Tektronix NetTek YBT250, User Manual

Page: 145 / 338

Locating Interference
YBT250 Field Transmitter & Interference Tester User Manual
3- 43
Measuring the Noise Floor
Requires Option IN1
Noise Floor measures all the RF Power coming into the receive
antenna within the frequency band of the selected channel. The
Noise Floor is the power integrated across the selected channel. To
make an accurate measurement, the Noise Floor must be measured
on a disabled channel (a channel that is not carrying live traffic).
Larger numbers indicate more noise. Figure 3--24 shows an example
of a Noise Floor measurement.
Figure 3- 24: Example of a Noise Floor measurement
To measure the noise floor:
1. Connect a signal (see page 2--22) from a BTS receiver test port to
the YBT250 RF INPUT connector.
2. If there is no test port:
a. Disconnect the receiver cable from the transmitter.
b. Connect the receiver cable to the RF INPUT connector.
3. Select a signal standard.