this post was submitted on 01 Nov 2024
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Science Memes

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[–] Zess@lemmy.world 125 points 1 week ago (4 children)

Nothing since a radio telescope isn't a fucking speaker.

[–] dsilverz@thelemmy.club 25 points 1 week ago (1 children)

I once saw a video of a person touching a grounded sausage to the metallic structure of an AM radio tower, the transmission was audible as the sausage was being zapped. If there's a merely conductible thing grounded near the tower, I guess it'll sort of "coil whine" (a well-known phenomenon when electrical components physically vibrate due to the passage of current), converting to sound whatever it's being transmitted at the moment. This includes the tower structure itself, if the electrical grounding isn't properly done or if there's some grounding leak. Otherwise, a grounded thing touching the tower would suffice to convert the transmission into sound, if those radio-telescopes use AM modulation (I'd guess they do, because AM modulation is known for reaching longer distances than FM).

[–] Hagdos@lemmy.world 12 points 1 week ago (8 children)

AM doesn't reach further than FM, it's just that historically we've been using AM at lower frequencies, and these travel further. You could transmit with FM just as well on these frequencies, and get the same range.

These radio telescopes don't transmit anything at all, they listen to radio waves coming from the cosmos. Much like a normal telescope doesn't transmit light.

[–] dsilverz@thelemmy.club 8 points 1 week ago* (last edited 1 week ago)

historically we’ve been using AM at lower frequencies, and these travel further

While I agree with that statement...

AM doesn’t reach further than FM

... i disagree here. Yes it kinda does, and there's why: FM deteriorates with phase shifting introduced by phenomena such as ionospheric reflection, while AM is more resilient to it because it encodes information as amplitude variations instead of frequency (and therefore, implicit phases) variations. Also, FM needs more bandwidth than AM. Also, the overlay of two or more simultaneous AM transmissions is "more understandable" than two or more simultaneous FM transmissions laying on the same frequency. Both the three are the reasons why the modern aviation continues to use AM for comm between TWR and airplanes, as an example. Not just by historical reasons, it's because AM is more resilient than FM.

By "reaching further", I don't mean the range of propagation because, as you correctly said, it has more to do about wavelength and, therefore, the carrier frequency. By "reaching further", I actually mean the capability for the signal to be correctly demodulated and minimally understandable at the end. If a signal can propagate across hundreds of thousands of kilometers (for example, between Earth and the Moon), but it can't be recognizable at the other point (because the phases are all messed up to the point of being unable to be demodulated), then the signal (as in the content to be transmitted/received) couldn't really "reach further".

Here goes an example: I live in Brazil, in the southeast. I was in Sao Paulo state (not the city) when I once managed to receive an English-spoken CB (Citizen Band, 11 meters, approx. 27MHz) transmission. Most of our neighboring countries are Spanish-speakers, the only nearest English-speaking country is Guyana (the nearest corner close to Jatapu River being 3,000 km from Sao Paulo in straight line), but I could tell by the operator accent that he was not from Guyana. The reception would be almost crystal-clear, if my receiving setup were better (I was using a RTL-SDR with a piece of long wire barely touching the outside of the antenna's jack). While there are repeaters for CB, they're not as common as VHF or UHF repeaters, where you can even find, for example, EchoLink repeaters, so the international transmission really made into my Brazilian home, and it was even daylight! I only could tell the signal because it was AM modulated.

When we talk about deep space communication, sure some things change, but most of the same rules apply.

These radio telescopes don’t transmit anything at all,

Back in 1974, the former Arecibo radiotelescope was used to transmit the famous Arecibo message (some sources Wikipedia and Universe Today). So, while they're most used for reception, they can be (and they were) used for transmitting as well. It's not a straightforward thing, it's not simply a switch to be toggled receive-or-transmit because they involve different electronic circuitry, but the structure, the dishes and the antenna, can both transmit and receive: for reception, it just interacts with electromagnetic fields, which induces an oscillating electrical current all the way through the structure until it's filtered (through electronic components such as variable capacitors) and amplified by a receiver circuit, while as for transmission, it conducts an oscillating electrical current and irradiates it, depending on the antenna shape and properties.

Much like a normal telescope doesn’t transmit light.

It's also a possible thing: https://en.wikipedia.org/wiki/Lunar_Laser_Ranging_experiments#List_of_retroreflectors

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[–] NostraDavid@programming.dev 10 points 1 week ago

Aw boo! Where is your sense of fantasy!?

[–] refalo@programming.dev 9 points 1 week ago

you must be fun at parties

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[–] breadsmasher@lemmy.world 99 points 1 week ago (2 children)
[–] n3m37h@sh.itjust.works 15 points 1 week ago (4 children)

Pathetic, everyone knows that the BF3 intro will shake any rust off any car near by.

