Schematics

Report No.: I20W00023-WWAN_Rev1
Chongqing Academy of Information and Communication Technology
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No. 8,Yuma Road, Chayuan New City, Nan’an District, Chongqing, P. R. China,401336
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Page 523 of 585
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5.6 Frequency Stability over Temperature Variation
Specifications:
FCC Part 2.1055, 22.355, 24.235, 27.54,90.213
DUT Serial Number:
866884045632254
Test conditions:
Ambient Temperature:15℃-35℃
Relative Humidity:30%-60%
Air pressure: 86-106kPa
Test Results:
Pass
Limit
Frequency deviation
[ppm]
±2.5
Measurement Uncertainty:
Item
Uncertainty
Expanded Uncertainty
15 Hz (k=2)
Test Setup
The EUT was placed in a temperature chamber, demonstrated as figure T. The Wireless
Telecommunications Test Set was used to set the Tx channel and power level, modulate the TX
signal with different bit patterns and measure the frequency of Tx.
Test Method
1、 The EUT was turned off and placed in the temperature chamber.
2、 The temperature of the chamber was set to -30℃ and allowed to stabilize.
3、 The EUT temperature was allowed to stabilize for 45 minutes.
4、 The EUT was turned on and set to transmit with Wireless Telecommunications Test Set.
5、 The maximum transmit frequency deviation during one minute period was measured by Wireless
Communications Test Set.
6、 The steps 3-5 were repeated for -30℃,-20℃, -10℃, 0℃, 10℃, 20℃, 30℃, 40℃ and 50℃.
Note: Only worst case result is given below.