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[aprssig] HF noise measuring campaign reports via APRS

Heikki Hannikainen hessu at hes.iki.fi
Mon Sep 17 03:54:41 UTC 2012


By the way, a noticeable number of stations do seem to transmit 
floating-point values in telemetry. Our perl parser currently accepts 
them, I wonder how others treat them?

The 0...255 requirement seems to be designed for 8-bit decoders, I wonder 
if there are any of those around.

On Sun, 16 Sep 2012, Lynn W. Deffenbaugh (Mr) wrote:

> I agree that the standard APRS telemetry is definitely the preferable 
> approach, but since your example packet (below) showed 8 floating point 
> values of apparently some level of precision, I didn't suggest a format that 
> only supports 5 values ranging from 0 to 255 (per spec, but some say 0..999) 
> that can be scaled based on defined parametric equation coefficients.
>
>> 141916z6.999,-100.1,-110.1,-120.1,10.100,-101.0,-111.0,-121.0
>
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>
> On 9/14/2012 4:40 PM, Chris Moulding wrote:
>> Hessu,
>> 
>> Thanks for the information about the telemetry packets. That looks ideal 
>> especially when it displays in aprs.fi so well without any software changes 
>> at your end!
>> 
>> At the moment we are looking at three frequencies but with five telemetry 
>> channels available it might make sense to go with five frequencies from the 
>> start.
>> 
>> 73,
>> 
>> Chris, G4HYG
>> 
>>> 
>>> 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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>
>
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   - Hessu




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