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[–] trxxruraxvr@lemmy.world 57 points 1 week ago (1 children)
[–] spicytuna62@lemmy.world 11 points 1 week ago (4 children)
[–] RQG@lemmy.world 32 points 1 week ago

Dududududu Dududududu dududu

[–] snowadv@lemm.ee 26 points 1 week ago (1 children)

At first it goes like synth and then it is dudududu dudududu dudududu dudududu dudududu dududuuddududuuud shiuush dududududududuuuuddudddududududddududdudududduududududu

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[–] pyre@lemmy.world 7 points 1 week ago

Darude - Sandstorm

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[–] neidu2@feddit.nl 43 points 1 week ago* (last edited 1 week ago) (5 children)

The 1989 Belgian techno anthem Pump Up the Jam.

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[–] thebardingreen@lemmy.starlightkel.xyz 30 points 1 week ago (2 children)
[–] snausagesinablanket@lemmy.world 14 points 1 week ago (1 children)

That was awesome! I never heard this band before!

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[–] mojofrododojo@lemmy.world 23 points 1 week ago

Darude, Sandstorm

[–] cosmicrookie@lemmy.world 21 points 1 week ago (2 children)
[–] KazuchijouNo@lemy.lol 7 points 1 week ago
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[–] muculent@lemmy.world 21 points 1 week ago

Pump Up The Jam by Technotronic

[–] dsilverz@thelemmy.club 17 points 1 week ago

Let S be an endless string which is a concatenation of every binary counting in succession, starting from zero all the way to infinity (without left zero-padding):

S = 01101110010111011110001001101010111100110111101111...
(from concatenating 0, 1, 10, 11, 100, 101, 110, 111, 1000, 1001, and so far)

Let S' be a set of every sequential group of octets (8 bits) from string S, which can be represented as a base-10 number (between 0 and 255), like so:

S'_2 = [01101110, 01011101, 11100010, 01101010, 11110011, 01111011, ...]
S'_10 = [110, 93, 226, 106, 243, 123, ...]

I'd create an audio wave file whose samples are each octet from S'_10 as 8-bit audio samples, using a really low sampling rate (such as 8000 Hz or even 4000 Hz).
That sound, that particular sound, is what I'd transmit to the cosmos: the binary counting, something with a detectable pattern (although it'd be not so easily recognizable, but something that one could readily distinguish from randomness noise).

[–] smiletolerantly@awful.systems 17 points 1 week ago (4 children)

"Come here! I will help you conquer this world. Our civilization is no longer capable of solving its own problems. We need your force to intervene."

(Not really, but...)

[–] thr0w4w4y2@sh.itjust.works 7 points 1 week ago* (last edited 1 week ago)

Calm down there, Ye Wenjie…

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[–] Aggravationstation@feddit.uk 16 points 1 week ago* (last edited 1 week ago) (4 children)

Prodigy - Diesel Power

Or maybe the brown note. If it was ever going to work it'd be through this.

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[–] BuboScandiacus@mander.xyz 16 points 1 week ago

Either Never Gonna Give You Up or Darude - Sandstorm

-The internet (10-15 years ago)

[–] Evil_Shrubbery@lemm.ee 15 points 1 week ago (1 children)
[–] capital@lemmy.world 6 points 1 week ago (3 children)
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[–] SouthFresh@lemmy.ml 14 points 1 week ago (1 children)
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[–] eggymachus@sh.itjust.works 14 points 1 week ago (1 children)
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[–] jabathekek@sopuli.xyz 12 points 1 week ago (2 children)
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[–] Asweet@lemmy.ca 12 points 1 week ago

CBAT. Get the rest of the galaxy in the mood.

[–] ultrahamster64@lemmy.world 12 points 1 week ago

Never gonna give you up

[–] uservoid1@lemmy.world 11 points 1 week ago

Video killed the radio star

[–] Taleya@aussie.zone 11 points 1 week ago

Imperial march

[–] seeyouatthepartyrichter@lemmy.world 9 points 1 week ago (1 children)
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[–] Hobbes_Dent@lemmy.world 9 points 1 week ago

Answer in title, unrelated Belgian techno anthem.

[–] FourThirteen@lemmy.world 8 points 1 week ago

Cotton eye joe

[–] TriflingToad@lemmy.world 8 points 1 week ago

free bird solo 🤙

[–] watersnipje@lemmy.blahaj.zone 8 points 1 week ago (1 children)

Bullug Gegbug Ibgabiug Gixcure Dagabciea Fuic by Keygen Church because the universe deserves to hear the gospel. Praise the code. https://m.youtube.com/watch?v=iJtVDEx2HSk

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[–] 3PO40K@lemmy.world 8 points 1 week ago

Video Killed the Radio (Telescope) Star.

[–] dharmacurious@slrpnk.net 7 points 1 week ago
[–] rustyfish@lemmy.world 7 points 1 week ago

Ready to die by Andrew W.K. The song ending with “You just heard earth music. This was a warning.”

[–] Erasmus@lemmy.world 7 points 1 week ago (1 children)
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[–] griD@feddit.org 7 points 1 week ago (1 children)

Supernaut

A cover of Black Sabbath's "Supernaut", by Al Jourgensen of Ministry's side-project 1000 Homo DJs with vocals by Nine Inch Nails vocalist Trent Reznor.

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[–] drunkpostdisaster@lemmy.world 6 points 1 week ago (1 children)
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[–] Juice@midwest.social 6 points 1 week ago (3 children)

So What'cha Want by the Beastie Boys

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