R&S M3SR Series 4100 HF Transceivers Voice Communication
6124.9007.82.01 2.2
Squelch Modes
The following squelch functions are incorporated:
¾ Carrier squelch RSSI (Receive Signal Strength Indication)
¾ Signal squelch (tone frequency selectable from a list)
¾ Syllabic squelch (voice operated squelch)
¾ Squelch off
Embedded Digital Voice Services (only in optional R&S SECOM-H mode)
For digital voice transmission two vocoders are implemented as software modules:
¾ The AMBE (Advanced Multiband Excitation) vocoder (plain digital voice) with a code rate of
2400
bit/s.
¾ The MMBE (Mixed Multiband Excitation) vocoder with a code rate of 2400 bit/s.
Single sideband, upper side-
band, modem operation
Modem operation USB J2D+
Single sideband, lower side-
band, modem operation
Modem operation LSB J2D-
Frequency modulated carrier,
voice transmission
FM F3E
Frequency modulation, FSK
(Frequency Shift Keying), mo
-
dem operation
FSK F1D
Amplitude modulation, inde-
pendent sideband, acc. to MIL-
STD188-110B, app. F
ISB B8E
Amplitude modulation, inde-
pendent sideband, modem op-
eration, acc. to MIL-
STD188-203
Modem operation ISB B7D
Type of emission Abbreviation (old) Abbreviation (new, acc. to
WARC 1979)
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