[aprssig] Proper TT3 Setup
ron.tonneson at gmail.com
Tue May 13 12:27:49 CDT 2008
I solved the lack of a beacon when you stop with a pushbutton switch, of course it is not automatic. I mounted a small
normally open pushbutton switch in the housing of the radio cable. It is connected to PTT IN (pin 8) and ground.
whenever I want a beacon I just push the button. This of course will not work if you are using the PTT IN for its
Ron - K0QVF
Wes Johnston, AI4PX wrote:
> One of my annoyances of the smart beaconing is that it does not beacon
> when you stop moving.
> Smart beaconing on the TX side of things and dead reconing on the RX
> side of things are both GREAT. As long as smart beaconing sends a
> position periodically and when a change in direction or significant
> change in speed happens. The emphasis in smartbeaconing seems to be
> only on turning, not on delta velocity.
> Smart beaconing seems to always TX once I start moving, but what happens
> when I'm scheduled to beacon in a mile, but stop moving (ie break down
> on side of road)? My tracker will wait 10 minutes to beacon at which
> time the dead reconed position will have me 10 miles down the road
> (assuming last beacon sent was at 60mph).
> I've mentioned this here before... it would be nice if the smart beacon
> included one squawk at the point that you cross below slow speed
> threshold. That way the home audience wouldn't have to wait 10 minutes
> to figure out that I've stopped on the side of the road.
> In fairness, under normal driving conditions, you drive into a parking
> lot and turn sharply into a parking space triggering a beacon.... or you
> parallel park by backing up causing a beacon.
> So far I've tackled this problem with the open trak by making it change
> to profile 2 and beacon when velocity <1mph or GPS fix is lost. It
> switches back to profile 1 when velocity >5mph and GPS fix is valid.
> This hysteresis allows me to inch up at a stop light w/o QRM'ing.
> Ohh and one more note... We once put trackers on city busses used in an
> evacuation drill. I used smart beaconing for them. I had set the low
> speed threshold to something around 5mph. Well the busses pulled into
> the staging area off the main street an beaconed. This put them on the
> map way in the back of the parking lot. As we loaded them, the busses
> in the rear crept forward very slowly, never exceeding 5mph, so on the
> map they looked like they were still all out at the main road. Waiting
> 10 minutes for them to beacon seemed like an eternity when trying to
> explain to the officials why the bus was being loaded but still looked
> like it was deep in the parking lot. Lesson learned here was to set the
> low speed setting to 1 or 2mph. I had been in the habit of using 5mph
> from having used GPS when SA was on and the GPS would drift in a good
> sized area, often reading a few mph erroneously. Today, you can trust
> the velocity averaging to stay at zero.
> On 5/13/08, *Bob Burns W9RXR* <w9rxr_ at rlburns.net
> <mailto:w9rxr_ at rlburns.net>> wrote:
> At 07:51 AM 5/13/2008, Matt Murphy wrote:
> I have set it up with "Wide2-1" (too many? not enough?) and
> turned on smart beaconing.
> Bruce gave you some good advice regarding the CornerPegging feature
> of SmartBeaconing.
> According to the TT3 manual, you can configure both the Minimum Turn
> Angle and the Minimum Turn Time. The angle is the minimum change in
> direction required to trigger a beacon. As Bruce states, you don't
> want that to be too small, probably no less than 15 degrees.
> The time is the minimum time between beacons generated by the change
> in direction. Let's say you are driving around in circles (looking
> for a parking spot at Dayton, no doubt <g>). If your Minimum Turn
> Angle is set to 15 degrees, you will send out 24 beacons by the time
> you make a complete circle. But the CornerPegging routine also looks
> at the Minimum Turn Time to decide whether or not it's too soon to
> send out another beacon. If you set that parameter to, let's say 30
> seconds and it takes you 2 minutes to complete the circle, you will
> only send something like 4 beacons rather than 24.
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