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[aprssig] Radio behavior when receiving a frequency object

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Mon May 7 20:53:50 UTC 2012

What a radio does with a given frequency object is up to that radio's 
firmware, and that's what Bob is attempting to ascertain right now.  
However, the object you indicated only has a machine-readable frequency 
in it and the remainder is completely non spec compliant.

AB2ZO-2>APX200,WIDE2-1,qAR,K2MHV-6:;147.255WX*071408z4156.96N/07359.00WW147.255(+) Ulster Wx Net 0730, Mon - Sat

The object name is 147.255WX, that's good and provides the 147.255 

The comment starts with 147.255 - A completely redundant re-statement of 
the same information.  But the spec requires either FFF.FFFMHz or 
FFF.FFFrx to specify a receive frequency for the repeater.  If they had 
put the MHz on the 147.255 as many other frequency objects are doing, 
the spec would say it's a simplex repeater, both input and output on the 
same frequency.

The (+) is useless to any machine reader.  The spec requires a 
blank-delimited + to use the "standard" offset.  Or +060 would have been 
600KHz up for the split.  But nothing  that adheres to the spec pay any 
attention to the (+).

So, even if the radio had blanked itself out, the frequency object did 
not communicate enough information to be useful, beyond the original 

Oh, and Ulster in the comment is particularly redundant because the 
coordinates of the station tell you that!

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

On 5/7/2012 4:25 PM, Sander Pool wrote:
> Hi,
> as I was driving around town this morning I received a frequency 
> object for a WX net. My D710 parsed the frequency part of the object 
> when I pressed 'tune' but surprisingly it left the other radio 
> settings (shift and tone) intact. This seems like a D710 issue to me 
> but I figured I'd ask the APRS UG first. I would expect that when a 
> frequency object is used to setup a radio it starts by 'blanking' the 
> current settings and then updating them per the object.
> Here is the object in question:
> http://aprs.fi/info/a/147.255WX
> 73,
>     Sander W1SOP
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig

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