KD7LMO - Flight Tracking


ANSR DVD Media Track Flight Tracking Time Slots Repeater Student Projects

Time Slots

All the APRS Beacons operate on the same frequency. To avoid collisions, they transmit at predefined times during each minute by use the current time in seconds to determine when to transmit. This reuse of the same frequency based on time is known as TDMA (Time Division Multiple Access) and is used for common standards such as the GSM cell phones.

The following table contains the current time slot configuration for the APRS tracking beacons and their respective software version. The software version of the beacon may be determined by monitoring the APRS frequency during Beacon turn on. During startup, the payload transmits a status message that contains the software version information.

Time (Seconds)	Callsign	Payload	Software Version	Notes
0	KD7LMO-11	APRS Beacon	1.1	Payload Status Message
5	KD7LMO-11	APRS Beacon	1.1	MIC-E Packet
10	KD7LMO-11	Cross Band Repeater	1.12
15	KD7LMO-11	Cross Band Repeater	1.12	KD7LMO-0 Landing Prediction
20	KD7LMO-11	Cross Band Repeater	1.12
25	KD7LMO-11	APRS Beacon	1.1	MIC-E Packet
30	KD7LMO-11	APRS Beacon	1.1	Payload Status Message
35	KD7LMO-11	APRS Beacon	1.1	MIC-E Packet
40	KD7LMO-11	Cross Band Repeater	1.12
45	KD7LMO-11	Cross Band Repeater	1.12	KD7LMO-0 Landing Prediction
50	KD7LMO-11	Cross Band Repeater	1.12
55	KD7LMO-11	APRS Beacon	1.1	MIC-E Packet

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