We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale.

Author Topic: UNID RS41 Radiosonde 402.5 MHz 1431 UTC 5 April 2019  (Read 294 times)

Offline ChrisSmolinski

  • Administrator
  • Marconi Class DXer
  • *****
  • Posts: 23902
  • Westminster, MD USA
    • View Profile
    • Black Cat Systems
UNID RS41 Radiosonde 402.5 MHz 1431 UTC 5 April 2019
« on: April 05, 2019, 1432 UTC »
Not sure where this is from or the mode... but a very strong signal. Now to figure out what kind it is.... This might be the one NJQA mentioned near 403 MHz? Nope! There is another on 403.0 MHz!

Update - It is a RS41. Perhaps the same one I observed on 402.3 MHz a few times last year.

The first frame was 4785 at 14:27:59 UTC, that implies a power on time of 13:08:14 UTC. The path looks similar to the end of the NWS Sterling launch from 1100 UTC, so perhaps it came from Dulles Airport as well.





« Last Edit: April 05, 2019, 1740 UTC by ChrisSmolinski »
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
NRD 545 / netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 670 ft horizontal loop / 500 ft northeast beverage / 58 ft T2FD / 300 ft south beverage / 43m / 20m / 10m  dipoles / Crossed Parallel Loop