# 47 C.F.R. § 73.616 (2026): References to TV station interference protection methodology

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T47_P73_S73_616

## Section

- **Citation:** 47 C.F.R. § 73.616 (2026)
- **Heading:** References to TV station interference protection methodology
- **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 / § 73.616: § 73.616   References to TV station interference protection methodology.

## Text

(a)-(c) [Reserved]
(d)
Calculation of interference
(1) For evaluating compliance with the requirements of this paragraph, interference to populations served is to be predicted based on the most recent official decennial U.S. Census population data as identified by the Media Bureau in a Public Notice issued not less than 60 days prior to use of the data for a specific year in application processing and otherwise according to the procedure set forth in OET Bulletin No. 69: “Longley-Rice Methodology for Evaluating TV Coverage and Interference” (February 6, 2004) (incorporated by reference, see § 73.8000), including population served within service areas determined in accordance with § 73.619, consideration of whether F(50,10) undesired signals will exceed the following desired-to-undesired (D/U) signal ratios, assumed use of a directional receiving antenna, and use of the terrain dependent Longley-Rice point-to-point propagation model. Applicants may request the use of a cell size other than the default of 2.0 km per side, but only requests for cell sizes of 1.0 km per side or 0.5 km per side will be considered. The threshold levels at which interference is considered to occur are:
(i) For co-channel stations, the D/U ratio is + 15 dB. This value is only valid at locations where the signal-to-noise ratio is 28 dB or greater. At the edge of the noise-limited service area, where the signal-to-noise (S/N) ratio is 16 dB, this value is + 23 dB. At locations where the S/N ratio is greater than 16 dB but less than 28 dB, D/U values are computed from the following formula:
D/U = 15 + 10log
10
[1.0/(1.0−10
−x/10
)]
Where x = S/N-15.19 (minimum signal to noise ratio)
(ii) For interference from a lower first-adjacent channel, the D/U ratio is −28 dB.
(iii) For interference from an upper first-adjacent channel, the D/U ratio is −26 dB.
(2) [Reserved]
(e)-(g) [Reserved]
[73 FR 5682, Jan. 30, 2008, as amended at 83 FR 5021, Feb. 2, 2018; 83 FR 5544, Feb. 8, 2018; 86 FR 66195, Nov. 22, 2021; 89 FR 7245, 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_616. Check the current official text before relying on it. Not legal advice.