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[aprssig] HF noise measuring campaign reports via APRS

Heikki Hannikainen hessu at hes.iki.fi
Fri Sep 14 19:09:37 UTC 2012


On Fri, 14 Sep 2012, Chris Moulding wrote:

> 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.

> Does anyone foresee a problem with this?

There's at least one small problem: there's no fixed identifier anywhere 
which would allow detecting that this is a telemetry packet from your 
software. It's just a status packet with some numbers there. A protocol ID 
string in the beginning of the data would make it possible for software to 
easily figure that hey, there might be noise level data in here.

> If anyone can think of a better way to do it I'm open to ideas.

If there's at most 5 frequencies monitored by a given station, you could 
transmit it as standard APRS telemetry, and it would be graphed 
automatically by all APRS receiving stations without any code changes in 
the receiving end. Like this:

http://aprs.fi/telemetry/a/OH7LZB-14

You can also transmit channel names for each graph.

   - Hessu




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