SATEL-EASy+
User guide
Version 1.33
40
SATEL modem needs to have TX Delay 50ms or more in order to avoid messages from colliding
in case it is to be placed in a Pacific Crest system that uses addressing and acknowledging
scheme.
In case only broadcast messages are used (like in RTK applications) there is usually no need for
TX Delay, except if the transfer delays identical to Pacific Crest modems are preferred – in such
cases an appropriate value of TX Delay is 34 ms.
Note 1. SATEL-modems do not support Pacific Crest retransmit/acknowledge scheme. However,
that has no effect in RTK applications because they utilize only broadcast messages.
6.11.4 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.
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.
To Next Page
Loading...
