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Thomas Telkamp

@telkamp.eu

140 followers 230 following 26 posts

Satellites, Radio Astronomy, SDR, Signal Processing, GPU. CTO Lacuna Space. Dwingeloo Radio Telescope.

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Thomas Telkamp @telkamp.eu · 3d

In the graph on the laptop screen you see a small peak, this is the carrier transmitted by Voyager 1, that took more than 23 hours to reach us.

Thomas Telkamp @telkamp.eu · 3d

Receiving Voyager 1 just two weeks ago at Sternwarte Bochum and @amsat-dl.org!

Thomas Telkamp @telkamp.eu · 13d

As shown by @coastal8049.bsky.social, nice rotational Doppler on IMAP.

Frequency of IMAP signal as received in De Bilt.

IMAP offset from expected frequency.

Thomas Telkamp @telkamp.eu · 18d

It was a great day! We tracked Voyager-1 Doppler for more than 4 hours. During that time, it stayed well within 1 Hz of predicted values from the published trajectory.

Voyager-1 Doppler measured in Bochum.

Reposted by Thomas Telkamp

AMSAT-DL @amsat-dl.org · Jun 5

We lost HAKUTO-R M2 signal suddenly

Reposted by Thomas Telkamp

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!

Reposted by Thomas Telkamp

Thomas Telkamp @telkamp.eu · May 25

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

H116⍺ RRL as measured in Dwingeloo.

Thomas Telkamp @telkamp.eu · May 25

At even higher excitation levels (n=252) we can measure the radio emission in the UHF band (408 MHz).

Thomas Telkamp @telkamp.eu · May 25

These lines are weak and take a long integration time (30 minutes+) to become visible. For comparison, this is the H167⍺ RRL at M17 at the same scale as the neutral Hydrogen (HI) profile at M17.

Thomas Telkamp @telkamp.eu · May 25

They are essentially the radio counterparts of the Balmer series of lines (n=2), which are visible light lines. In L-band we can detect 4 of these lines, from different energy levels.

Thomas Telkamp @telkamp.eu · May 25

These are spectral lines in the radio spectrum that arise from the transitions of electrons between high energy levels in atoms (n>90), when electrons recombine with ions in ionized gas regions, like HII regions.

Thomas Telkamp @telkamp.eu · May 25

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

H116⍺ RRL as measured in Dwingeloo.

Thomas Telkamp @telkamp.eu · May 18

And the carrier still being received by the historic @radiotelescoop.bsky.social last week Wednesday!

Voyager carrier as received in Dwingeloo.

Reposted by Thomas Telkamp

Chris Hadfield @cmdr-hadfield.bsky.social · May 17

Imagine starting a car that hadn't run in 21 years, that's 15 billion miles away in interstellar space. That's what the NASA team just did with Voyager's thrusters. People are amazing. jpl.nasa.gov/news/nasas-v...

Thomas Telkamp @telkamp.eu · May 18

So impressive. And we can still receive the Voyager 1 carrier with the historic 25 meter dish in Dwingeloo @radiotelescoop.bsky.social, as we demonstrated last week Wednesday.

Voyager 1 carrier as received in Dwingeloo.

Reposted by Thomas Telkamp

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

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!

Voyager carrier received at Dwingeloo.

Reposted by Thomas Telkamp

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.

Reposted by Thomas Telkamp

CosmicRami 🏳️‍🌈🏳️‍⚧️ @cosmicrami.com · Apr 2

Just catching up on this excellent #RadioAstronomy work by ProAm group using the Dwingeloo Telescope. 🔭📡

They managed to fire a signal at Venus, and catch the reflection back on two antennas here on Earth!

There is *lots* of nice working coming from this group! 👏👏👏

Blog + link to script below

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

Reposted by Thomas Telkamp

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.

Reposted by Thomas Telkamp

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

Reposted by Thomas Telkamp

Cees Bassa @cbassa.bsky.social · Mar 6

Zooming in on the final minutes of the descent burn, we can see the braking burn transitioning into a hover around 17:28UTC and then a slower descent. At 17:28:45UTC there's a jump in frequency and then a slower leveling off to the Doppler frequency of the Moon. Congratulations on the landing!

Reposted by Thomas Telkamp

Cees Bassa @cbassa.bsky.social · Mar 6

For the second time this week, the @radiotelescoop.bsky.social had a front row seat on a lunar landing attempt. This time by @intuitivemachines.bsky.social #IM-2 lunar lander. We listed to Doppler effect on the S-band signals at 2210.6MHz during its successful descent to the lunar surface.

Thomas Telkamp @telkamp.eu · Mar 5

Yesterday bouncing Zadoff-Chu sequences off the moon!

Delay-Doppler plot of Zadoff-Church sequence bounced off the moon.

Reposted by Thomas Telkamp

Cees Bassa @cbassa.bsky.social · Mar 2

With the #BGM-1 lander from @firefly-aerospace.bsky.social now safely on the surface of the Moon, we've had some time to take a closer look at the @radiotelescoop.bsky.social's observation of the #BGM-1 signal during the landing, which shows several events during the landing sequence.