Agilent Technologies Switch/Measure Uživatelský manuál stáhnout pdf (Strana 24)

Out-of-band spurious

The out-of-band spurious is a series of spectrum analyzer measurements

over a large frequency range from 100 kHz through to 12.75 GHz (for GSM900).

The settings for the measurement are seen in Figure 20.

Graphical view of limits and specifications

Practical measurements

In practice, wideband spurious is in fact a series of tests and although thorough,

these take some time. Some test equipment automates the process making the

measurement straight forward.

When to use the measurement

Wideband spurious measurements are rarely performed in manufacturing,

installation, maintenance or service, however, selected spurious measurements

can be made quickly and easily. For example, transmitters are “at risk” at

harmonic frequences. These can be checked easily in manufacturing without a

significant time penalty.

Power

(dBc)

Example: conducted, E-GSM900, normal BTS, multi-channel

Other specs apply

See Figure 25

Other specs apply

See Figure 17, 21, and 24

Other specs apply

See Figure 24

–30 dBm

DCS1800 Rx band

DCS1800 Tx band

E-GSM900 Rx band

–36 dBm

3 MHz

0.1

960

920

923

880

500

895

905

915

925

962

980

990

1000

1785

1880

12750

1805

970

965

1710

Freq (MHz)

E-GSM900 Tx band

RBW's

10 kHz

100 kHz

1 MHz

300 kHz

3 MHz

100 kHz

30 kHz

1 MHz

30 kHz

300 kHz

100 kHz

Channels and slots:

B, M, T. Multi-carrier

Hopping:

RBW:

As required

VBW:

3 x RBW. Max 3 MHz

Detection:

Peak

Sweep

max

idle

Figure 20. Wideband spurious, BTS, limits

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 35 36

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