4.7.2018 - N3140812 - Praha - 12UTC

GElog, príspevky do GElogu, nájdené sondy...
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astrohardy
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4.7.2018 - N3140812 - Praha - 12UTC

Príspevok od užívateľa astrohardy » 8. Júla 2018, 07:59

Typ sondy: RS41
HW: N3140812
Frekvencia: 401.1 MHz
Miesto vypustenia: Praha (WMOID:11520)
Dátum a časvypustenia: 4.7.2018 13:15
Dátum a čas nálezu: 30.11.-0001 0:00
Posledné súradnice LAT LON: 50.093305 14.454283 ALT: 257m
Súradnice nájdenia LAT LON: 50.09311 14.45392 Google maps


astrohardy
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Re: 4.7.2018 - N3140812 - Praha - 12UTC

Príspevok od užívateľa astrohardy » 8. Júla 2018, 08:03

Hi
Last week I was in Prague for a conference. I brought an RTL-SDR and a selfmade 1/4 lamda antenna for all cases. I realized that last week the sondes were landing very close to the launch site Prague Libus. I saw N3140812 landing directly in the city, computed a Tawhiri prediction and decided to quickly board the metro to rush to the site at the road Křižíkova. Directly at my prediction site I saw a young man apparently searching for something. "Looking for the radiosonde?" I asked him, and Jiri said "yes". He had arrived at the site 5 minutes after landing (me perhaps 25 minutes), and he had already discovered the balloon hanging in a tree. He had a receiver and a yagi antenna in his bag but there was no transmission from the sonde any more.

Obrázok

The line had been torn apart and was hanging in the tree, but there was no sonde. We quickly joined forces to search the area. Jiri emphazised that I should sign up for radiosonda.sk :D We asked some workers on a construction site. We looked for any part of the cord hanging from other trees or from the roofs. No joy. After some time we gave up. He went home and I returned to the metro station. After some steps down the road I saw this at the bank of the road:

Obrázok

I recovered everything, but the batteries and the sensor arm were missing. Obviously a car had hit the sonde directly after landing and ripped it off the balloon rest.


Cheers
Hartwig

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CZJKP1
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Bydlisko: Praha 5 (loc: JO70EA). Občas okr. Mělník (loc: JO70FK)

Re: 4.7.2018 - N3140812 - Praha - 12UTC

Príspevok od užívateľa CZJKP1 » 8. Júla 2018, 14:05

Congratulation.

My picture is here

Jiri
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20180704_154631.jpg

astrohardy
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Re: 4.7.2018 - N3140812 - Praha - 12UTC

Príspevok od užívateľa astrohardy » 9. Júla 2018, 13:09

It was nice to meet you there, and I am just a bit sad that we did not find the sonde together after that joint search. Anyway I think you can regard this find as a joint one.

I directly passed the point when I came from the metro station and did not notice it. And you also did not see it although you came much earlier and had better landing data. OK, we extended our search in the wrong direction, but we should have found it before that within minutes. Maybe the sonde was hidden by or below a parked car when we arrived, and that car eventually drove away, making it easy for me to spot it on my way back. Just a speculation. In fact some parts of the sonde were still below a parking car when I found them, and maybe sensor arm and batteries, which I could not find, were still below that car.

Good luck with your future finds.

Hartwig

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