Operating Manual 6175.4760.02 – 01 4.135
M3SR Series 4100 Changing the Modem Doppler Tracking Time
4.5.4.2 Changing the Modem Doppler Tracking Time
Softkey Type Description
Toggle 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.
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