frequency stability

FCC ID: KBCIX100XA775WLBT

Test Report

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FCCID_527769

SIERRA WIRELESS, INC. FCC Part 22 & 24 Test Report AC775 May 20, 2004 Page 55 of 60 8 Frequency Stability Versus Temperature FCC 2.1055 8.1 Summary of Results The AC755 Frequency Stability versus temperature meets the requirement of being within +0.1ppm of the received base station frequency. 8.2 Test Procedure The AC755 was placed inside the temperature chamber. The transmitting frequency error is measured at 25 degrees C, then the temperature is set to +60 degrees C and allowed to stabilize. After sufficient soak time, the transmitting frequency error is measured. The temperature is decreased by 10 degrees, allowed to stabilize and soak, then the measurement is repeated. This is repeated until -20 degrees C is completed. The process is then repeated back up to +60 degrees C. Frequency metering included internal averaging of the CMU200 to stabilize the reading. Reference power supply voltage for these tests is 5.0 volts. Test Setup Control Computer CMU200 Interface DUT Test Set Board DC Power Temperature Chamber Supply 8.3 Test Equipment EQUIPMENT MANUFACTURER MODEL NO. SERIAL NO. CAL. DATE Control Computer TC Generic PC 100488 N/A Wireless Test Set Rohde & Schwarz CMU200 836766/030 N/A Spectrum Analyzer Rohde & Schwarz FSP 30GHz US41421268 Sept. 12, 2003 DC Power Supply HP E3631A 100060 N/A Interface Board Shop built Minnow N/A N/A ¤ 2004 Sierra Wireless, Inc. The contents of this page are subject to the confidentiality information on page one.

SIERRA WIRELESS, INC. FCC Part 22 & 24 Test Report AC775 May 20, 2004 Page 56 of 60 8.4 Test Results High to Low Temperature Frequency Error Cellular Mode: Hot to Cold Frequency Stability 0.100 0.080 GMSK Mode Frequency Offset in PPM 0.060 8PSK Mode 0.040 0.020 0.000 -0.020 -0.040 -0.060 -0.080 -0.100 -20 0 20 40 60 Temperature in Degrees C PCS Mode: Hot to Cold Frequency Stability 0.100 0.080 GMSK Mode Frequency Offset in PPM 0.060 8PSK Mode 0.040 0.020 0.000 -0.020 -0.040 -0.060 -0.080 -0.100 -20 0 20 40 60 Temperature in Degrees C High to Low Temperature Tabular Readings Cellular Mode: 824MHz to PCS Mode: 1850MHz to 848MHz 1909MHz Temp.(C) GMSK Mode 8-PSK Mode GMSK Mode 8-PSK Mode Offset Offset Offset Offset Offset Offset Offset Offset (Hz) (ppm) (Hz) (ppm) (Hz) (ppm) (Hz) (ppm) 60 16 0.019 11 0.013 24 0.013 27 0.014 50 13 0.016 11 0.013 21 0.011 32 0.017 40 13 0.016 18 0.022 22 0.012 21 0.011 30 15 0.018 17 0.020 30 0.016 21 0.011 20 16 0.019 14 0.017 25 0.013 23 0.012 10 15 0.018 14 0.017 26 0.014 27 0.014 0 11 0.013 15 0.018 21 0.011 26 0.014 -10 15 0.018 14 0.017 21 0.011 34 0.018 -20 17 0.020 13 0.016 28 0.015 33 0.018 ¤ 2004 Sierra Wireless, Inc. The contents of this page are subject to the confidentiality information on page one.

SIERRA WIRELESS, INC. FCC Part 22 & 24 Test Report AC775 May 20, 2004 Page 57 of 60 Low to High Temperature Frequency Error Cellular Mode: Cold to Hot Frequency Stability 0.100 0.080 GMSK Mode Frequency Offset in PPM 0.060 8PSK Mode 0.040 0.020 0.000 -0.020 -0.040 -0.060 -0.080 -0.100 -20 0 20 40 60 Temperature in Degrees C PCS Mode: Cold to Hot Frequency Stability 0.100 0.080 GMSK Mode Frequency Offset in PPM 0.060 8PSK Mode 0.040 0.020 0.000 -0.020 -0.040 -0.060 -0.080 -0.100 -20 0 20 40 60 Temperature in Degrees C Low to High Temperature Tabular Readings Cellular Mode: 824MHz to 848MHz PCS Mode: 1850MHz to 1909MHz GMSK Mode 8-PSK Mode GMSK Mode 8-PSK Mode Temp.(C) Offset Offset Offset Offset Offset Offset Offset Offset (Hz) (ppm) (Hz) (ppm) (Hz) (ppm) (Hz) (ppm) -20 17 0.020 13 0.016 28 0.015 33 0.018 -10 13 0.016 17 0.020 25 0.013 24 0.013 0 18 0.022 15 0.018 25 0.013 24 0.013 10 18 0.022 15 0.018 28 0.015 33 0.018 20 17 0.020 14 0.017 20 0.011 31 0.016 30 14 0.017 17 0.020 25 0.013 28 0.015 40 13 0.016 17 0.020 33 0.018 28 0.015 50 13 0.016 21 0.025 33 0.018 23 0.012 60 18 0.022 16 0.019 31 0.016 22 0.012 ¤ 2004 Sierra Wireless, Inc. The contents of this page are subject to the confidentiality information on page one.

