[aprssig] HF noise measuring campaign reports via APRS

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Sun Sep 16 14:37:36 EDT 2012

Have you considered using the user-defined data format packet instead of 
overloading the (supposedly humanly readable) status report packet?

See chapter 18 of aprs101.pdf.

Interested parties could still read raw packets for a station or use an 
APRS-IS filter of t/u (user defined) to pick them all up.

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

PS.  I hope I'm not too late to this discussion.  I've been a bit 
incommunicado recently.

On 9/14/2012 2:41 PM, Chris Moulding wrote:
> I'd like to add a feature in the SDR software to send the data by APRS 
> status report via the APRS-IS. It would also allow every ham with 
> access to APRS to view the noise data and run their own reports and 
> analysis.
> The data sent would be the RF frequency, peak noise level, the median 
> of the noise sampled over a period of time and the minimum noise level.
> At present I'm considering sending the data as a time stamped APRS 
> status report. For example:
> >141916z6.999,-100.1,-110.1,-120.1,10.100,-101.0,-111.0,-121.0
> In this example the first frequency is 6.999 MHz, the peak noise is 
> -100.1 dBm, the median is -110.1 dBm and the minimum is -120.1 dBm.
> The second frequency is 10.100 MHz, peak noise -101.0 dBm, median 
> -111.0 dBm and minimum -121.0 dBm.
>  The update rate would be say two status reports every 15 minutes so 
> that the changes in HF noise over the day can be recorded.
> With several stations recording data it would provide a very useful 
> reference over APRS to HF band noise conditions as well as providing 
> valuable long term data.
> Does anyone foresee a problem with this?
> If anyone can think of a better way to do it I'm open to ideas.
> 73,
> Chris, G4HYG
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