The NAVERR command is used to specify the percent of errors allowed in a re
-
ceived message before the KAM’98 considers the message as not being received
properly.
If you wish to clear the message sequence numbers, allowing all messages to be
received again, use the NAVCLR command. If the Navtex mode is used infre
-
quently, it is advisable to clear the numbers, since the transmitting station may
have already wrapped sequence numbers back around to those you have stored.
Pactor Operation
Pactor operation is possble in two modes. The first mode, normally referred to as
ARQ mode, is a “connected” or linked mode where two stations are in conversa-
tion with each other. Complete error checking occurs in this mode and the receiv-
ing station will request retransmission of any data frames containing errors. The
KAM’98 uses memory ARQ in this mode to improve reception.
The second mode of operation transmits data in an unconnected (or unlinked)
state, allowing several stations to copy the transmission. This is referred to as the
FEC mode, and is the mode used for calling CQ or for other broadcast transmis-
sions. Receiving stations do not use memory ARQ to copy FEC transmissions;
therefore, a frame must be copied without any errors in order to be printed. You
might miss complete frames when receiving FEC broadcasts.
Monitoring Pactor FEC
To operate Pactor mode with your KAM’98, you must first go to the command
prompt. Type PACTOR and press return. This places your KAM’98 in Pactor
Standby mode, and the message “PACTOR STANDBY” is displayed on your ter
-
minal. NOTE: Since the MONITOR command is ON by default, your KAM’98
will now monitor any Pactor FEC or ARQ transmissions.
Calling CQ or Transmitting FEC
To call CQ, place your KAM’98 in the Pactor Standby mode by following the di
-
rections above. To begin transmitting, type <Ctrl+C>T. This keys your transmit
-
ter, the bargraph on the KAM’98 will go dark, and the HF transmit LED will
light up. Type in your CQ message, then type <Ctrl+C>E. Your KAM’98 will re
-
Non-Packet Modes of Communication Pactor Operation
User’s Guide 136 KAM’98 v 8.3
To Next Page
Loading...