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projecthorus / radiosonde_auto_rx

Automatically Track Radiosonde Launches using RTLSDR
GNU General Public License v3.0
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frequency correction? #844

Closed radiohound closed 5 months ago

radiohound commented 5 months ago

When my SDR hears a weather balloon on 404.000 mhz, it thinks the weather balloon is on 403.980 mhz. The signal is heard fine, its just an issue of reporting the wrong frequency. Is there a way in the software to correct for this reporting error?

Thank you,

Walter

darksidelemm commented 5 months ago

If you are using a RTLSDR, the station.cfg file has an option for a ppm offset setting: https://github.com/projecthorus/radiosonde_auto_rx/blob/master/auto_rx/station.cfg.example#L71

However, I'm wondering what SDR you are using that results in a 20 kHz frequency offset. I've found that most decent quality RTLSDRs (e.g. the RTLSDR v3 ones) are pretty much on-frequency from the factory.

radiohound commented 5 months ago

Thank you very much for your help. I was able to make that change to the config file. I am using an old DVB-T-DAB, only because I already had it. It's somewhat surprising that I was getting what I thought was pretty decent reception with it, although it's pretty far off frequency. I have purchased a RTL SDR V3 which I will get shortly, and will probably perform even better.