How to view telemetry on aprs.fi

[ktktma123]

Hello,

I'm using a MicroTrak AIO ver3.2 that sends out APRS packets including my balloon coordinates. I can view the balloon's location on aprs.fi.
The user manual also mentions that this module can also measure battery voltage and temperature, so this is what I can see on aprs.fi:


The thing is these are not meaningful voltage and temperature values. They are probably a analog value that is later fed into an ADC or something. Does anyone have any experience on how to convert these values into meaningful measurements for voltage and temperature? Any help would be appreciated!

Thank you very much!

 

[AK9R]

It's my understanding that the telemetry sent over APRS has to be scaled in order to be meaningful. It's also my understanding that stations that send APRS telemetry occasionally send a beacon with the scale factors. The scaling is necessary because of the limited number of bytes available in an APRS packet.

Here's a link to the APRS 101 protocol reference: https://www.aprs.org/doc/APRS101.PDF Discussion of telemetry starts on page 78 in the PDF.

Have you tried contacting Byonics about this?

 

[KB3KBR]

see : Telemetry - APRSISCE/32 The future of Amateur Radio APRS

and : TT4 Telemetry - APRSISCE/32 The future of Amateur Radio APRS

Lynn did a very good write up.