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m4a5a_v320_eng (14.02.2013)
- 20 -
Kompetent für Elektroniksysteme
m4a5a_v320_eng (14.02.2013)
- 21 -
Kompetent für Elektroniksysteme
Status
The status of the call is programmed in register 054 (digit 3). For decoding the status is not
important. All values are accepted.
Producer Identification and Call
Digits 4 and 5 (producer identification) and 6-8 (call) are combined by the Major and treated like a
5-tone sequence. Hence, call encoder and decoder are programmed in the same way as for the 5-
tone sequence.
Hash Key Identification for Calls
The 1-digit hash key identification is programmed in register 090 (digit 5). For decoding all values
are accepted.
Threshold Number
While 5-tone-decoder and FFSK-decoder are active simultaneously, it has to be decided before a
call if a 5-tone-telegram or an FFSK telegram is to be sent. The decision depends on the value of
the call (three last numbers of the FFSK telegram). Below a certain threshold number one telegram
type is used, aboce this number the other is used.
The threshold number is set in register 090 (digits 1-3). The 4
th
digit defines if a FFSK or tone
sequence is used below the threshold number. If it is coded with 0, FFSK is used below the
threshold number and starting with the threshold number tone sequences are used. The reverse
case is achieved by programming ‘1’.
Example 1:
Below the threshold number 51 tone sequences are to be sent, while FFSK signals should be sent
above it.
Register 090 0511xxxx
contains the threshold number 051 and a ‘1’ at digit 4 to enable FFSK
starting at the threshold number.
Example 2:
If only FFSK signals are to be sent, the threshold value is set to ‘000’ and digit 4 is set to ‘1’.
Register 090
0001xxxx
Example 3:
Only tone sequences are sent. Threshold number is again set to ‘000’, but this time digit 4 is set to
‘0’.
Register 090
0000xxxx
(factory default)
Summary of Contents for Major 4a
Page 1: ...Major 4a Major 5a ...