Technical data

422 Chapter 16
Spectrum Analyzer
Using the Spectrum Analyzer
Spectrum Analyzer
Using the RF OUT Loss field
The RF OUT Loss field is used when you need to test the receiver sensitivity of a
typical base station. The test set’s source will typically go down to –95 dBm, so in
order to reach –113 dBm for sensitivity testing, you must use an external attenuator.
The measured value of the attenuator and connecting cables are entered into this
field. This value is then used when this field is set to
On. When this field is set to
On, the test set will set the RF generator level to the correct level offset by the
external attenuator/cabling. When you set the RF Generator to –113 dBm (with the
RF OUT Loss field turned
On and the external attenuator/cabling loss value entered)
6[Mod Format]
7 Select the channel standard
from the list using the up and
down arrow buttons.
8 [Select]
9 Set the RF output amplitude
a. [Amplitude]
b. Enter the amplitude value
using the numeric keypad.
c. [dBm].
You may also enter a new value for
amplitude by turning the rotary knob until the
desired value is displayed or using the up and
down arrow keys.
10 If you have previously stored
RF Out Loss from an
insertion loss measurement,
go to the next step.
Or
Press [RF OUT Loss] to
select
On and enter the RF
Out Loss value.
For information on the effects of the RF Out
Loss function on the amplitude, refer to
“Using the RF Out Loss field” below.
Each time you press this softkey, the selected
option changes.
11 Connect to the base station.
12 On [Enable Sig Gen] select
On.
Each time you press this softkey, the selected
option changes.
Step Notes