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[aprssig] FREQ Object Formats (FINAL COMMENT)

Bob Bruninga bruninga at usna.edu
Tue May 8 14:30:40 UTC 2012

Again, we are in violent agreement.  I am simply explaining how the APRS radios work and how they respond to NO offset, or BADLY FORMATTED offset info.  This badly formatted offset info is what is causing all this whoopla.  Understanding that the radios will then use the STANDARD offset (when they see bad formats) is what is causing all the additional problems and why poorly formatted junk APPEARS to work sometimes.

We are in violent agreement that transmitting the offset (IN PROPER FORMAT) will resolve any issues.

Bob, Wb4aPR

-----Original Message-----
From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf Of Georg Lukas
Sent: Tuesday, May 08, 2012 9:54 AM
To: aprssig at tapr.org
Subject: Re: [aprssig] FREQ Object Formats (FINAL COMMENT)

* Bob Bruninga <bruninga at usna.edu> [2012-05-08 15:35]:
> 1) in the USA, for standard offset repeaters then NO OFFSET IS NEEDED.

This implies a correct configuration of the radio _receiving_ the packet, however. It needs to consider where in the world it is located, what the default shift is for the according band and then to use this guesstimate.

Therefore, Lynn suggested to *recommend* to add the repeater shift into the comment even when it is the default value, at the cost of four bytes, to allow both software radios and radios imported from other parts of the world to operate as easily as local radios.

I second that suggestion, because at the end of the day, it makes implementing APRS easier for both software and hardware vendors.

> > That's just way to much of a guessing game. 
> No guessing about it. Pure facts on how the radios work, and the spec 
> covers all situations, if people would just do it right.  90% of the 
> OBJECTS on the air seem to ignore it and just randomly pick and choose 
> the data in their comments and then complain when it does not work...
> When they are the problem and not everything else that they point to.

By requiring the repeater shift to be added in every case, the spec could actually be made even simpler, allowing more people to properly format their frequency objects! :)

Just my 2¢ on the issue.

73 de Georg DO1GL
APRSdroid - Open Source APRS Client for Android ++ http://aprsdroid.org/m
     ++ https://market.android.com/details?id=org.aprsdroid.app ++

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