HFU HF Underground

Loggings => Satellite, Radiosondes and Other VHF/UHF Signals => Topic started by: ChrisSmolinski on April 30, 2013, 1228 UTC

Title: Possible radiosonde reception 1676 MHz
Post by: ChrisSmolinski on April 30, 2013, 1228 UTC
I may have received a radiosonde this morning. Even though the winds were not favorable, I decided to give it a try. I had a carrier on 1676 MHz starting at around 1205z. Then at around 1215z or so, I started to see modulation on it. I ran my app, and got 5 packets with a bad CRC (unfortunately I didn't enable the option to display bad CRC packets). Then after fiddling around trying to get an app running to record the audio, I went back to the waterfall, and the signal was completely gone.  So I am not sure what I had.

When the balloon bursts, how quickly does it fall? I'm wondering if I caught the signal when the balloon was at the maximum height? From the CUSF map it looks like it was south of DC.

For those interested, I was using my discone antenna feeding a Radio Shack Satellite pre-amp (950-2050 MHz) and an RTL dongle, running Gqrx under Mac OS X.

I'll need to be better prepared for next time.

Title: Re: Possible radiosonde reception 1676 MHz
Post by: w5cdt on April 30, 2013, 2121 UTC
Good deal Chris. I will see if I can find a contact at the Dulles NWS to confirm their operating frequency.
Ascent rate is about 5m/sec and I'm told descent is about 7m/sec. Next time I capture two descending packets separated by a few seconds I'll try to give you some hard data on that.