(on 2-meters) at 1200 baud. What you are about to do is enter a series of com
-
mands to switch the modem within the KAM’98 from 300 baud for HF packet
(which is where the modem is set when you turn your unit on the first time - at
which point you are at the command prompt, in Packet mode) to 1200 baud for
VHF packet use. In addition, you’ll adjust several packet parameters so that
packet operation on 1200 baud is optimal.
+
For more detail on these parameters and their commands, see the commands ref
-
erence.
Now, enter the VHF parameter values for the commands listed in the following
table:
+
For reference, these are the recommended parameter values for HF and VHF
packet operation (each of which is set by a command of the same name):
Commands
HF (default) VHF setting
hbaud 300 1200
mark 2125 1300
space 2295 2100
maxframe 1 4
paclen 64 128
persist 192 63
slottime 5 10
SWP 17,17,50 17,17,108
Now that you have converted your KAM’98 for VHF operation, connect a VHF
rig to the audio input of the KAM’98, and try copying some VHF 1200 baud
packets. Start by tuning the radio to 145.01 Mhz, the national packet frequency. If
you don’t find any activity there try 145.03, 145.05, or 144.390 (the national
APRS broadcast frequency.)
Since packet monitor is on (default setting) when you are in command mode,
there is no need to enter the MONITOR command to watch packets. You are al
-
ready there. Simply watch the screen for packets as you hear their characteristic
squawk.
Assuming you see some, it is time to move on to other topics or switch the
KAM’98 modem parameters back for HF activity. To switch the modem back for
Getting Started Switching to 1200 baud Packet (and back)
User’s Guide 110 KAM’98 v 8.3
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