[OZAPRS] FW: Was Something is wrong, this is a fixed location....Now, we fixed it..

[Geoff Gatward]

You're not running a KPC3+ as the IGate TNC are you??   there is a well
known issue with these things in KISS mode introducing several minutes
worth of delay into packet processing - they are not recommended for use
on APRS for this reason.....   
(Currently the topic of an on-going thread on the APRS-SIG list)

Regards,
Geoff

On Wed, 2011-03-09 at 20:33 +1000, Gordon Taylor wrote:
> The issue of duplicate packets and speeds in excess of 500kmh have
> been fixed in my area.
> 
>  
> 
> Some troubleshooting by Dave VK4UN has shown that whenever my Igate
> was running the duplicate packets and excessive speed changes occur.
> With my Igate disconnected from the internet we confirmed all was good
> as I drove from Brisbane to Buderim this afternoon.
> 
>  
> 
> We employed that well known and often used Windows troubleshooting
> technique of rebooting the Igate.  This has fixed the problem.  Below
> are two packets that demonstrate the issue I had.
> 
>  
> 
> It is clear that the packet through VK4OG-1 was gated  nearly 6
> minutes before the packet through VK4VP-1.
> 
>  
> 
> I assume the time stamp is added when the packet is received not when
> it is transmitted, which in the telemetry and SCADA world I work in,
> is just not on.  Our systems always time stamps event as they occur so
> that any delays in the comms network do not compromise the credibility
> of the data, as has happened here.  I am not complaining just
> highlighting that this is an issue.
> 
>  
> 
>  
> 
>  
> 
> 2011-03-09 03:49:40 UTC:
> VK4VP-7>R7R4X6,VK4RBR-3*,WIDE2-2,qAS,VK4OG-1:`Q]/ }WK\]"3t}=
>    type: location
>    srccallsign: VK4VP-7
>    dstcallsign: R7R4X6
>    latitude: -27.41433333333333 °
>    longitude: 153.0865 °
>    course: 359 °
>    speed: 90.74799999999999 km/h
>    altitude: 2 m
>    symboltable: \
>    symbolcode: K
>    mbits: 101
>    posresolution: 18.52 m
>    posambiguity: 0
>    comment: ]=
> 
>  
> 
>  
> 
> 2011-03-09 03:55:01 UTC:
> VK4VP-7>R7R4X6,VK4RRC-13*,WIDE2-2,qAS,VK4VP-1:`Q]/ }WK\]"3t}=
> [Duplicate position packet]
>    type: location
>    srccallsign: VK4VP-7
>    dstcallsign: R7R4X6
>    latitude: -27.41433333333333 °
>    longitude: 153.0865 °
>    course: 359 °
>    speed: 90.74799999999999 km/h
>    altitude: 2 m
>    symboltable: \
>    symbolcode: K
>    mbits: 101
>    posresolution: 18.52 m
>    posambiguity: 0
>    comment: ]=
> 
>  
> 
>  
> 
> Regards,
> Gordo VK4VP
> 
>  
> 
> 
> _______________________________________________
> OZAPRS mailing list
> OZAPRS at aprs.net.au
> http://lists.aprs.net.au/mailman/listinfo/ozaprs