Frequency range | In authorized bandwidth of service | |
Field strength (mV/m) | Power flux density1 (dBW/m2) | |
Below 540 kHz | 10 | -65.8 |
540 to 1600 kHz | 20 | -59.8 |
1.6 to 470 MHz | 10 | 2-65.8 |
470 to 890 MHz | 30 | 2-56.2 |
Above 890 MHz | 1 | 2-85.8 |
1 Equivalent values of power flux density are calculated assuming free space characteristic impedance of 376.7 = 120[PI] ohms.
2 Space stations shall conform to the power flux density limits at the earth's surface specified in appropriate parts of the FCC rules, but in no case should exceed the above levels in any 4 kHz band for all angles of arrival.
Table 2 to Paragraph (m)(1)
Space service designation in which the transmitting earth station operates | Fixed-Satellite | ||||
Frequency bands (GHz) | 17.3-17.7 | 17.3-17.8 | |||
Space service designation in which the receiving earth station operates | Broadcasting-Satellite | Fixed-Satellite | |||
Orbit | GSO | GSO | |||
Modulation at receiving earth station | N (digital) | N (digital) | |||
Receiving earth station interference parameters and criteria: | 17/24 GHZ BSS | FSS | |||
p0 (%) | 0.015 | 0.003 | |||
n | 2 | 2 | |||
p (%) | 0.015 | 0.0015 | |||
NL(dB) | 1 | 1 | |||
Ms (dB) | In the area specified in § 25.140(b)(3) | In the area specified in § 25.140(a)(3)(iii) | |||
(i) and (iv) | (ii) | (iii) | (A) | (B) | |
4.8 | 3.0 | 1.8 | 2.5 | 0.8 | |
W(dB) | 4 | 0 | |||
Receiving earth station parameters: | 17/24 GHz BSS | FSS | |||
Gm (dBi) | 36 | N/A | |||
Gr | 0 | 0 | |||
emin | 20° | 5° | |||
Te (K) | 150 | 300 | |||
Reference bandwidth: B (Hz) | 106 | ||||
Permissible interference power: Pr(p) (dBW) in B | In the area specified in § 25.140(b)(3) | In the area specified in § 25.140(a)(3)(iii) | |||
(i) and (iv) | (ii) | (iii) | (A) | (B) | |
-146.8 | -149.8 | -152.8 | -144 | -150.1 |
47 C.F.R. §25.203
For FEDERAL REGISTER citations affecting § 25.203, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.