Date:
09-May-2019
Product name
RTX2018
File
: RTX2018 User Manual 1.0.docx
Ref.: FHA
Page: 24 of 34
This document and the information contained is property of RTX A/S, Denmark, and should be regarded as confidential.
Unauthorized copying is not allowed. The information in this document is believed to be correct at the time of writing. RTX A/S
reserves the right at any time to change said content, circuitry and specifications.
Figure 13. TX PSK tester setup detail
5.3.2
Capture Time
The
“C
apture Time
” filed shows
the time period where the analysis DLL will get samples from
the CMW100. The
“
Start
”
and
“
Stop
”
time is adjusted by entered values in the box or by using
the slider. The
“C
apture Time
”
can also be fine-tuned using the
“
+
”
or
“–“
button.
The shorter the capture length, the smaller the amount of data transferred to the DLL (which
also will decrease the computation time).
The allowed range for the start of capture time is -50 to -11 us.
The DLL will try to demodulate the capture signal for the part of the signal where the power
level is above the trigger level. The DLL analysis engine will do an iterative frequency offset
compensation and demodulation to find the best estimate for the frequency offset of the
signal.
This also implies that the estimated frequency offset will be independent of the weight of 0’s
and 1’s in the signal
.
The capture time is shown in µs. The values of the
“C
apture Time
”
are adjusted every time a
slot type is selecte
d in the “Slot Type” drop
-down menu at the top.
5.3.3
Evaluation Window
The
“
Evaluation Window
” file
is the window in which the TX parameters are evaluated. This
window is shown with a blue shade
in the graph.
