Occupied BW Measurements

FCC ID: OIIDTSA1900-2

Test Report

Download: PDF

FCCID_37319

Omnipoint Technologies, Inc. Exhibit 12
FCC ID: OIIDTSA1900-2 Page 1 of 3

EXHIBIT 12
OCCUPIED BANDWIDTH MEASUREMENTS

This exhibit describes the procedures employed and presents results of the occupied bandwidth
measurements performed in accordance with the requirements of § 2.1049.

Requirements

Modulation requirements are not defined in Part 24, Subpart E—Broadband PCS, although
measurements of occupied bandwidth are required to obtain a type acceptance grant of equipment
authorization. Occupied bandwidth is defined in § 2.1049 as “the frequency bandwidth such that,
below its lower and above its upper frequency limits, the mean powers radiated are each equal to
0.5 percent of the total mean power radiated by a given emission.” In other words, 99% of the
total mean power radiated is found within the occupied bandwidth of the transmission.

Measurement Procedure

To measure the occupied bandwidth of the DTSA's transmission, the built-in "Occupied
Bandwidth" function of the HP8563E Spectrum Analyzer was utilized. Measurements were
made at the PCS-1900 channels closest to the bottom (channel 512, 1850.2 MHz), middle
(channel 661, 1880.0 MHz), and top (channel 810, 1908.8 MHz) of the licensed PCS spectrum in
which the DTSA transmits. Specific procedures followed during measurements of occupied
bandwidth were as follows:

1. Configure the DTSA:
• Input Voltage 9.0 VDC
• Mode Transmit, random data pattern selected using PC
controller
• RF Output Power Maximum level (step 0, 30 dBm nominal) selected
using the PC controller
• Frequencies Channel 512 (1850.2 MHz), Channel 661 (1880.0
MHz), and Channel 810 (1908.8 MHz)
2. Configure the HP8953E Spectrum Analyzer:
• Center Frequency Center of selected channel
• Span 1 MHz
• RBW 3 kHz
• Sweep Time 5 sec
• Display Max Hold
3. Use the internal capabilities of the HP8563E to measure the 99% emission bandwidth
of the transmitted pulse visible on the analyzer's display.
4. Perform measurement at all three channels.

This document contains PROPRIETARY and CONFIDENTIAL information of Omnipoint Technologies, Inc.

Omnipoint Technologies, Inc. Exhibit 12
FCC ID: OIIDTSA1900-2 Page 2 of 3

Measurement Results

A tabular summary of the 99% occupied bandwidth measurement results reported by the
HP8563E Spectrum Analyzer at each of the three specified channels is given in Table E12.1.

Table E12.1. Occupied bandwidth measurement results.

Measurement Frequency Occupied BW
(MHz) (kHz)
1850.2 243.3
1880.0 246.7
1909.8 246.7

As the results in Table E12.1 indicate, the occupied bandwidth of the DTSA transmission over
all PCS license blocks is approximately 250 kHz. A sample HP8563E spectral plot of the DTSA
transmitted pulse taken during a measurement of occupied bandwidth (at Channel 512, 1850.2
MHz), is shown Figure E12.1.

This document contains PROPRIETARY and CONFIDENTIAL information of Omnipoint Technologies, Inc.

Document Created: 2001-06-25 16:44:02
Document Modified: 2001-06-25 16:44:02

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC