Rohde & Schwarz 1094.0006.50, Operating Manual

Page: 286 / 374

Windows

Application CTSgo CTS-K6
1079.2001.01 30 E-3
The Phase error button
displays a popup
window with the display
of the phase curve
versus the bit position
within the ramp. The
CTS also measures the
phase with fourfold
oversampling.
By pressing the IQ
spectrum button, you
can select the
operating mode for
viewing the spectrum
within a GSM channel,
which is also called
“Narrow Spectrum” or
“IQ spectrum“ . As with
burst analysis or
generator mode, 10
parameter sets are
available. The keypad
contains ten buttons IQ
Spectrum 01 to IQ
Spectrum 10, the left
block displays the
channel, the averaging
factor, the expected
power at the input of
the CTS, the expected
waveform and the se-
lected filter bandwidth.
Typically, an output sig-
nal of a mobile modu-
lated with a 0s or 1s
sequence is measured
without signaling in this
operating mode. In this
case, the signal carrier features a 67.7-kHz offset from the middle of the channel due to the GMSK
modulation. The RF signal on the suppressed carrier and on the other sideband should be as low as
possible.
Fig.: Popup menu in GSM module test dialog
Fig.: Popup menu in GSM module test dialog