[OZAPRS] MICE usage
vk2ycj at bravo.net.au
vk2ycj at bravo.net.au
Thu Sep 25 17:34:56 EST 2014
This is one way:
Rod Coster - VK2TGB / VK2BNR
36 Green Parade
VALLEY HEIGHTS NSW 2777
Jamie VK2YCJ
> Look at his stuff on aprs.fi.
>
> I personally wonder why he is even running aprs...
>
> now he had a moving digi the other day (-6)...
>
> Anyone know him to contact ?
>
> On 25-Sep-14 13:32, 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
>> <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
>> <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
>> <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
>> <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
>> <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
>> <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
>> <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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