Agilent Technologies E7495A RF Manual de Serviço descarregar pdf (Página 538)

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538 Chapter 19

W-CDMA or W-CDMA (with HSDPA) Analyzer

Using the W-CDMA or W-CDMA (with HSDPA) Analyzer

W-CDMA or W-CDMA (with HSDPA)

Analyzer

as the frequency reference for the W-CDMA and the W-CDMA (with HSDPA) Tx

measurements because it provides an independent reference for measuring the

operating frequency of the base station. A GPS antenna must be connected to the

GPS input of the test set, and the antenna must have a clear view of the sky in order

for the GPS to lock. If a GPS signal cannot be obtained, you can use the frequency

reference provided by the base station to perform the measurement.

The E7495A/B test set supports all of the following frequency references and time

references:

• Frequency and Time - GPS (External antenna supplied)

• Frequency and Time - External Even Second Pulse

• Frequency only - Internal Reference

• Frequency only - External 1.000 MHz (E7945B only)

• Frequency only - External 2.048 MHz (E7945B only)

• Frequency only - External 4.950 MHz (E7945B only)

• Frequency only - External 10.000 MHz

• Frequency only - External 13.000 MHz (E7945B only)

• Frequency only - External 15.000 MHz (E7945B only)

• Frequency only - External 19.6608 MHz

If you use the frequency reference provided by the base station, keep in mind that

the frequency error metric will only be measuring the error relative to the base

station reference signal, and not relative to absolute frequency and time. You will

not be able to determine if the base station frequency is aligned with the other base

stations in the network. Since the GPS provides an independent reference, the

frequency error metric can be used to determine if the base station frequency is

offset from the rest of the network.

RF Connections

For the RF connection, you can connect the E7495A/B RF Input Port either directly

to the Tx RF output of the base station, or to the coupled output port on the base

station when you are making W-CDMA or HSDPA transmitter measurements. In

this way, the base station can remain on-air (in-service) while Tx measurements are

being made. If the RF Input port of the instrument is connected directly to the Tx RF

output, then the base station (or at least that sector) must be taken out of service.

CAUTION The maximum power for the RF In (Port 1) and RF Out/SWR (Port 2) ports is

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