5.Panel Operation
40
(4)
Select modulating wave source
:
BPSK uses internal modulation source. Press the
DataSource
softkey to select
PN15
,
PN21
,
01 Patt
,
or
10 Patt
as the modulating wave source.
(5)
Set BPSK rate
:
Press the
Bit rate
softkey to set the BPSK rate. The rate at which the output
phase shifts between the carrier phase and the modulating phase is determined
by BPSK rate (for internal source). The range is 2 mHz – 1 MHz.
(6)
Set BPSK phase deviation
:
Press the
Deviation
softkey to set the modulating phase deviation.
QPSK (Quadrature Phase Shift Keying)
Quadrature Phase Shift Keying modulation is a modulation technique that shifts the
output signal phase among four preset phases: the carrier phase and three
modulating phases. The shift frequency (QPSK rate) is determined by the internal
signal level of the instrument. The QPSK user interface is shown below.
Modulating wave
Carrier wave
Parameter 1
Parameter 2
Parameter 3
Load
Mod
Type Source
Parameter 4
Figure 5-22: QPSK user interface
How to set the parameters of QPSK
(1)
Press the
Mod
function key, then press the
Type
softkey, turn the
knob
to select
QPSK
, press the
OK
softkey.
(2)
Select carrier wave shape
:
The carrier wave can be
Sine
,
Square
,
Ramp
, or
Arbitrary
wave (except DC).
Press
,
,
, or
to select a desired carrier wave shap.
