Comtec FT213 Manual de usuario descargar pdf (Pagina 15)

Spectrum Master™ Compact Handheld Spectrum Analyzer Features

LTE Signal Analyzers (Options 0541, 0542, 0546)

RF Measurements – Occupied Bandwidth

The bandwidth that contains 99% of the total carrier

power. Excessive occupied bandwidth means excessive

adjacent channel interference.

Modulation Quality – EVM

High or low values will create larger areas of cell-to-

cell interference and create lower data rates near cell

edges. Low values affect in-building coverage.

Over-the-Air Measurements – Sync Signal Power

Check for uneven amplitude of sub-carriers. Data will

be less reliable on weak sub-carriers, creating a lower

over-all data rate.

Pass/Fail Test

Set up common test limits, or sets of limits, for

each instrument. Inconsistent settings between base

stations, leads to inconsistent network behavior.

RF Measurements

(Option 0541)

Channel Spectrum

Channel Power

Occupied Bandwidth

ACLR

Modulation Measurements

(10 MHz Bandwidth)

(Option 0542)

Constellation

Reference Signal Power

Sync Signal Power

EVM

Frequency Error

Carrier Frequency

Cell ID

Sector ID

Group ID

Control Channel Power

P-SS

S-SS

PBCH

PCFICH

Over-the-Air Scanner (OTA)

(Option 0546)

Synch Signal Power (Six Strongest)

Power

Cell ID

Sector ID

Group ID

Dominance

Auto-Save with GPS Tagging and Logging

LTE Signal Analyzers

The Spectrum Master features three LTE

measurement modes:

RF Measurements•

Modulation Measurements•

Over-the-Air Measurements (OTA)•

The goal of these measurements is

to increase data rate and capacity by

accurate power settings, ensuring low

out-of-channel emissions, and good signal

quality. These attributes help to create a

low dropped call rate, a low blocked call

rate, and a good customer experience.

Cell site technicians or RF engineers can

make measurements Over-the-Air (OTA)

to spot-check a transmitter’s coverage

and signal quality without taking the cell

site off-line. When the OTA test results are

ambiguous one can directly connect to the

base station to check the signal quality

and transmitter power.

Adjacent Channel Leakage Ratio (ACLR)

measures how much BTS signal gets into

neighboring RF channels. ACLR checks the

closest (adjacent) and the second closest

(alternate) channels. Poor ACLR can lead

to interference with adjacent carriers

and legal liability. It also can indicate

poor signal quality which leads to low

throughput.

Cell ID (Sector ID, Group ID)

Cell ID indicates which base station is

being measured OTA. The strongest base

station at your current location is selected

for measurement. Wrong values for Cell ID

lead to inability to register. If the cause is

excessive overlapping coverage, it also will

lead to poor EVM and low data rates

Frequency Error

Frequency Error is a check to see that

the carrier frequency is precisely correct.

The Spectrum Master can accurately

measure Carrier Frequency Error OTA if the

instrument is GPS enabled. Calls will drop

when mobiles travel at higher speed. In

some cases, cell phones cannot hand off

into, or out of the cell.

Sync Signal Mapping

Sync Signal Scanner can be used with the

GPS to save scan results for later display

on a map. The EVM of the strongest synch

signal available at that spot is also recorded.

The Cell, Sector, and Group ID information

is also included so that it’s easier to

interpret the results. Once the Synch

Signals are mapped, it becomes much

easier to understand and troubleshoot any

interference or coverage issues.

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