Viewing profile — colanderman

Anything physical which dampens higher frequency oscillations would act as an antialiasing filter.

Spectral power density is the primary concern. The legal power limit in these bands is 1 W. If you spread that out over 500 kHz, that signal is weaker than background noise at any …

Correct. The LoRa configurations mentioned which offer 100× the speed of Meshtastic/Core operate at 800 kHz and 1.6 MHz bandwidth, which are permitted by the FCC in 15.247. As far …

The 915 MHz, 2.4 GHz and 5.8 GHz bands are regulated in the US largely in the same manner, see https://www.ecfr.gov/current/title-47/chapter-I/subchapter-A...

I did not state that humans cannot see corona. Nor is the paper is about humans seeing corona. It is about detecting UV photons using specialized equipment.

Which photograph? The one in the article is not from the paper. The paper contains no photographs of corona.

Can you point me to the images of corona in the paper which I missed?

The images in the article are not from the paper. The paper contains no images of corona.

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There is in fact no photograph of treetops glowing. There is a digital UV-wavelength video of the corona, and a visible-wavelength video of the trees. The paper [1] contains a sole…

Nice! I've been looking for such a thing lately. KISSLoraTNC [1] is another implementation: The radio control interfaces differ though. [1] https://github.com/kc1awv/KISSLoRaTNC

I am just getting into the packet scene in the Boston area. APRS aside, as far as I've found, there are about a half dozen Winlink nodes in the area and one BBS. And one lovely nod…

Hah! I was literally about to open up my nascent userland AX.25 stack. Is yours open-source, or would you mind sharing? (My e-mail is in my profile.) I want to get something runnin…

You may find a good fit at a UU church.

I have nostalgia for Wario Land, because I played it for 5 minutes in a Toys'R'Us, and it's a good game which I never got to play in full until decades later. But I never owned one…

I know only basics about mesh networks per se . I'm speaking here from a background in signal theory / amateur radio / research on the LoRa protocol. If you have specific questions…

Correction (too late to edit), MeshCore is 62.5 kHz bandwidth, not 125 kHz.

I am pretty sure (though have not vetted) that triangulation of LoRa is possible even at very low SNR. The trick is understanding LoRa's trick, which is simply to "skew" the signal…

A gentle FYI for casuals interested in Meshtastic / MeshCore in the the USA: the default radio settings promoted by both these services are actually outside the parameters permitte…

No, but all MeshCore radios operating in Companion Radio mode do, which is what my post is about.

Agreed – and MeshCore follows a similar "security on the radio" design. With the "cell phone + companion radio" setup which is currently very popular, it would seem the correct sol…

Ah TDoA might not have the resolution you need for that, unless you are working with very wideband signals. Probably ~100 m resolution is the best you can get from it.

Oh wow that's a fantastic resource thank you!

https://khanfar-spectrum-analyzer.web.app/ also has some phase-based direction-finding software and upcoming hardware. For triangulation though, if you have a reference signal at a…