Changing The Modem Doppler Tracking Time - R&S M3SR 4100 Series Operating Manual

M3SR Series 4100
4.5.4.2

Changing the Modem Doppler Tracking Time

Softkey
Operating Manual 6175.4760.02 – 01
Type
Toggle
Changing the Modem Doppler Tracking Time
Description
1. Press the softkey to toggle modem Dop-
pler tracking time between slow and fast.
Possible values:
• slow
• fast
The HF modem implementation is able to track
the Doppler offset present in the signal at the
receiver.
Therefore the modem can handle such fre-
quency offsets automatically and ensure su-
perior performance over a wide range of
Doppler offsets.
Slow tracking can handle higher offsets, but
the signal acquisition takes longer.
Fast tracking limits the range of frequency off-
set which can be detected.
4.135