HP 11757B Manuale - Pagina 7

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Digital Radio Testing

Static M-Curve

Measurement

Equipment Setup

Note

1-4

1. The basic setup for all measurements involves

interrupting the IF path of the digital radio with a

fading simulator. If a Bit Error Rate Tester (BERT)

is used, connect the appropriate data channels. In

the gure below, the DS3 data out from the BERT

is connected to the DS3 input of the transmitter,

and the BASEBAND output of the receiver to the

DS3 data input of the BERT. DS3 is used only as an

example; if your radio requires another data format,

use a BERT that produces it. The ERROR OUTPUT

of the BERT is connected to the ERROR PULSE

INPUT of the Fader. This input can be set to match

the impedance of the BERT.

Some digital radios have their own error outputs and

internal data checking schemes that limit the need for

a BERT. See the manual for your radio if you wish

to connect the ERROR PULSE INPUT of the Fader

directly to the radio. There may be a connection that

must be made between two ports of the radio system for

this to work.

2. The RF output of the transmitter is connected to the

RF input of the receiver. Appropriate attenuation is

used to protect the RF input of the receiver. Check

the manual of the receiver and the transmitter to

insure safe levels for the receiver input.

3. The Alarm Output on the receiver can be connected

to the Alarm Input on the Fader. This connection is

only needed for recovery tests, and tests where no

BERT is available and you want to use the ALARM

INPUT to indicate failure.

HP 11757B