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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 1 day 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
[-] zaphod@sopuli.xyz 3 points 2 days ago

Show me a non-directional antenna.

[-] Lv_InSaNe_vL@lemmy.world 2 points 1 day ago
[-] feddylemmy@lemmy.world 3 points 1 day ago* (last edited 18 hours 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.

[-] ChairmanMeow@programming.dev 0 points 1 day ago
[-] zaphod@sopuli.xyz 3 points 1 day ago

Just because you call it non-directional doesn't mean it is. They all have gain compared to a theoretical isotropic antenna.

[-] wander1236@sh.itjust.works 9 points 3 days ago
[-] WhatAmLemmy@lemmy.world 5 points 3 days ago

It's almost too easy

[-] Trollception@sh.itjust.works 1 points 2 days ago

Perfect. Now put those on cell phones and make it fit in your pocket.

[-] frezik@midwest.social 3 points 1 day ago

Technology always gets better with no regard to physical limits.

(People who argue this unironically are a pet peeve of mine. Yes, there are limitations on what's possible.)

this post was submitted on 13 Mar 2025
322 points (96.5% liked)

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