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[aprssig] HF noise measuring campaign reports via APRS

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Sun Sep 16 20:12:34 UTC 2012


That would seem to be Bob: http://www.aprs.org/aprs11/expfmts.txt

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

PS.  I just ran a t/u filter for about 30 minutes and only copied 
packets from WB9TLH-11 (Wa, Wb, Wc, Wd, and W3) and NN3A-3 (WB, WC, WD) 
all of which are prefixed with {, but none of which are listed on Bob's 
registration list.

On 9/16/2012 3:29 PM, Chris Moulding wrote:
> Lynn,
>
> Thanks for that suggestion. Having now read chapter 18 of APRS101.pdf 
> it makes sense to use a user-defined format rather than several status 
> messages.
>
> After discussion with the others involved in the project one option we 
> are considering is to send a single telemetry packet with a reduced 
> level of accuracy (0.5 dB) so that the median data of five RF channels 
> can be displayed graphically on aprs.fi. We can then also send a 
> packet (now in user-defined format) with the accurate (0.1 dB) version 
> of the data for the project data collection and analysis.
>
> I suppose the next question is who to ask to issue a User ID for the 
> user ID packet? I read that I can use {{ for testing.
>
> 73,
>
> Chris, G4HYG
>
>
>
> On 16/09/12 19:37, Lynn W. Deffenbaugh (Mr) wrote:
>> 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
>>>
>>> _______________________________________________
>>> aprssig mailing list
>>> aprssig at tapr.org
>>> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
>>>
>>
>>
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>




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