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[aprssig] Object vs Item (was: Object Timestamps and 111111)

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Tue Dec 14 13:11:31 UTC 2010

The object format requires the timestamp.  The item format does not, 
however there seems to be some reason that Objects are used instead of 
Items.  Can anyone clarify that history?

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

PS.  APRSISCE/32's latest development release can now generate Items as 
well as Objects with all 3 time formats (DHM-z, HMS-h, and 111111z).

Al Wolfe wrote:
>    What about just turning off timestamps? It would make for shorter 
> packets. About 80 to 90 percent of the timestamps that I see are 
> wrong. It seems that most APRS users using timestamps don't know what 
> day it is or haven't mastered GMT offsets.
>    Can timestamps on tinytrak and wxtrak be turned off? They seem very 
> seldom to be close to reality.
> Al, K9SI
>> Date: Sun, 12 Dec 2010 16:36:06 -0500
>> From: "Lynn W. Deffenbaugh (Mr)" <ldeffenb at homeside.to>
>> Subject: Re: [aprssig] Object Timestamps and 111111
>> Ok, so that's where the 111111 came from.  Is it actually written down
>> somewhere that new APRS implementations can learn about it?.
>> What about the h format vs the z format, both of which seem to be valid
>> according to aprs101.pdf?
>> And what does the timestamp actually MEAN?  Is it simply a timestamp of
>> the object's transmission?  a date/time that the object is particularly
>> interested in?   an expiration time?
>> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
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