[aprssig] TEMPn-N and callsign digipeating

[VE7GDH]

Wes KD4RDB wrote...

<snip>

> On a side note, the other lesson learned was to set the slow speed on
> smart beaconing to 1mph.  That way as the busses creep forward in
> queue loading people, they'll be transmitting their new positions.

Changing the subject a bit from TEMPn-N... I hear what you are saying, but 
don't forget that often inaccuracy in your own GPS receiver will make it 
look like you are travelling faster than that speed even if completely 
stationary. I would probably set the slow speed to 5 kph and with the slow 
rate at 600 seconds. With the fast speed set to 50 kph and the fast rate at 
60 seconds, and with SmartBeaconing enabled, you would have most situations 
covered.  If it was truly stationary, it would beacon every 10 minutes. If 
it ever got up to 50 kph, it would beacon every minute. If it turned a 
corner, it would beacon.

That just leaves your scenario of creeping forward in a queue. If you set 
the slow speed to 1 mph, the tracker is going to beacon at the slow rate no 
matter what. You have really lost the advantage of SmartBeaconing. A 
compromise might be to nudge the slow speed up to say 5 kph but nudge the 
slow rate downwards from e.g. 10 minutes to something like 3 minutes. If the 
bus is truly stationary, it will beacon every 3 minutes. Whether it creeps 
forward or not, it will beacon every 3 minutes. If it is really moving, it 
would beacon more often and when turning a corner. If it was me, I wouldn't 
go that route. I would probably stick with 5 kph for the slow speed to 
(usually) eliminate the GPS from wandering in excess of your slow speed and 
with the slow rate set to 10 minutes. So what if you don't get to see the 
bus creep forward? e.g. you have 10 busses in a queue. One of them actually 
departs - it will beacon very soon either based on time or when it turns a 
corner. What tactical advantage to you have of seeing a bus move forward one 
(or 10) bus lengths? I'm sure you saw a need for it or you wouldn't have 
mentioned the intention to use 1 mph in the future. I just don't see it.

73 es cul - Keith VE7GDH
--
"I may be lost, but I know exactly where I am!"