M3SR Series 4100 Changing the Modem Tx Level Control Blocks
4.138 Operating Manual 6175.4760.02 – 01
4.5.4.5 Changing the Modem Tx Level Control Blocks
Softkey Type Description
Editor 1. Press 'TLC Blocks' softkey.
2. Enter desired Tx modem level control
blocks.
3. Press 'ENT' to confirm.
Possible values:
for S4539: 1 to 7
By means of this function the operator can
change the number of modem Tx level control
blocks used at the beginning of a transmis-
sion. Those additional data probes in front of a
transmission enable the radio TLC (transmitter
level control) as well as the radio and modem
AGC (automatic gain control) to settle the sig-
nal level without disturbing payload data.
This parameter should be increased if the
used gain control attack time (e.g. from a third
party radio or modem supplier) is long. The
STANAG 4539 implementation in the Rohde
& Schwarz radio has been optimized, thus for
homogenous Rohde & Schwarz equipment a
value of 1 is recommended.
This parameter is adjustable for HF Modem
type STANAG 4539 only.
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