Comment by shakna
5 months ago
It's not even a byte per second. The latency of the distances involved mean you're looking at around two seconds per round trip, plus a little extra because of the fuzziness of radio in space and absolutely everything that can distort it.
There's a lot of math that goes into selecting the right bit-width for the signal, which I ain't doing here and now [0], but most 24dB things tend to be 32bit for reasons. The arrays here are a bit more, but probably fit that kind of channel.
Assuming 32bit and 30dBi, you'd be sending at roughly 20-30MHz, and receiving at about 1kHz. (Less if you hit bad weather.)
So... 1 bit per second. Not byte. Bit.
This is obviously incorrect. Latency is not the same as bandwidth. EME hobbyists will bounce voice signals off the moon.
No, if you do the math it's about 40 bytes per second (300bps) for Earth-Moon-Earth using their 240-antenna array.
Care to share the math, if you've done it?
It's 1.3 to 1.6 seconds each way to the moon, by radio link.
JPL's much, much, much bigger arrays can only achieve 64kbps.
I dont get it, How does latency affect bandwidth here?
3 replies →
Thank you so much. Are these rough calculations based on the smallest (quad), mini or the large array?
That was for the large array, assuming you were bouncing from you to moon and back again.
Point-to-point on the Earth would actually be semi-decent, as another comment pointed out.
Ok so ... moon is slow going.