No. of retries (TP mode only)
If a received packet fails its CRC check, the receiving modem will ask for retransmission. For each packet, this will be repeated until either a good copy is received, or the number of retries set here has been reached. A typical setting is 10 - 15.
Max no. of bytes in a data frame (TP mode only)
The maximum number of bytes in each packet as it is transmitted. Select a value from the
Normally, the Orion will not transmit if the squelch indicates that there is already a transmission on frequency. However, where there is interference, this box may be checked to transmit regardless.
Inverted TX audio, Inverted RX audio
Some radio modules invert the audio (modem) TX and/or RX signal. Using these checkboxes, the signal can be restored to the original polarity by correcting the inversion.
Radio Baud Rate
Selects an
Sync Tolerance
Regular sync frames of known content are sent over the link. Sometimes they are imperfect, but because of forward error correction this does not indicate that the data is unusable. This value indicates the number of imperfections which can be tolerated, and is usually set at 4.
AT Commands Guard Time
Sets the minimum time in ms required to elapse either side of the ‘+++’ AT command string for it to be recognised as such. 15ms is a typical value. See p.21 for details.
ATI3 Test Message Interval
The time which is allowed to elapse in between transmissions of the test string in response to the ATI3 command, in tens of milliseconds.
1892 1335 - Orion Radio Modem Operating Instructions - v1.3 / Aug 2006 | 17 |