Radiated Power Density

0559-EX-ST-2019 Text Documents

Higher Ground LLC

2019-04-08ELS_227103

Section 25.220 of the FCC Rules applies to stations that do not qualify for routine licensing under
relevant criteria in §25.138, §25.211, §25.212, §25.218, §25.221(a)(1) or (a)(3), §25.222(a)(1) or
(a)(3), §25.226(a)(1) or (a)(3), or §25.227(a)(1) or (a)(3). The proposed experimental operations will
comply with the criteria in Section 25.218 as shown below, and thus would be eligible for routine
licensing and a certification from the satellite operator under Section 25.220 should not be required,
just as it was not required for prior Higher Ground experimental applications (See Call Sign
WH2XHP).

§25.218 Off-axis EIRP density envelopes for FSS earth stations transmitting in certain
frequency bands.

(a) This section applies to applications for FSS earth stations transmitting to GSO space
stations in the conventional C-band, extended C-band, conventional Ku-band, or extended Ku-band,
with the following exceptions:

(1) ESV, VMES, and ESAA applications and

(2) Applications proposing transmission of analog command signals at a band edge with
bandwidths greater than 1 MHz or transmission of any other type of analog signal with bandwidths
greater than 200 kHz.

(b) Earth station applications subject to this section may be routinely processed if they meet the
applicable off-axis EIRP density envelopes set forth in this section.

…..

(d) Digital earth station operation in the conventional or extended C-bands. (1) For co-
polarized transmissions in the plane tangent to the GSO arc:

26.3-25log10θ dBW/4 kHz for 1.5° ≤ θ ≤ 7°.
5.3 dBW/4 kHz for 7° < θ ≤ 9.2°.
29.3-25log10θ dBW/4 kHz for 9.2° < θ ≤ 48°.
−12.7 dBW/4 kHz for 48° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. The EIRP density levels specified for θ > 7°
may be exceeded by up to 3 dB in up to 10% of the range of theta (θ) angles from ±7-180°, and by
up to 6 dB in the region of main reflector spillover energy.

(2) For co-polarized transmissions in the plane perpendicular to the GSO arc:

29.3-25log10θ dBW/4 kHz for 3° ≤ θ ≤ 48°.
−12.7 dBW/4 kHz for 48° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. These EIRP density levels may be
exceeded by up to 6 dB in the region of main reflector spillover energy and in up to 10% of the range
of θ angles not included in that region, on each side of the line from the earth station to the target
satellite.

The maximum transmitter power is 1 Watt, with a 5 MHz emission designator as indicated in the
application, resulting in a -31 dB adjustment when measured in a 4 kHz bandwidth. Thus, the power
density is:
1 𝑊𝑎𝑡𝑡 −1 𝑑𝐵𝑊
=
5 𝑀𝐻𝑧 4 𝑘𝐻𝑧

Antenna gain will increase the radiated power density, while cable losses and antenna insertion losses
will reduce the radiated power density. The transmitter and antenna will always be configured such
that the radiated power density will comply with the radiated power density limits in Section 25.218 as
shown below. The limits are shown in orange, while the radiated power density is shown in blue. By
complying with these limits, the terminal would be considered eligible for routine licensing and the
certification of the satellite operator under Section 25.220 is not required.

Radiated Power Density (dBW/4 kHz)
30

20

10

0
-100 -50 0 50 100
-10

-20

-30

-40

-50

-60

Document Created: 2019-04-08 14:30:21
Document Modified: 2019-04-08 14:30:21

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