[aprssig] Balloon - lessons learned (AVMAP-GPS) - GreenLight Labs GPS?

Amir Findling sarlabs at gmail.com
Mon Apr 7 20:26:58 CDT 2014


No, but having the collar on the balloon and the receiver/GPS in the chase
vehicle might work quite well, as the system is optimized to see current
dog/balloon position right on screen and be able to navigate towards it.

The drawback would be the small screen, but that should not really be a
problem.

-- 

73 de Amir K9CHP
Member ARRL, VE (ARRL and W5YI), WAC, WAS, DXCC
www.k9chp.net http://k9chp.blogspot.com
Liverpool Amateur Repeater Club www.W2CM.org
Eagle Valley Search Dogs www.evdogs.org
On Apr 7, 2014 4:58 PM, "Joe Dempster" <joe.dempster at gmail.com> wrote:

> Amir, are you telling us Bob got separated from the balloon search team,
> was lost for some time, and thus the dog collar recommendation?
>
> 73 de Joe K2EVK
>
>
> On Mon, Apr 7, 2014 at 3:57 PM, Amir Findling <sarlabs at gmail.com> wrote:
>
>> Talking to the father of APRS, you may perhaps want to see me burned at
>> the stake for heresy, but here is what I have to say:
>>
>> Maybe the Garmin Astro dog collar and base unit may work better just
>> because they are made to show the actual dog position. Not APRS, nor ham
>> frequencies... Might work though...
>>
>> --
>>
>> 73 de Amir K9CHP
>> Member ARRL, VE (ARRL and W5YI), WAC, WAS, DXCC
>> www.k9chp.net http://k9chp.blogspot.com
>> Liverpool Amateur Repeater Club www.W2CM.org
>> Eagle Valley Search Dogs www.evdogs.org
>> On Apr 7, 2014 12:32 PM, "Robert Bruninga" <bruninga at usna.edu> wrote:
>>
>>> See web page for summary of the balloon mission:
>>> http://aprs.org/balloons.html
>>>
>>>
>>>
>>> APRS Lessons Learned: -- What the  GPS map shows MAY NOT BE what your
>>> radio knows.
>>>
>>>
>>>
>>> We were running a GreenLight Labs GPS on the D710:
>>> http://www.greenlightlabs.com/gps-710/
>>>
>>>
>>>
>>> For the chase, we added an AVMAP GPS for the map display and plugged it
>>> into the "pass-through" socket on the Green light labs GPS.  Everything
>>> seemed to be working.
>>>
>>>
>>>
>>> 20/20 HINDSIGHT HINTS:  Occasionally we notice the D710 was not updating
>>> and so we cycled power and continued.  Some times the AVMAP was not
>>> updating.  Sometimes when the AVMAP was plugged into the Green Light Labs
>>> GPS, then the D710 did not get GPS updates.  But generally, a power cycle
>>> fixed it.  Did it maybe 3 times during the all day chase.
>>>
>>>
>>>
>>> PROBLEM:  What screwed us up was "assuming" that the balloon ICON
>>> SHOWING on the AVMAP GPS was the same last-updated balloon data showing on
>>> the Kenwood D710.  So we were visually driving and chasing the BALLOON ICON
>>> on the AVMAP not realizing that it was the 2nd from last actual
>>> position data heard.  But each time we LOOKED at  the data on the kenwwod
>>> we WERE seeing the last known position (looking mostly to see the
>>> altitude).  But you see, they were not the same.  Apparently the last two
>>> packets did not make it to the AVMAP.  So we were searching based on the
>>> time and altitiude on the radio and the visual map data on the AVMAP, not
>>> realizing they were different.
>>>
>>>
>>>
>>> Finally when I happened to compare LAT/LONG numbers on the radio, to our
>>> searching area, it was 7 miles to the east!
>>>
>>>
>>>
>>> And searching through the 150+ AVMAP APRS entries provided nothing to
>>> correlate the two.  (it shows no lat/long and the altitude it shows is the
>>> LAND elevation, not the balloon!)  And since I was completely trusting the
>>> balloon ICON on the GPS map display, I never noticed that the distance and
>>> bearing on the Radio was showing it 7 miles away.
>>>
>>>
>>>
>>> 20/20 Hindsight.  Always use the final data in the RADIO as the last
>>> known information.  It has to be right.  There may have been a transmission
>>> error between the radio and the GPS display.
>>>
>>>
>>>
>>> WB4APR, Bob
>>>
>>>
>>>
>>>
>>>
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>>> http://www.tapr.org/mailman/listinfo/aprssig
>>>
>>>
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