Compliance

FCC ID: MIJAD510

Test Report

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FCCID_326436

6.0B Global Navigation Satellite System Scans

6.1B Test Description

The out-of-band emissions in the 1559-1610 MHz band were measured per 47 CFR Part 25,
Section 25.216, to assure protection of aeronautical radionavigation-satellite services. The
requirements are that the emissions do not exceed -70 dBW/MHz (-40 dBm/MHz) averaged over
20 msec, in the 1559-1605 MHz band or a level in the 1605-1610 MHz band determined by
linear interpolation from –70 dBW/MHz at 1605 MHz to –10 dBW/MHz (+20 dBm/MHz) at
1610 MHz. The EIRP of discrete emissions of less than 700 Hz bandwidth from mobile earth
stations shall not exceed –80 dBW (-50 dBm), averaged over 20 msec, in the 1559-1605 MHz
band.

6.2B Test Measurement Procedure

Since there was no direct interface to the power amplifier output of the AD510-10, these out-of-
band emissions were measured using radiated emission measurement procedures. The
measurements were conducted for both wideband and narrowband emissions using 1 MHz and 1
kHz bandwidths, respectively. Since typical receivers do not have 700 Hz bandwidths a
1 kHz bandwidth was used as a worst case scenario.

The emissions were measured with the Iridium Subscriber Unit (ISU) transmitting at the
maximum output power in Channels 3, 120, and 238. All three channels provided similar
results. A gated average measurement was used to determine the emission levels with the sync
pulse (frame tick) from the ISU connected to the external sync of the Rohde & Schwarz ESI7
Receiver. Initially, the carrier was maximized and subsequently the out-of-band emissions were
measured in the 1559-1610 MHz bands. The worst case plots for these scans are shown in the
attached pages.

6.3B Test Results

The EIRP limits provided above can be converted to field strength in dBuV/m using the
following equation:
FS (dBuV/m) = EIRP (dbm) - 20 log (R) + 104.77 ; where R = 3 meters

Therefore, the applicable limits for this test are as follows:
EIRP (dBm) Field Strength (dBuV/m)
-40 55.2
-50 45.2
-10 115.2

These limits are displayed on the attached graphs and indicate that the ISU, when used in
conjunction with the AD510-10 active antenna, is compliant with the requirements for protection
of the radionavigation-satellite services. The appropriate antenna factors have been included as a
transducer factors as indicated by the “TDF” displayed to the right of the graph. The applicable
cable loss was also included as an amplitude offset (4 dB was worst case across the band) to the
levels measured from the AD510-10.

Exhibit 6B
Page 2 of 5 FCC ID: MIJAD510
4/28/03

Figure 6.0B-1 GNSS Wideband Out-of-Band Emissions, 1559-1605 MHz

Marker 1 [T1] RBW 1 MHz RF Att 0 dB
Ref Lvl 52.13 dB æ V/m VBW 1 MHz
55 dB* 1.60453908 GHz SWT 5 ms Unit dBæ V/m
55
4 dB Offset
54 A

1
52
GAT

50

IN1
1AVG 1AV
48

46

44 TDF

42

40

38

36

35
Start 1.559 GHz 4.6 MHz/ Stop 1.605 GHz

Date: 25.APR.2003 14:19:34

Exhibit 6B
Page 3 of 5 FCC ID: MIJAD510
4/28/03

Figure 6.0B-2 GNSS Wideband Out-of-Band Emissions, 1605-1610 MHz
Marker 1 [T1] RBW 1 MHz RF Att 0 dB
Ref Lvl 52.20 dB æ V/m VBW 1 MHz
101 dB* 1.60565130 GHz SWT 5 ms Unit dBæ V/m
101
4 dB Offset
A

90

GAT
80

70 IN1
1AVG 1AV

60

1
50

TDF

40

30

20

10

1
Start 1.605 GHz 500 kHz/ Stop 1.61 GHz

Date: 25.APR.2003 15:05:57

Exhibit 6B
Page 4 of 5 FCC ID: MIJAD510
4/28/03

Figure 6.0B-2 GNSS Narrowband Out-of-Band Emissions, 1559-1605 MHz

Marker 1 [T1] RBW 1 kHz RF Att 0 dB
Ref Lvl 24.93 dB æ V/m VBW 1 kHz
59 dB* 1.60453908 GHz SWT 115 s Unit dBæ V/m
59
4 dB Offset
A
55

50 GAT

45
IN1
1AVG 1AV
40

35

TDF
30

1
25

20

15

9
Start 1.559 GHz 4.6 MHz/ Stop 1.605 GHz

Date: 25.APR.2003 14:55:53

Exhibit 6B
Page 5 of 5 FCC ID: MIJAD510
4/28/03

Document Created: 2019-11-16 02:42:01
Document Modified: 2019-11-16 02:42:01

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