Technical data

408 Chapter 15
Signal Generator
Using the Signal Generator
Signal Generator
16 Select the signal format from
the list using the up and down
arrow keys.
a. If you have selected a
CDMA Forward Link
modulation type, select
PN Offset. For other
modulation types, you do
not need to select
PN Offset.
b. If you have selected
cdma2000 modulation
with fundamental
channels, you also need to
press [R-FCH Pwr].
The
PN Offset is a “short code” sequence
that provides a unique identifier for each
sector of each cell site. The PN Offsets are
applied to the I and Q signals before
modulation. PN Offsets are offset in time by
52.08 µs and they repeat every 26.666 ms.
This yields 512 unique short code sequences
(0-511). The mobile phone needs the PN
Offset to decode information in the Sync and
Paging channels, which are transmitted by
the base station.
R-FCH Pwr specifies the Reverse
Fundamental Channel Power, and applies
only to cdma-2000 RC3 channels. It does not
apply to cdma IS-95 RC1 and cdma IS-95
RC2 reverse link channels.
17 Enable the RF output, set the
RF output amplitude, and set
the step key increments.
a. [Amplitude]
b. [RF] Select
On.
c. [Amplitude]
d. Enter the amplitude value
using the numeric keypad.
e. [dBm]
f. [Ampl Step]
g. Enter the step value using
the numeric keypad.
h. [dB]
You may also enter a new value for
amplitude by turning the rotary knob until the
desired value is displayed or by using the up
and down arrow keys.
Step Notes