Operating Manual 6175.4760.02 – 01 1.15
M3SR Series 4100 Communication Capabilities
Squelch Modes
The following squelch functions are incorporated:
• Carrier squelch RSSI (Receive Signal Strength Indication)
• Signal squelch (tone frequency selectable from a list)
• Syllabic squelch (voice-operated squelch)
• Squelch off
Embedded Digital Voice Services (only in optional R&S SECOM-H mode)
For digital voice transmission the following vocoders are implemented as software modules:
• The AMBE (Advanced Multiband Excitation) vocoder (plain digital voice) with a code rate
of 2400 bit/s.
• The MELP (Mixed Excitation Linear Prediction) vocoder with a code rate of 2400 bit/s
and 600 bit/s.
• The MMBE (Mixed Multiband Excitation) vocoder with a code rate of 2400 bit/s and
1200 bit/s.
1.8.2 Data Communication
The software-loadable modems provide for data communication in two modes:
• Fixed Frequency (direct FSK)
The data interface provides adjustable data rates in steps of 50 bit/s, 75 bit/s, 150 bit/s,
300 bit/s and 600 bit/s. The data interface works in transparent mode.
• Optional R&S SECOM-H (2.4 kbit/s)
R&S SECOM-H supports data rates of 300 bit/s, 600 bit/s, 1200 bit/s and 2400 bit/s with
FEC
• Optional HF Data modems
Several HF modems are available with SW option R&S GM4120S HF Modem.
Data rates from 75 bit/s up to 19200 bit/s are supported.
• Optional R&S GS4155S ALE-2G / ALE-3G with data protocols HDL/LDL
This SW option offers data transfer using the ALE-3G burst waveforms and an embed-
ded ARQ protocol.
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