greater attenuation may be required.
[89 FR 7243, Feb. 1, 2024]

## Nearby sections

- [47 C.F.R. § 73.601 (2026) § 73.601   Scope of subpart.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_601.md)
- [47 C.F.R. § 73.602 (2026) § 73.602   Cross reference to rules in other parts.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_602.md)
- [47 C.F.R. § 73.603 (2026) § 73.603   Numerical designation of television channels.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_603.md)
- [47 C.F.R. § 73.606 (2026) § 73.606   Table of allotments.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_606.md)
- [47 C.F.R. § 73.609 (2026) § 73.609   Zones.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_609.md)
- [47 C.F.R. § 73.611 (2026) § 73.611   Emission levels and mask filter.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_611.md)
- [47 C.F.R. § 73.612 (2026) § 73.612   Protection from interference.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_612.md)
- [47 C.F.R. § 73.614 (2026) § 73.614   Power and antenna height requirements.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_614.md)
- [47 C.F.R. § 73.616 (2026) § 73.616   References to TV station interference protection methodology.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_616.md)
- [47 C.F.R. § 73.617 (2026) § 73.617   Interference protection of other services.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_617.md)
- [47 C.F.R. § 73.618 (2026) § 73.618   Antenna location and principal community coverage.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_618.md)
- [47 C.F.R. § 73.619 (2026) § 73.619   Contours and service areas.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_619.md)
- [47 C.F.R. § 73.620 (2026) § 73.620   Interference calculation and protection of TV broadcast services.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_620.md)
- [47 C.F.R. § 73.621 (2026) § 73.621   Noncommercial educational TV stations.](https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_621.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_611. Check the current official text before relying on it. Not legal advice.