SATELLINE-EASy / SATELLINE-EASy 869
User Guide, Version 3.0
34
5.10.4
Transmission delays
The original SATELLINE-3AS is the fastest mode – the transfer delays are presented Appendix B.
In the PacCrest-4FSK, PacCrest-GMSK and Trimtalk450s modes the whole message is first read
from the serial port. The end of the message is detected when there is a pause in data. After that
data is framed and transmitted over the radio. Likewise the reception is done fully before
outputting the message to the serial port.
Symbol rates of the compatibility modes
The actual raw data rate is appr. 2/3 of the symbol rate.
Compatibility mode Symbol rate on 12.5 kHz channel Symbol rate on 25 kHz channel
PacCrest 4FSK
9600 bps
19200 bps
PacCrest GMSK
4800 bps
9600 bps
Trimtalk450s
4800 bps
9600 bps
PacCrest FST
9600 bps
19200 bps
The typical latency vs. the size of a message is shown in the tables below for each radio
compatibility mode. The delays are measured from the end of transmitted data to the end of
received data on the serial interface.
Pacific Crest 4FSK mode on 12.5 kHz channel - Transfer delays
Bps
1 byte
10 bytes
100 bytes
500 bytes
9600
74 ms
82 ms
302 ms
1293 ms
19200
73 ms
77 ms
249 ms
1031 ms
38400
72 ms
74 ms
222 ms
900 ms
Pacific Crest 4FSK mode on 25 kHz channel - Transfer delays
Bps
1 byte
10 bytes
100 bytes
500 bytes
9600
43 ms
51 ms
208 ms
911 ms
19200
41 ms
46 ms
155 ms
650 ms
38400
39 ms
43 ms
127 ms
519 ms
