The audio I/O ports on a radio enable it to be connected to RTTY modems. With the audio I/O port on the
SG-2000, you can easily send and receive data communications from other stations.
Because of fading and static crashes, AGC is necessary to keep the volume of the
receiver somewhat constant. Otherwise, the fade or static crash would suddenly blast
through, and either make listening unpleasant or force you to keep your fingers on the
volume control.
Very short, very loud interfering signals can be quite annoying when listening to the radio. The noise blanker
silences the receiver during very brief periods when a sudden blast of noise appears. The
receiver immediately turns on again and everything happens so quickly that you can't even
tell that the receiver was turned off momentarily. The noise blanker isn't effective against
long, loud noises because all of the sound is muted equally.
The difference in frequency between the receiver and transmitter is the frequency offset. In some transceivers,
you can set the receiver frequency and the transmitter frequency separately, then there is sometimes a great
frequency offset. In other cases, such as the difference between a CW receiving and transmitting frequency, the
offset is very small.
With the PTT transmitter function, you can push a button on the microphone and turn on the transmitter until
you let go or unhook the switch.
38
The SGC Building, 13737 S.E. 26th St. Bellevue, Washington 98005 USA
P.O. Box 3526, 98009 Tel: (425) 746-6310 Fax: (425) 746-6384
© 1997 SGC Inc.
AGC (AUTOMATIC GAIN CONTROL)
Automatic Gain Control (AGC)
keeps receiver signal constant
to compensate for fading and
propagation variations.
AUDIO I/O PORTS
NOISE BLANKER
Noise Blanker.
Eliminates very
short, very loud
interfering signals.
FREQUENCY OFFSETS
PTT (PUSH-TO-TALK TRANSMITTER)
To Next Page