Paul Mullins pmullins at vk5vco.dyndns.org
Thu Sep 25 15:05:45 EST 2014

Hi there all,
I have a TT4 in the back of my car connected to a IC-1010, with a home / 
witches brew volt volt cut out, it monitors the rear battery and just 
turns off the TT4 and radio + GPS, in the program for the TT4 I heavily 
use smart beaconing, setup right works well, then when I stop for a long 
time it beacons a couple of times with-in the first 20 minutes, and then 
if I have not moved after that there is only 6 - 9 beacons per hour as 
it does not move, this works well in my case, and then the battery 
slowly gets to the cut off point about 12.8 v then dead until I start 
the car.

Now the TT4's do have a special feature in the software, just for this 
sitting in one place not doing a thing, it looks at the GPS sentence 
notes that it has not moved and swaps a pin high or low cant remember, 
to find it you have to CLI into the TT4, it is also tied up with the 
voltage set point, I know it is there got the writer to install it.

I feel a voltage drop out would do the job for him well, I have my drop 
out set high otherwise you can hear it squawking at nights if the volume 
is up on the radio, I have it set so I can just here it whilst driving, 
its funny when you are driving around in the middle of nowhere and all 
of a sudden you start hearing traffic.

I hope this gives an idea,

cheers all


On 25/09/2014 1:02 PM, Dom Dahl wrote:
> Hi all.
> I wonder if VK2TGB-7 parks his vehicle in a garage and the GPS losses 
> lock spasmodically.
> I know the most trackers have a setting to only transmit on valid GPS.
> On a different note why do you need to beacon every 2 minutes when 
> stationary?
> Cheers
> Dom
> VK2TGB-7 tends to jump around when stationary.
> Actually look at http://aprs.fi/info/?call=VK2TGB-7
> over 14000 km ???
> Its getting worse as time progresses ?
> Gary
> vk2zbb
> On 25-Sep-14 07:28, Owen Duffy wrote:
>     Hi All,
>     Corruption is commonplace in APRS.
>     This morning, looking at VK2TGB-7 which has been stationary for the
>     entire 48 hour history in aprs.fi <http://aprs.fi> and has
>     beaconed every 2 minutes (yes,
>     that is 2880 beacons for a station which did not move, repeated by
>     several digis into the Sydney region and until recently, gated from
>     APRS-IS back to RF by VK2ASY in Orange so that it travelled back via
>     Orange, Ginini and Illawarra/Southern Highlands digs to the Sydney
>     region again). Until Monday, I would hear each those posits 4 or 5
>     times, so on average a VK2TGB-7 packet very 25-30s... if VK2ASY ceases
>     his gating of this stuff to RF, it is an average rate of one posit
>     every
>     60s (via Vk2RHR-1 and VK2AMW-1)... and yes, for a stationary tracker.
>     But, one posit in those 2880 is interesting:
>     2014-09-24 03:09:34 UTC: *VK2TGB-7
>     <http://aprs.fi/?c=raw&limit=&call=VK2TGB-7>*>S3T2W3,WIDE1-1,WIDE2-1,qAR,VK2NR-5
>     <http://aprs.fi/?c=raw&limit=&call=VK2NR-5>:'N?9l <0x1c>>/ *[Duplicate
>     position packet]*
>     2014-09-24 03:11:34 UTC: *VK2TGB-7
>     <http://aprs.fi/?c=raw&limit=&call=VK2TGB-7>*>S3T0W3,WIDE1-1,WIDE2-1,qAR,VK2MB-1
>     <http://aprs.fi/?c=raw&limit=&call=VK2MB-1>:'N?9l <0x1c>>/
>     2014-09-24 03:13:34 UTC: *VK2TGB-7
>     <http://aprs.fi/?c=raw&limit=&call=VK2TGB-7>*>S3T2W3,WIDE1-1,WIDE2-1,qAR,VK2MB-1
>     <http://aprs.fi/?c=raw&limit=&call=VK2MB-1>:'N?9l <0x1c>>/ *[Duplicate
>     position packet]*
>     The middle one is a most unlikey position change... exactly one
>     character in the MICE encoded position changed. If this occurred
>     in the
>     AX.25 link, it should have been detected by bad CRC and
>     discarded... so
>     it has happened in the tracker, or in the iGate / APRS-IS
>     infrastructure
>     (and it is a single bit error in that case).
>     I have noticed certain stations (including VK2MB) commonly figure in
>     corruptions whereas others don't so it points to those stations as
>     probable corrupters.
>     Perhaps APRSdroid is the future, it bypasses all the problems inherent
>     in radio links and flawed digis and iGates!
>     Owen
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