5 ms·

I thought this was an April fools joke once I clicked on the link. The bandwidth they are operation on (54 MHz) is ridiculous though! Truly sci-fi-ish stuff goi

I thought this was an April fools joke once I clicked on the link. The bandwidth they are operation on (54 MHz) is ridiculous though! Truly sci-fi-ish stuff going on here. Also, did Amazon build this from scratch or did they acquire a company that had the basic infra for this kind of stuff?

oh_sigh 7y ago
What's so weird about 54mhz? It's very close to the somewhat commonly used 6 meter band by hams
- BenjiWiebe 7y ago
  Bandwidth and frequency are very different. They have a 54MHz wide uplink, at whichever of the supported bands you want.
  - tommica 7y ago
    I'm a person who knows nothing about these things, and my quick googling didn't help me - how "fast" is 54MHz wide uplink? Can it be measured in internet network speeds, or in what kind of way can I compare the speed of it?
    - namibj 7y ago
      It depends on the SNR. You can assume that almost all satellite connections use between 0.2 and 3 bit/s/Hz. It's likely closer to 1 bit/s/Hz though.
      - mbreese 7y ago
        So operating with 54MHz of bandwidth would result in a transfer rate of somewhere on the order of 54 Mbps?
        drmpeg 7y ago
        Many cable channels are using DVB-S2 8PSK at 5/6 rate. That would be 110 Mbps in 54 MHz (45 Msyms/s).
ahsima1 7y ago
Not really, that's the bandwidth of an average mid-end SDR like LimeSDR(300$) or BladeRF(500$)
- thoraway1010 7y ago
  I have never heard of a LimeSDR putting out a 54Mhz wide signal for broadcast. Can you describe how you are configuring things?
  - ahsima1 7y ago
    Haven't worked with LimeSDR myself, but here's the paper that suggests that it's possible https://upcommons.upc.edu/bitstream/handle/2117/119623/memoria.pdf https://upcommons.upc.edu/bitstream/handle/2117/119623/memor...
thoraway1010 7y ago
I was curious bout this as well. Do people get 500 Mhz allocations? Or are there no allocations because things are directional? I think they support a 500Mhz wide downlink?
kartikkumar 7y ago
Lockheed is building out the ground infrastructure network [1] [1] https://spacenews.com/amazon-lockheed-venture-casts-shadow-on-ground-station-startups/ https://spacenews.com/amazon-lockheed-venture-casts-shadow-o...

oh_sigh 7y ago

What's so weird about 54mhz? It's very close to the somewhat commonly used 6 meter band by hams

BenjiWiebe 7y ago
Bandwidth and frequency are very different. They have a 54MHz wide uplink, at whichever of the supported bands you want.
- tommica 7y ago
  I'm a person who knows nothing about these things, and my quick googling didn't help me - how "fast" is 54MHz wide uplink? Can it be measured in internet network speeds, or in what kind of way can I compare the speed of it?
  - namibj 7y ago
    It depends on the SNR. You can assume that almost all satellite connections use between 0.2 and 3 bit/s/Hz. It's likely closer to 1 bit/s/Hz though.
    - mbreese 7y ago
      So operating with 54MHz of bandwidth would result in a transfer rate of somewhere on the order of 54 Mbps?
      - drmpeg 7y ago
        Many cable channels are using DVB-S2 8PSK at 5/6 rate. That would be 110 Mbps in 54 MHz (45 Msyms/s).

ahsima1 7y ago

Not really, that's the bandwidth of an average mid-end SDR like LimeSDR(300$) or BladeRF(500$)

thoraway1010 7y ago
I have never heard of a LimeSDR putting out a 54Mhz wide signal for broadcast. Can you describe how you are configuring things?
- ahsima1 7y ago
  Haven't worked with LimeSDR myself, but here's the paper that suggests that it's possible https://upcommons.upc.edu/bitstream/handle/2117/119623/memoria.pdf https://upcommons.upc.edu/bitstream/handle/2117/119623/memor...

thoraway1010 7y ago

I was curious bout this as well. Do people get 500 Mhz allocations? Or are there no allocations because things are directional? I think they support a 500Mhz wide downlink?

kartikkumar 7y ago

Lockheed is building out the ground infrastructure network [1] [1] https://spacenews.com/amazon-lockheed-venture-casts-shadow-on-ground-station-startups/ https://spacenews.com/amazon-lockheed-venture-casts-shadow-o...