Rohde & Schwarz M3SR Series 4100, Service Manual, Page: 71 / 138

Working Modes and Functions R&S M3SR Series 4100 HF Transceivers
2.1 6124.9007.82.01
2 Working Modes and Functions
2.1 General
The R&S M3SR Series 4100 150 W HF Transceiver covers the frequency range 1.5 to 30 MHz (TX)
and 0 to 30 MHz (RX). The output power (TX) is 150 W ±1 dB PEP, 100 W ±1 dB CW.
C A U T I O N
If the ERASE function on backplane connector X26 is not deactivated by the jumper
on X304 of the Motherboard, check the ERASE signal (or short-circuit connector) at
X26.6 and X26.44. These pins shall be connected together, otherwise the radio con-
troller will loose its mission-critical data.
2.2 Voice Communication
Voice transmission is possible in both digital and analog mode. Depending on the software
configuration, the transceiver is able to operate with signal modulations in the HF band as listed in
Table 2.1 (emission designators according to CCIR).
Table 2.1: Signal Modulations
Type of emission Abbreviation (old) Abbreviation (new, acc. to
WARC 1979)
Amplitude change signalling, no
modulation, Morse telegraphy CW A1A
Amplitude modulation, double
sideband and carrier AM A3E
Amplitude modulation, single
sideband and carrier AME H3E
Single sideband, upper side-
band, carrier suppression USB J3E+
Single sideband, lower side-
band, carrier suppression LSB J3E-