alexpil

Not necessarily stonks, it can also be commodities (oil/etc), or currencies, or anything else.

Latency arbitrage is old. Paul Julius Reuter (as in, Reuters) made his first fortune by using carrier pigeons to transmit trade data from Brussels to Aachen. Then he started a new agency and built telegraph lines.

Rice traders in Japan used boats/smoke-signals/runners to transmit information between rice markets in 1700s

https://digital.sandiego.edu/cgi/viewcontent.cgi?article=111... pages 15-22 has more examples.

alexpil

6 lat temudiscuss

pfft. One nucflash=buy, two nucflash=sell

alexpil

6 lat temudiscuss

The decision is whether it meets the threshold "public interest" (which includes meaning of "broadcast"). And it'll be made either by FCC Media Bureau, or by Commission itself. It's highly unlikely it'll get appealed to courts.

alexpil

6 lat temudiscuss

sure, balloons would do it.

i've prototyped that. :)

alexpil

6 lat temudiscuss

I'm the guy who filed it. AMA.

alexpil

6 lat temudiscuss

AM radio (medium-wave/long-wave) is different from shortwave.

In US, similar "utility response" is permitted as well for AM broadcasters, since 1981 https://docs.fcc.gov/public/attachments/FCC-81-258A1.pdf

Subsequently, permission was granted to all AM and FM broadcasters for "subsidiary communications" of any kind, https://docs.fcc.gov/public/attachments/FCC-84-113A1.pdf

But that's not "shortwave"/International HF broadcast

alexpil

6 lat temudiscuss

https://visionscarto.net/enquete-reseaux-hft and google translate for the backstory.

bandwidth is a few bits per message, a few messages per second.

yes you can do more with more bits and more messages, but you can do quite a lot with 2 bits!

alexpil

6 lat temudiscuss

more specifically, gen1 constellation was 1600 satellites per inclination at 1150km, gen2 is 7100 per inclination at 350km.

alexpil

6 lat temudiscuss

That paper is based on gen1 constellation, and predates gen2 (350km) announcement.

alexpil

6 lat temudiscuss

a single orbital plane at 53' contains 7028 satellites (out of 40k total, but let's take one orbital plane)

basic math, "satellite density" or "average distance between satellites" if they were just at random position is ~200km (napkin math, might be off).

alexpil

6 lat temudiscuss

gen2 constellation is at 350km agl shortwave f-layer is at 200-400km agl depending on space weather

difference is not that big

alexpil

6 lat temudiscuss

it'd be rather interestink.

but shortwave will be competitive with spacex, although at, of course, lower capacities.

for inter-market trading, sub-ms latency differences don't matter that much.

alexpil

6 lat temudiscuss

starlink latency could be faster than shortwave, once full gen2 constellation launches, and if starlink decides to care about this industry.

...disclosure: i'm the first one to build NY-Chi microwave, and Chi-Lon shortwave.

alexpil

8 lat temudiscuss

I'm still around and in the industry.

Never promised the lowest latency, but I was the first one by two years to build NY<>Chicago.

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Shortwave trading HFT shenanigans continue

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