Messages to the transceiver consist of commands. Most commands result in transmission of
an acknowledgment when the command has been received with a matching checksum.
Exceptions to this are the PTT command (no response).
PTT command has to be sent every 100 mS to keep PTT active.
Command messages containing frequency request that are not within the permitted airband
or illegal channel frequencies are ignored and not acknowledged.
The V16 provides two RS232 ports and one CAN bus. Only RS232 port 1 supports this
protocol. RS232 port 2 is reserved for special functions.
Frequencies
Frequencies are transmitted as 4 byte unsigned integer values in the RS232 protocol and 3
byte integer values in the CAN bus protocol,
Frequency values consist of MHZ and 100's of Khz plus a channel number within the 100Khz
band.
Values N=0-15 give the channel where channels 1,2,3,5,6,7,9,10,11,13,14,15 are 8.33Khz
channels and 0,4,8,12 are the 25Khz spaced channels.
Using published frequencies 8.33Khz channels from 0 to 15 correspond:
N
ICAO KHZ
0
0
0
25Khz bandwidth
1
5
0
2
10
8.333
3
15
16.666
4
25
25.000
25Khz bandwidth
5
30
25.000
6
35
33.333
7
40
41.666
8
50
50.000
25Khz bandwidth
9
55
50.000
10
60
58.333
11
65
66.666
12
75
75.000
25Khz bandwidth
13
80
75.000
14
85
83.333
15
90
91.666
Examples:
25Khz channel 127.175MHZ = 127112
8.33Khz channel 120.235Mhz = 120206 (actual frequency 120.233333 MHZ)