SIERRA WIRELESS, INC. FCC Part 22 & 24 Test Report AC775 May 20, 2004 Page 58 of 60 9 Frequency Stability Versus Voltage FCC 2.1055 9.1 Summary of Results The unit meets the limit of less than 0.1ppm of frequency offset from center for 85% and 115% of the supply voltage for 5.0 volts. 9.2 Test Procedure The AC755 was connected to a DC Power Supply and a GSM test set (CMU 200) with frequency error measurement capability. The power supply output is adjusted to the test voltage as measured at the input terminals to the module while transmitting. A voltmeter was used to confirm the terminal voltage. The peak frequency error is recorded (worst case). The test voltages are 4.25 volts to 5.75 volts. Test Setup Control CMU200 Interface DUT Test Set Board DC Power Supply 9.3 Test Equipment EQUIPMENT MANUFACTURER MODEL NO. SERIAL NO. CAL. DATE Control Computer TC Generic PC 100488 N/A Wireless Test Set Rohde & Schwarz CMU200 836766/030 N/A Spectrum Analyzer Rohde & Schwarz FSP 30GHz US41421268 Sept. 12, 2003 DC Power Supply HP E3631A 100060 N/A Interface Board Shop built Minnow N/A N/A ¤ 2004 Sierra Wireless, Inc. The contents of this page are subject to the confidentiality information on page one.

SIERRA WIRELESS, INC. FCC Part 22 & 24 Test Report AC775 May 20, 2004 Page 59 of 60 9.4 Test Results 85% to 115% of 5 Volts Frequency Error Cellular Mode: Frequency Stability Versus Supply Voltage 0.100 GMSK Mode 0.080 Frequency Offset in PPM 0.060 8PSK Mode 0.040 0.020 0.000 -0.020 -0.040 -0.060 -0.080 -0.100 4.25 4.35 4.45 4.55 4.65 4.75 Supply Voltage (V) PCS Mode: Frequency Stability Versus Supply Voltage 0.100 GMSK Mode 0.080 Frequency Offset in PPM 0.060 8PSK Mode 0.040 0.020 0.000 -0.020 -0.040 -0.060 -0.080 -0.100 4.25 4.35 4.45 4.55 4.65 4.75 Supply Voltage (V) ¤ 2004 Sierra Wireless, Inc. The contents of this page are subject to the confidentiality information on page one.

SIERRA WIRELESS, INC. FCC Part 22 & 24 Test Report AC775 May 20, 2004 Page 60 of 60 85% to 115% of 5 Volts Frequency Error, Tabular Data Cellular Mode: 824MHz to 848MHz PCS Mode: 1850MHz to 1909MHz GMSK Mode 8-PSK Mode GMSK Mode 8-PSK Mode Supply Offset Offset Offset Offset Offset Offset Offset Offset (V) (Hz) (ppm) (Hz) (ppm) (Hz) (ppm) (Hz) (ppm) 4.25 13 0.016 12 0.014 26 0.014 34 0.018 4.35 13 0.016 12 0.014 28 0.015 37 0.020 4.45 13 0.016 11 0.013 31 0.016 33 0.018 4.55 12 0.014 11 0.013 31 0.016 28 0.015 4.65 9 0.011 14 0.017 34 0.018 27 0.014 4.75 11 0.013 14 0.017 26 0.014 27 0.014 4.85 13 0.016 13 0.016 25 0.013 28 0.015 4.95 13 0.016 13 0.016 24 0.013 29 0.015 5.05 12 0.014 13 0.016 27 0.014 31 0.016 5.15 12 0.014 10 0.012 28 0.015 31 0.016 5.25 12 0.014 9 0.011 27 0.014 30 0.016 5.35 12 0.014 9 0.011 29 0.015 31 0.016 5.45 14 0.017 12 0.014 31 0.016 31 0.016 5.55 14 0.017 13 0.016 31 0.016 24 0.013 5.65 13 0.016 11 0.013 28 0.015 25 0.013 5.75 12 0.014 11 0.013 24 0.013 27 0.014 ¤ 2004 Sierra Wireless, Inc. The contents of this page are subject to the confidentiality information on page one.


Document Created: 2005-02-10 12:36:58
Document Modified: 2005-02-10 12:36:58
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