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[aprssig] HF noise measuring campaign reports via APRS

Chris Moulding chrism at crosscountrywireless.net
Sun Sep 16 19:29:13 UTC 2012


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
>>
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>
>
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