Tried today at 11:47 according to schedule and 25 minutes after 12:57 without any signal.
What exactly does “~” mean after a start time without a following end time?
If a message does not come for 2min, the APRS will end. There is no end time because it is not known when it will end.
I don’t understand that.
If there is no end time, why is there a start time?
Does that mean that APRS is always ready to digipeat?
If I understand it correctly I think it works like this…
- The transponder turns on at the scheduled start time for a pass and a 2min countdown timer starts.
- If a message is received within the 2 mins the scheduled message is sent and the countdown timer reset.
- This continues until 2 minutes elapse without an incoming message being received when the countdown timer hits 0 and the transponder turns off.
- The transponder is then off until the next scheduled start time on a different pass.
They can’t give an end time because it will depend on incoming messages being received in a 2 minute window. The transponder could be active for only 2 minutes if no message received in the first 2 periods, for 3 minutes if only a message received after 1 minute then none for 2 minutes, etc. It depends when the incoming messages are received. I guess theoretically if an incoming message was received every 1 minute 59 seconds after the start time the transponder would stay active indefinitely.
What it also means is that if a message isn’t received within the first 2 minutes of the start time the transponder will turn off and be unavailable for the rest of the pass so it needs somebody in the footprint of the satellite at the start time to send a message or people further along the pass won’t have a chance to work the satellite.
Of course I could be completely wrong but I think that is what they mean about the 2 minutes interval and why they are unable to give an end time.
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This is SAKURA’s weekly schedule from 9/30~10/06.
※Schedules are subject to change depending on operational conditions.
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That’s correct!
This is SAKURA’s weekly schedule from 10/07~10/13.
※Schedules are subject to change depending on operational conditions.
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Keep in mind that, as long as SAKURA sends the “si” beacon type, it cannot stick to the schedule because it has no accurate time.
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I want to ask about “User query” mode.
- Which “APRS query” will Sakura respond to?
- If a query does not come for 2min, 2m TRX will OFF?
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