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that about 1/1000 of your phones RF power output, and the distance is 384400km (sh.itjust.works)

submitted 3 days ago by einfach_orangensaft@sh.itjust.works to c/science_memes@mander.xyz

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[-] zaphod@sopuli.xyz 29 points 3 days ago

It's easy, you just need a big antenna, low noise receiver (just cool it) for low bandwidth (keeps noise power low) and no interferers in the same frequency band.

[-] JayDee@lemmy.sdf.org 1 points 2 days ago

That's fair, though I think we also should thank the use of Travelling Wave Tubes (TWTs or 'twits'). These little tubes of witchcraft amplify the transmission signal to make sure we can still hear, say, the Voyager 1 that's currently over 15-billion miles away.

[-] Zwiebel@feddit.org 9 points 3 days ago

*directional antenna

[-] zaphod@sopuli.xyz 3 points 3 days ago

Show me a non-directional antenna.

[-] Lv_InSaNe_vL@lemmy.world 2 points 2 days ago

Omni-directional antennas?

[-] feddylemmy@lemmy.world 3 points 2 days ago* (last edited 1 day ago)

Omnidirectional antennas attempt to radiate equally horizontally. An isotropic antenna radiates equally in all directions but is only theoretical. All antennas have some gain.

That being said, there are some antennas that attempt to minimize that gain and be as non-directional as possible while other antennas attempt to maximize that gain and become as directional as possible.