Agilent Technologies Switch/Measure Manual de usuario descargar pdf (Pagina 19)

Graphical view of limits and specifications

As with other measurements the actual limits depend on many factors, namely,

class, type, system and power level. Figure 16 gives example limits for E-GSM900

normal BTS at high power.

Practical measurements

Spectrum due to switching measurements are less difficult and less demanding

than spectrum due to modulation and wideband noise measurements. In

practice, equipment that can perform the latter can easily manage the former.

When to use the measurement

Spectrum due to switching measurements are usually performed alongside

spectrum due to modulation and wideband noise measurements.

+ 400 kHz

+ 600 kHz

+ 1200 kHz

+ 1800 kHz

Freq (MHz)

= 942.5

Power

(dBc)

–57 dBc

–67 dBc

–74 dBc

Referenced to power

in 300 kHz RBW

Trace shown in

30 kHz RBW

Example: E-GSM900, normal BTS, middle channel, high output power

Channels and slots:

B, M, T. Single carrier

All slots on and alternate

Hopping:

Off and On (B, M, T)

RBW:

30 kHz

VBW:

100 kHz

Detection:

Peak hold

Zero span

Filter:

5-pole sync tuned

Notes:

For low O/P power levels

further conditions apply (limits

are less demanding).

max

–30 dB

idle

Figure 16. Spectrum due to switching, BTS, limits

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 35 36

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