121 lines
6.5 KiB
Markdown
121 lines
6.5 KiB
Markdown
# Introduction to the Pine Tree Radio Society
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## Outline
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Newbie talk <15min, <5min?
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* Who we are
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* History
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* Pine Tree Riots
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* Weare, New Hampshire, April 14th, 1772, was one of the earliest colonial rebellions
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* Predates the Celtic Metric-Leaf Shindig on December 16th, 1773, by 1 year, 8 months, and 2 days
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* Club impetus
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* Shutting down of Parler in 2021
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* January 8th, Google pulled Parler from Google Play Store
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* January 8th, Apple requested Parler submit a "moderation improvement plan" within 24 hours
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* January 9th, Apple removed Parler from the App Store
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* Twillio shutdown Parler's two-factor authentication service
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* Okta denied access to idenity management services breaking some of Parler's software tools
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* ScylliaDB ended Parler's use of Scyllia Enterprise Database
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* January 9th, Amazon said it would shutdown services the next day
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* If seemingly distributed, seemingly coordinated, attacks could take down a seemingly free-speech bastion, what other unseemly platforms could be taken down? How would we communicate vital information not-yet-approved or agreed-upon?
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* Founders Jack and Will held some group discussions with citizens and amateur radio operators (hams)
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* the hams were too much, overwhelming the non-hams with technical and legal details
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* We needed a group focused on "soccer moms" staying informed, not learning antenna theory to design antennas for radio contests
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* Club goals
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* community communication
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* un-censor-able speech
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* share information in time of need
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* approachable
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* distributed, decentralized, alternatives
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* Current
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* crew
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* Jack de facto leader of cats
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* Will co-founder
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* meeting schedule
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* second Saturday of the month at The Quill
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* online presence
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* <ptrs.club>
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* Telegram Announcements <https://t.me/pinetreeradiosociety>
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* Telegram Chat <https://t.me/+i7Kr0tS4FhEzMzdh>
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* ~~Matrix~~ (Server down)
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* Signal PTRS Manchester, loosely affiliated
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* local vendor table(s)
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* Meshtastic, radios, 3D printing, etc.
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* Radio Theory
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* RF - Radio Frequency. Electromagnetic spectrum vibrations. Starting at:
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| Band | Band | Frequency Range | Wavelength | Uses |
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| --------------- | --------------- | --------------- | --------------- | --------------- |
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| Extremely Low | ELF | 3 Hz - 30 Hz | 100,000km - 10,000km | |
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| Super Low | SLF | 30 Hz - 300 Hz | 10,000km - 1,000km | |
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| Ultra Low | ULF | 300 Hz - 3 kHz | 1,000km - 100km | |
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| Very Low | VLF | 3 kHz - 30 kHz | 100km - 10km | |
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| Low | LF | 30 kHz - 300 kHz | 10km - 1km | |
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| Medium | MF | 300 kHz - 3 MHz | 1km - 100m | AM |
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| High | HF | 3 - 30 MHz | 10m - 1m | Shortwave, Ionospheric propagation |
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| Very High | VHF | 30 - 300 MHz | 1,000cm - 100cm | FM, TV, MURS, Air Band, "Low Band" for fire and police |
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| Ultra High | UHF | 300 - 3,000 MHz | 1m - 10cm | |
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| Ultra High | UHF | 300 - 1,000 MHz | 100cm - 30cm | TV, FRS/GMRS, MURS, Police, Fire, CDMA, Cellular |
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| Ultra High | L band | 1 - 2 GHz | 30cm - 15cm | GPS, GSM |
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| Ultra High | S band | 2 - 4 GHz | 30cm - 15cm | Bluetooth, 2.4GHz WiFi, Microwave |
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| Ultra High | C band | 4 - 8 GHz | 7.5cm - 3.8cm | Satellite, 4.9 GHz Public Safety |
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| Ultra High | X band | 8 - 12 GHz | 3.8cm - 2.5cm | Satellite |
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| Ultra High | K (sub u) band | 12 - 18 GHz | 2.5cm - 1.7cm | Satellite |
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| Super High | SHF | 3 - 30 GHz | 10cm - 10mm | |
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| Super High | K band | 18 - 27 GHz | 1.7 - 1.1cm | Satellite |
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| Super High - Extremely High | K (sub a) band | 27 - 40 GHz | 1.1 - 0.75cm | Satellite |
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| Extremely High | EHF | 30 - 300 GHz | 10mm - 1mm | |
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| Extremely High | V band | 40 - 75 GHz | 0.75 - 0.40cm | Satellite |
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| Extremely High | W band | 75 - 100 GHz | 0.40 - 0.27cm | Satellite |
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| Extremely High | mm | 110 - 300 GHz | 0.27 - 0.10cm | |
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| Tremendously High | THF | 300 GHz - 3,000 GHz| 1mm - 0.1mm | |
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* v = lambda x f => c=wf => w = speed of light / frequency
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* 468 ft / freq in MHz = overall half-wave length (vf (velocity factor) of wire already considered)
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* Propagation: ground wave and sky wave
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* Most radio waves travel along LOS (Line-of-Sight) (plus ~15%)
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* Up on a mountain, tremendous range.
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* Repeaters on mountains and towers allow handhelds and mobiles to reach beyond LOS.
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* 2-10 MHz can refract off the ionosphere and bounce back down (and up and back down).
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* Skip zone is dead area between end of ground wave and Sky Wave returning to Earth.
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* Similar roots as CB "Skip"
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* NVIS - Near Vertical Incident Sky Wave
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* PACE Plan (Primary Alternate Contingency Emergency)
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* PACE should not share devices, frequencies, antennas, nor dependencies
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* E.g. Cellphone for call and email means you lose both when your battery dies.
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* P - Cell, A - Email, C - Radio, E - walk over and tap on shoulder
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* Modulation is how information is imparted to the Carrier wave
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* CW - Continuous Wave (Morse Code)
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* AM - Amplitude Modulation (Air band, Shortwave)
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* SSB - Single side band (Shortwave)
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* USB, LSB - Upper Side Band (above 10MHz and digital), Lower Side Band (below 10MHz)
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* convention from repurposing WWII surplus gear
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* FM - Frequency Modulation (Baofengs)
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* AFK - Audio Frequency Shift Keying (tones, RTTY (Radio Teletype))
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* MFSK - Multiple Frequency Shift Keying (many tones)
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* OFDM - Orthogonal Frequency Division Multiplexing (Vara)
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* Checksums - error detection
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* FEC - Forward Error Correction (error detection and possible fixing)
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* Projects
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* Everyone gets a radio!
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* Kit (hand-held local two-way, receive AM/FM/Shortwave)
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* training with multiple levels
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* 3-3-3 Radio Project
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* Emergency/Ad Hoc communications Plan
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* Any radio, tune to Channel 3 (CB, FRS, GMRS, MURS (green dot))
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* Every third hour 3, 6, 9, 12
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* Call out and listen for three minutes
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* PTRS runs a monthly test, all day on the 3rd
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* Meshtastic
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* Reticulum
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* VoIP apps and devices
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* MeshCore
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* GMRS
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* repeaters
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* Previous
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* HF NVIS (High Frequency Near Vertical Incident Skywave) statewide comms via ham radio frequencies
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* Programming Baofengs in June 2026
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* Range testing from The Barn (Wearehouse) 2023-2024
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* Programmed Baofengs to Porkfest in 2023
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* Low-power FM transmitter for Porkfest
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