Digital Telecommunication in HF band - WWWAN - World-Wide Wireless Area Network
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Re: Digital Telecommunication in HF band - WWWAN - World-Wide Wireless Area Network
#2Related but not quite the same: http://www.dxcluster.org/
Dxcluster used to use a lot of radio links to disseminate data. However fixed internet lines have become much cheaper, so there isn't the need to have massive HF antenna to create relay link any more.
Re: Digital Telecommunication in HF band - WWWAN - World-Wide Wireless Area Network
#3"Multimedia"? Over HF where one "cell" (using the WWAN nomenclature) may have several tens kbps of total (uplink and/or downlink) throughput at most? (see Shannon-Hartley theorem, which is distinct from Shannon-Nyquist sampling theorem) But for emails and the rest of proposed use, sure.
Also, OsmoDevCon is iirc invite-only, making linking to its schedule on a public forum mostly pointless (visit #osmocom on Libera for more info; disclaimer: I wasn't invited, either). Unless, of course, a recording would be added (which it probably will), but it's not true yet (as the event didn't took place yet?)
Re: Digital Telecommunication in HF band - WWWAN - World-Wide Wireless Area Network
#4What HF means in this context? A few GHz? Also, for long range I thought the longer the wave length is, the better.
Re: Digital Telecommunication in HF band - WWWAN - World-Wide Wireless Area Network
#5What HF means in this context? A few GHz? Also, for long range I thought the longer the wave length is, the better.
Re: Digital Telecommunication in HF band - WWWAN - World-Wide Wireless Area Network
#6What HF means in this context? A few GHz? Also, for long range I thought the longer the wave length is, the better.
HF is 3 MHz to 30 MHz. Yes it does not make much sense, the term is ancient.
Re: Digital Telecommunication in HF band - WWWAN - World-Wide Wireless Area Network
#7Related but not quite the same: http://www.dxcluster.org/ Dxcluster used to use a lot of radio links to disseminate data. However fixed internet lines have become much cheaper, so there isn't the need to have massive HF antenna to create relay link any more.
> so there isn't the need to have massive HF antenna to create relay link any more.
HF is having quite a resurgance among various militaries.
Re: Digital Telecommunication in HF band - WWWAN - World-Wide Wireless Area Network
#8What HF means in this context? A few GHz? Also, for long range I thought the longer the wave length is, the better.
HF is 3 MHz to 30 MHz. Yes it does not make much sense, the term is ancient.
I mean, any higher and I’ll have to start thinking about printed circuit boards, shielded wires, and non-coat-hanger-based antennas…frankly if 30,000 kilocycles can’t get the job done, I’ll just have to light the thing on fire and use it to make smoke signals.
Best regards, 50 years ago
Re: Digital Telecommunication in HF band - WWWAN - World-Wide Wireless Area Network
#9Earlier quoted context omitted.
HF is 3 MHz to 30 MHz. Yes it does not make much sense, the term is ancient.
I mean, any higher and I’ll have to start thinking about printed circuit boards, shielded wires, and non-coat-hanger-based antennas…frankly if 30,000 kilocycles can’t get the job done, I’ll just have to light the thing on fire and use it to make smoke signals. Best regards, 50 years ago
640 K[Hz] ought to be enough for anybody.