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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 2d

We have not listened to Juno. We only occasionally mount our X-band antenna in focus, so far we have only done that for Voyager-1 the Hakuto-R M2 Moon landing.
Juno's signal was strong, even detectable with 2m dishes, so some amateurs could try.
Maybe @amsat-dl.org (20m dish) has listened before.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 10d

Knap mistig in Dwingeloo!
Foto: Arno Schoenmakers.

Radiotelescoop Dwingeloo in de mist, met een zon die door de mist heen schijnt.

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Reposted by Radiotelescoop Dwingeloo

AMSAT-DL @amsat-dl.org · 19d

Thomas Telkamp, PA8Z, presented @radiotelescoop.bsky.social at the Bochum Space Days, and we just looked at Voyager-1 downlink signal with the ourv20m dish in Bochum again after first receive in 2006.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 26d

Morgen, zondag 14 september, is de telescoop open voor #openmonumentendag. In de vroegere directeurswoning, ook een monument, hebben we historische elektronica opgesteld. Wees welkom om van dichtbij te kijken!
Voor een rondleiding in de telescoop is een reservering nodig, via www.camras.nl

Een zaal met tafels met elektronica. Op de voorgrond een metalen constructie met een hoornantenne, die vroeger in de Dwingeloo telescoop zat.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Jul 6

Some passers-by at the telescope today.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Jul 5

Op zo 6 juli is de landelijke #zonnekijkdag. We geven demonstraties met de radiotelescoop, en een zonne-expert van ASTRON geeft een korte lezing. Er is bepaald geen blue sky voorspeld, dus misschien is de radiotelescoop wel de enige locatie waar we de zon live waarnemen. Reserveer via www.camras.nl

Ontdek de zon tijdens de landelijke zonnekijkdag, 6 juli 2025

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Reposted by Radiotelescoop Dwingeloo

AMSAT-DL @amsat-dl.org · Jun 5

Same in Bochum.. shortly after the end of braking and start of pitching maneuver.. 😢

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Jun 5

We have lost signal of Hakuto-R M2 Resilience! We saw the signal and its Lunar reflection close to each other before LOS, indicating that it was very close to the surface when the signal disappeared. Space is hard!

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Jun 5

We are now tracking the landing attempt of #Hakuto-R Mission 2 #Resilience. Check our livestream at www.youtube.com/live/C7-MQ2U...

Livestream CAMRAS Radiotelescoop

YouTube video by CAMRAS Radiotelescoop

www.youtube.com

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · May 25

An excellent thread with measurements of radio recombination lines with the historic Dwingeloo radio telescope. These are the first such measurements since the restoration of the telescope.

Thomas Telkamp @telkamp.eu · May 25

Measuring Radio Recombination Lines (RRL) with the Dwingeloo telescope (@radiotelescoop.bsky.social), in the Omega Nebula (M17/W38).

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · May 16

On the occasion of the @unesco.org International Day of Light, we created a 'light painting' using the Dwingeloo Telescope by mounting a light bulb at the focus for half an hour. #lightday2025 @idlofficial.bsky.social

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Reposted by Radiotelescoop Dwingeloo

Thomas Telkamp @telkamp.eu · May 15

Just listening to the Voyager 1 signal on a Wednesday evening. More than 23 light hours away (25 billion km). Of course with the historic @radiotelescoop.bsky.social!

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Reposted by Radiotelescoop Dwingeloo

Daniel Estévez @destevez.net · Apr 25

After fixing this mistake, the frequency difference is on the order of 1 Hz. This is about 0.7 ppb, so it is within the accuracy that we could expect for the GPSDO at Bochum. So mystery solved!

A plot with the same title as before: Frequency difference between Bochum and Dwingeloo (with Doppler for Mare Crisium subtracted). The curve is now different. It is a noisy ramp that increases from -1.75 Hz to 0.75 Hz.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Apr 22

Op zondag 27 april geven we weer demonstraties van de radiotelescoop Dwingeloo. Op het programma staat altijd live-signaal van onze 'huispulsar' B0329+54, meestal een ver sterrenstelsel, een supernovarestant of gewoon de zon. De ruimte is beperkt, dus reserveren is nodig, via www.camras.nl

Drone-foto van de Radiotelescoop Dwingeloo

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Reposted by Radiotelescoop Dwingeloo

Daniel Estévez @destevez.net · Apr 20

The signal can be detected both in the Dwingeloo and Stockert 25 m radio telescopes, but the performance of Dwingeloo is poorer. The observed Doppler spread is on the order of ±0.75 Hz, which is a bit less than the spread model I made.

