SG-2000 MANUAL
61
The SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
©1995, SGC, Inc.
TEL: (206) 746-6310 FAX: (206) 746-6384
The SG-2000 comes preprogrammed with all standard marine
ITU and most SITOR channels (see ITU programmed
frequency chart). The SG-2000 has the capability to hold up
to 100 operator chosen channels in permanent memory.
MODE
Display of the current mode is in the upper right corner of
the LCD display. The mode operation button allows the user
to sequence through 4 modes of operations. The modes of
operations are:
1)
A3H: AM/AM compatible. On receive, this is the AM
mode and utilizes the SG-2000's true AM detector. In
transmit, the SG-2000 transmits compatible AM (sometimes
called AME, meaning AM equivalent) which is single
sideband with 40-50 W of the carrier re-inserted.
2)
A3J: Single Sideband. This is the most commonly used
method of voice transmission and is very efficient because all
the transmitter power is devoted to carrying voice
information. No power is wasted by transmitting a carrier.
3)
A3A: Single Sideband with pilot carrier. This mode
has a 4% pilot carrier reinsertion. This is commonly used
among public shore stations and ITU stations where the
carrier can be locked on and used by automated services.
4)
CW mode: This mode is used for key coded
transmissions. While in this mode the user can only transmit
a 1 KHz tone by either keying the microphone or Morse code
key.
These modes are sequenced counter clock-wise on the LCD
display and are stored with the current configuration when
the unit is turned off. Mode information may be stored as
desired in the channel memory which also stores transmit
and receive frequencies.
LSB - USB
The use of this button directs the transceiver to operate
either upper sideband (USB) or lower sideband (LSB). U.S.
and International Marine and Commercial regulations
require that only upper sideband be used in marine
frequency operation. Lower sideband may be used for
Government or special applications only. In the amateur
bands, frequencies on 40 meters (the 7 MHz band) and lower
have traditionally employed lower sideband.