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New LoRa RF distance record

thethingsnetwork.org

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Re: New LoRa RF distance record

#51

Post by dbrgn »

Svenstaro wrote: post #42
wienke wrote: post #37

Earlier quoted context omitted.

How would that exactly work?

I did this once as a small experiment. Basically use a small TCP stack with LoRa as layer 1 and then expose the whole thing as a Linux kernel module. It was a bit shitty but it seemed promising. For some reason, I don't find LoRaWan at all alluring. As far as I can tell, in the end it's in the hands of one company and that really defeats the spirit for me. I mostly just use LoRa for point-to-point connections with my…

At least on 868 MHz, if you stick to the 1% duty cycle limitations that the ISM band allows, I doubt that you'll be happy with the web surfing performance.

(For those that don't know duty cycle limitations: https://www.thethingsnetwork.org/docs/lorawan/duty-cycle/)

Re: New LoRa RF distance record

#52

Post by rcarmo »

martin_a wrote: post #19
wienke wrote: post #12

Earlier quoted context omitted.

For sure would be great but LoRa has limitations as it is designed for small sensors that sent very little data: https://www.thethingsnetwork.org/docs/lorawan/limitations/

Ah, I see. Seems like directional antennas for WiFi would be what I need then.

Yes. 2.4GHz ones will do fine (and better than 5GHz for that range).

Re: New LoRa RF distance record

#53

Post by jacquesm »

wienke wrote: post #45
jacquesm wrote: post #39

Earlier quoted context omitted.

That's not what the karma mention was about, it basically means that you are not likely to be known here, that's all. But fair enough, thanks for the profile update.

So people that are not known here have nothing interesting to share? Recipe for an echo chamber.

That's not what I meant and I suspect you are well aware of that.

Re: New LoRa RF distance record

#54

Post by H8crilA »

dbrgn wrote: post #50
nickcw wrote: post #43

LoRa runs in the 868 MHz band (in Europe) - a frequency range known for being line of sight only as the ionosphere doesn't reflect radio waves of that high frequency. However sometimes you can get Troposheric propagation on these high frequency bands. This used to be common when I was a teenager living in the south of England in Kent and we could occasionally receive racy TV channels from Europe. https://en.wikipedia…

Could the signal bounce off airplanes as well, or is that effect not relevant in practice? (I think I've heard such stories before from radio amateurs...)

It can bounce off of meteor trails or the moon. It's been done many times in the ham community. Signals do bounce off of aircraft too, there are even passive military radars that track airborne objects using DVB-T or other strong signal reflections. It could be used if the conditions are just right.

All of this has really nothing to do with LoRa and everything to do with physical properties of the emissions (frequency, power, polarization) and physical properties of whatever happens to exist in the world at the time.

Re: New LoRa RF distance record

#55

Post by circuit10 »

wienke wrote: post #45
jacquesm wrote: post #39

Earlier quoted context omitted.

That's not what the karma mention was about, it basically means that you are not likely to be known here, that's all. But fair enough, thanks for the profile update.

So people that are not known here have nothing interesting to share? Recipe for an echo chamber.

I guess what they’re trying to say is that if you were well known you might not need to disclose it because people would already know?

Re: New LoRa RF distance record

#56

Post by pmuk »

jacquesm wrote: post #21
johanstokking wrote: post #15

CTO & co-founder of The Things Network here! I've been working with LoRa for over eight years now, and I keep getting surprised by measurements like this. What started off as "line of sight works" went to a successful "LoRa moon bounce" [0] and now a sea level reception over 830 miles. So, any physics people here care to comment how this works? Is this pure atmospheric refraction or is there something else? [0] https…

[flagged]

I read astroturfing as astrosurfing and thought this was the name for bouncing the signal off the moon.

Re: New LoRa RF distance record

#57

Post by jacquesm »

throwbadubadu wrote: post #47
jacquesm wrote: post #39

Earlier quoted context omitted.

That's not what the karma mention was about, it basically means that you are not likely to be known here, that's all. But fair enough, thanks for the profile update.

I think I don't know 99% of the CEOs posting here, and I also don't need to? In the end similarly as any other employee posting for his company, and disclosure in the post is just fine? Don't get it.

HN is weird in that there is a format for that, which, as a relatively new entrant you may not be aware of, but that's what 'Show HN' is for, so that you know that whoever is posting something is associated with the article. Otherwise you will get to the point where HN is just another advertising medium, only with the ads not labelled as ads.

Re: New LoRa RF distance record

#58

Post by jacquesm »

pmuk wrote: post #56
jacquesm wrote: post #21

Earlier quoted context omitted.

[flagged]

I read astroturfing as astrosurfing and thought this was the name for bouncing the signal off the moon.

Now that's neat, you get to claim to have invented a new word!

But the original name for that is EME for Earth-Moon-Earth. Radio amateurs have been doing this for decades, it's a fun thing to try.

Re: New LoRa RF distance record

#59

Post by catbert69 »

dbrgn wrote: post #50
nickcw wrote: post #43

LoRa runs in the 868 MHz band (in Europe) - a frequency range known for being line of sight only as the ionosphere doesn't reflect radio waves of that high frequency. However sometimes you can get Troposheric propagation on these high frequency bands. This used to be common when I was a teenager living in the south of England in Kent and we could occasionally receive racy TV channels from Europe. https://en.wikipedia…

Could the signal bounce off airplanes as well, or is that effect not relevant in practice? (I think I've heard such stories before from radio amateurs...)

For doing meteor- and airplane-scatter stuff you need quite a bit of transmission power. The max. tx power of LoRa transmitters is way too low.

Re: New LoRa RF distance record

#60

Post by pgeorgi »

SahAssar wrote: post #23
jacquesm wrote: post #21

Earlier quoted context omitted.

[flagged]

Posting ones own content is not astroturfing unless they try to hide that it was them.

It's the combination of company URL, posted by a company person, commented on by another company person pushing questions (i.e. generate engagement) that seemed weird, and feels orchestrated.

It's well possible that this was really an innocent accident, but it would have looked better if something like this engagement post was posted by the same account as the original link.

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