[aprssig] APRS Local Info Initative TM-D710A compatibitility

Ron Stordahl, AE5E ronn5in-aprssig at yahoo.com
Thu Apr 26 23:31:02 CDT 2012

Hi Bob

I created the initial posting largely to point out the need to include the frequency offset in the object format for the case of UHF voice repeaters in order to enable the D710A to correctly QSY in as much as it appears it is not possible to program the standard offset in the D710A for UHF, which surprises me.

Now that you are present I would like to ask you to update the Local Info Initiative to include the offset format in the explanation so that sysops will begin to include it.  In my UHF example I show it as '+500'.  It probably requires a leading space and if something follows it perhaps a trailing space.  Please look at the original posting for the details of UHF and VHF offsets.  While it is not required for VHF, if included it must include a leading 0 for the current D710A firmware to process properly as I determined experimentally.

I will admit I am surprised by the reaction to my trying to avoid what I would consider 'unnecessary' clutter to APRS-IS through the addition of NOGATE to the packet, at a cost of 7 bytes.  I need to look at the AX.25 spec to satisfy myself on this point.

Ron, AE5E

> From: Bob Bruninga <bruninga at usna.edu>
>To: "'Ron Stordahl, AE5E'" <ronn5in-aprssig at yahoo.com>; 'TAPR APRS Mailing List' <aprssig at tapr.org>; 'Lynn W. Deffenbaugh (Mr)' <ldeffenb at homeside.to> 
>Sent: Thursday, April 26, 2012 8:43 PM
>Subject: RE: [aprssig] APRS Local Info Initative TM-D710A compatibitility
>> What I actually do is to send them locally with NOGATE 
>> every 10 minutes and then send one every 30 to 60 minutes to APRS-IS.
>I thnk I agree with Lynn.  There is no value in keeping 2 out of 3 of them
>off the IS.  Since the penalty for doing that is making everyone of the
>local packets 7 bytes longer on RF because of the NOGATE path.  And since RF
>is the most precious to preserve compared to the IS, then I think it woiuld
>be better not to use the NOGATE.  Simply no path...
>> On my recent road trip I heard voice repeater objects from 
>> several hundred miles away.  It could be that some sysops 
>> don't realize this is pointless.
>Amen!  I couldnt agree more.  And if you check , they are usually entered
>from some home station which then uses the h0ome station path and violates
>all of the suggestions about how to make this info get out with zero impact.
>Hang in there.  We all need to aggressively attac these objects one at a
>time, to shorten back the offensive ones, and promote them on all the digis
>that do not do them.
>Bob, WB4APR
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