Read more: destevez.net/2025/04/anal...

A plot of the power spectral density of the signal as received in Stockert and Dwingeloo. The plot is normalized so that the noise has mean zero and standard deviation one, so the detection values in sigmas can be read directly. There is a continuous trace showing the measurement of the PFB spectrum analyzer with 0.5 Hz bins, and a dashed trace that is a moving average of 5 of these bins.

A plot of the power spectral density of the maximum ratio combining of the signals at Stockert and Dwingeloo. The Doppler spread model is also shown for comparison. The model predicts a slightly larger Doppler spread than what observed in practice. As in the previous plot, the spectrum is normalize so that noise has mean zero and standard deviation one, and both the spectrum in 0.5 Hz bins and a moving average of 5 bins are shown.

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Reposted by Radiotelescoop Dwingeloo

Daniel Estévez @destevez.net · Apr 20

New blog post: Analysis of the CAMRAS Venus radar experiment. A deep dive into the Earth-Venus-Earth L-band radar experiment done in March by @radiotelescoop.bsky.social, Astropeiler Stockert, the Deep Space Exploration Society, and Open Research Institute. 🧵

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Reposted by Radiotelescoop Dwingeloo

Cees Bassa @cbassa.bsky.social · Apr 10

A bit late, but here is some additional analysis of the Earth-Venus-Earth radar experiments with @radiotelescoop.bsky.social from March 22nd, 2025. It takes the 4 recordings at the Dwingeloo and Stockert telescopes and searches in Doppler frequency and Doppler rates for the radar reflections.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Apr 1

The data we collected during our successful Earth-Venus-Earth experiment is now available at data.camras.nl/venus/, including an example notebook by @telkamp.eu showing how the reflection of our signal off the surface of Venus can be detected in this data.

Graph showing an Earth-Venus-Earth detection in one transmission transmitted with the Dwingeloo Telescope, received with the Stockert Telescope.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Apr 1

Oeps! Was haastwerk, zie tijdstip van de post ;) De telescoop kan vrij snel slewen, 1 graad per seconde, in dit geval snel genoeg. Maar omdat de capsule nog heel laag zat, was hij bij ons al op de horizon op het moment dat ze begon met zenden. Desalniettemin hadden we goede ontvangst op de horizon!

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Apr 1

Duitse astronaute Rabea Rogge is nu onderweg naar het ISS. Ze geeft 9:25 (nu dus) vanuit de capsule een interview aan de TU Berlin. Wij luisteren met de telescoop mee en stream naar websdr.camras.nl:8901?tune=437550fm . Livestream van de TU Berlin: www.youtube.com/live/qaL-D4d...

websdr.camras.nl

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Mar 29

De maan was vandaag niet de enige die een 'hapje uit de zon' nam. #zonsverduistering

Foto van een opblaaszon met een hap eruit, en de hond die die hap genomen heeft.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Mar 29

We hebben vandaag de gedeeltelijke #zonsverduistering ook met de radiotelescoop waargenomen. De periode dat de radioruis van de zon afnam doordat de maan ervoor zat, was iets langer dan de optische eclips. Dat komt doordat de radiogolven van de zon ook uit de corona rondom de zon komen.

Grafiek waarin te zien is hoe de radioruis van de zon afneemt tijdens een gedeeltelijke zonsverduistering.

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Reposted by Radiotelescoop Dwingeloo

Cees Bassa @cbassa.bsky.social · Mar 24

This was quite the project to have been involved in (if only minor). Thanks to @telkamp.eu and other volunteers at @radiotelescoop.bsky.social for doing the heavy lifting to make this extremely cool experiment possible!

Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Mar 24

We used the historic Dwingeloo telescope to bounce a signal off the surface of Venus, and receive its echo! This marks only the second time that amateurs have achieved an 'EVE' (Earth-Venus-Earth) bounce. Venus was about 40 million kilometers from Earth.
www.camras.nl/en/blog/2025...

Graphs showing EVE detections: 5.4 sigma for Dwingeloo-Dwingeloo, 8.5 sigma for Dwingeloo-Stockert, 9.2 sigma for combined Dwingeloo/Stockert

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Mar 24

We will make a write-up, may take a while. We recorded 1MHz, but the signal we sent was CW, and when integrated (taking Doppler and Doppler rate into account) it fell into a 1Hz bin. If I recall correctly, the Doppler drift during a 4m40 echo was about 30Hz.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Mar 24

The total travel time to Venus and back was 4 minutes and 40 seconds (that's two-way). We transmitted for 4m38s and heard our own echo from Dwingeloo, while also the Stockert telescope listened in and heard our echo.

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