Some things I saved while reading thru Chapter 3: Radio Wave Principles
- Wavelength - Wikipedia
- Formula in book is
λ = 300 / freq_in_MHzwhich seemed uncomfortably round. - Normal formula is
λ = c / freq - c = 299,792,458 m/s ≈ 300 x 1,000,000 m/s
- MHz = 1,000,000 Hz
- ... yeah alright. fine.
- Formula in book is
- Radio propagation - Wikipedia
- Amateur TV? OK time to LOCK IN.
- Phase modulation - Wikipedia
- List of amateur radio modes - Wikipedia
- IEEE 802.11 - Wikipedia
- FT8 - Wikipedia
- Compatible sideband transmission - Wikipedia Huh. interesting technique.
- Packet radio - Wikipedia
- Book claims it was hot shit in 1980s and 1990s. Wiki suggests there was a lot of development around then.
- Cellular digital packet data - Wikipedia
- BELL LABS STRIKES AGAIN Advanced Mobile Phone System - Wikipedia
- AMPRNet - Wikipedia
- Bro they got an entire
/8. Someone brought this up at the radio meetup. - Yeah this seems to be the same one.
In mid-2019, part of IPv4 range was sold off for conventional use As of 18 July 2019, the lower 75% of the 44/8 block (~12 million addresses) remained for amateur radio usage, with the upper 25% (44.192/10, ~4 million IP address) having been sold.Owing to IPv4 address exhaustion, by 2016 the 44/8 block was worth over $100 million.- Sold to AWS, apparently.
the sale raised over $50 million.with no plans to sell any more address space. Paul Vixie stated after the sale of IP address space that "ampr.org can make better use of money than IP space in fulfilling its nonprofit mission, at this stage of the game.- Looks like they're using it for grants.
In January 2022, the [Internet Archive](https://en.wikipedia.org/wiki/Internet_Archive "Internet Archive") received a grant of $0.9 million for assembling a Digital Library of Amateur Radio and Communications (DLARC).In January 2023 the library held over 51,000 items including more than 3,300 books and magazines available via controlled digital lending.
- ARDC | Empowering the future of amateur radio and digital communications
- 44Net Portal
- 44Net Wiki
- Bro they got an entire
- GPRS - Wikipedia Why does this sound familiar?
- GSM - Wikipedia No... But I seem to recall it being some kind of family-licensed radio?
- Family Radio Service - Wikipedia
All 22 channels are shared with GMRS radios.- General Mobile Radio Service - Wikipedia
- Oh that's why. But they're not the same.
- They do seem to operate on bands nearby LoRa 900MHz and Wifi 2.4GHz tho
- Packet Radio Van - Wikipedia LMFAO
- Wait what... "used in the first two-way internetworked transmission on August 27, 1976, and the first three-way internetworked transmission on November 22, 1977, the latter of which is considered the start of the Internet."
- RIP "The van was parked unused for a decade in a back lot of the SRI campus until the planning of a celebration of the 20th anniversary of the Internet in 1997 at the Internet Supercomputer Conference in San Jose, California. SRI employees Don Alves and Don Nielson cleaned, licensed, and replenished the van's radio and Internet equipment. The van was exhibited on the convention floor and was popular with attendees. SRI donated the van to the Computer History Museum to prevent further deterioration."
- Packet switching - Wikipedia
- Book claims it was hot shit in 1980s and 1990s. Wiki suggests there was a lot of development around then.
- Automatic Packet Reporting System - Wikipedia
- Feels kinda like what Meshtastic does?
- "real-time tactical digital communications" hrm I think these radio nerds are using "tactical" in some specific way.
I've seen it before, also used before without the usual "tactical" bro connotations. The wiki page doesn't mention "tactical" at all tho. - Edit: Oh weird. The official ham test also uses that phrase. Probably why it's included in the training book.
- PSK31 - Wikipedia
- 100Hz bands. Wild.
- 31.25 baud? The hell is a baud, anyway.
- Baud - Wikipedia
- huh "symbols per second or pulses per second"
- "Baud is related to gross bit rate, which can be expressed in bits per second (bit/s)"
- Eyy it's bit/s again. I first saw it in the reticulum docs. Where it seemed insane.
- PACTOR - Wikipedia
- Digital mobile radio - Wikipedia
- Color Codes? Sounds like the GMRS / FRS systems?
- Also there's encryption added by manufacturers? I thought that wasn't allowed?
- "System Fusion and C4FM" weird that this got a mention, I could only find this on wikipedia:
- Yaesu (brand) - Wikipedia
- It cross-links to "C4FM" which redirects to the "List of Amateur Radio Modes" but actually has no mention there.
- Frequency-shift keying - Wikipedia
- I guess it was a lead-up to D-STAR - Wikipedia
- "enter [destination call sign] ... the system will route your signal thru linked repeaters to find them"
Sounds a lot like what Reticulum does?
- "enter [destination call sign] ... the system will route your signal thru linked repeaters to find them"
- WSJT (amateur radio software) - Wikipedia
- Yes! HAHAHAHA YES!
- FSTV = Amateur television - Wikipedia ?
- FSTV is apparently an adaptation of NTSC - Wikipedia
- Slow-scan television - Wikipedia
- Adaptation of Narrow-bandwidth television - Wikipedia ?
- MESH NETWORKS MENTIONED
- Automatic repeat request - Wikipedia
Bonus:
- Simplex, using a single frequency for transmit and receive instead of an amateur radio repeater
(via Simplex (disambiguation) - Wikipedia) - SWR Standing wave ratio - Wikipedia
- I should look into this more. Feels like the a pre-meshnet meshnet project. 44Net Wiki