Tuning in the Signals
When operating most of the HF non-packet modes, use the bargraph on the front
of the KAM’98 as your tuning indicator. For RTTY, ASCII, AMTOR, Packet,
Pactor, and G-TOR operation, a properly tuned signal will light the two outside
LEDs on the bargraph. The left end of the bargraph is the MARK LED and the
right end is the SPACE LED. As signals are received, these two LEDs should
light with approximately the same brilliance.
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Set your radio in lower sideband (LSB) mode to perate RTTY, ASCII, AMTOR,
PACTOR, or G-TOR.
When operating CW, the MARK LED will light when no signal is present, and
when a tone is received, the bargraph should move quickly and completely to the
SPACE LED. Slow movement toward the SPACE LED indicates that you are not
tuned properly on the CW signal.
AMTOR Operation
With your KAM’98, several modes of AMTOR operation are possible. Each
AMTOR station is identified by a SELCAL (Selective Call) which is derived
from your amateur callsign. The accepted practice in AMTOR is to use the first
letter of your callsign and the last three letters of your callsign as your AMTOR
SELCAL. The KAM’98 will automatically assign you SELCAL using this
method, but you may change it by using the MYSELCAL command. In addition,
the KAM’98 supports a 7-character SELCAL and generates a unique SELCAL
for this mode from your callsign. The KAM’98 will accept a link from another
station calling you with either the 4-character or 7-character SELCAL.
Mode A AMTOR is called ARQ and is a connected mode allowing you to com
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municate with just ONE other station at a time. The two stations send data back
and forth at a rapid interval (every 450 milliseconds); therefore, this mode re
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quires radios capable of switching from receive to transmit and back very rapidly.
Relay-switched radios typically cannot operate Mode A AMTOR.
Mode B AMTOR is called FEC. This mode broadcasts continually, allowing si
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multaneous reception by several stations. Since there is no back-and-forth trans
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mission between stations, the switching speed of the radios is not significant. A
Non-Packet Modes of Communication Tuning in the Signals
User’s Guide 116 KAM’98 v 8.3
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