34 listings in the directory for “paging”.
Old-web POCSAG notes plus a wider paging index at braddye.com/paging.html. Capcodes, batch math, the stuff the ITU PDF assumes you know.
http://www.braddye.com/pocsag.html
Motorola one-way successor to POCSAG. 1600 / 3200 / 6400 bit/s, 2- or 4-level FSK, 128 frames every four minutes.
https://www.notepage.net/learning-center/what-is-flex-paging.htm
Feb 1998 table: POCSAG 2400 2-FSK async; FLEX 6400; ReFLEX-25 6400/9600 on 25/12.5 kHz; ReFLEX-50; InFLEXion. Best one-page comparison that is not a vendor slide.
https://archive.org/details/Hewlett-Packard_Journal_Vol._49_No._1_1998-02_Hewlett-Packard
Readable walkthrough. 576-bit 1010 preamble, frame sync, eight frames of two 32-bit words, function bits 20–21 pick numeric vs alpha.
https://pic.hallikainen.org/techref/pager/pocsag.html
Decentralized Amateur Paging Network. POCSAG on 439.9875 MHz (70 cm). Licensed hams only. Web + apps send to a capcode / RIC.
https://hampager.de
Voice and data cabling. Install, repair, and move business telephone and paging systems.
http://www.datatel.us
Radio Paging Code No. 1. Official POCSAG recommendation. 512 / 1200 / 2400 bit/s, 32-bit codewords, preamble plus batches.
https://www.itu.int/rec/R-REC-M.584/en
Two-way radios plus on-site paging systems. Sales and service.
http://www.mcsradio.com
Two-way Motorola paging. ReFLEX25 uses 25 kHz forward / 12.5 kHz reverse; ReFLEX50 uses 50 kHz forward. Return rates up to 9600 bit/s.
https://en.wikipedia.org/wiki/ReFLEX
One-way alphanumeric workhorses. POCSAG and later FLEX. The belt clips that outlived the carriers.
https://en.wikipedia.org/wiki/Motorola_Advisor
Jonathan G4KLX gateway from DAPNET into MMDVMHost. Hotspot becomes a POCSAG stick on 439.9875.
https://github.com/g4klx/DAPNETGateway
Network sketch. Pi + UniPager + MMDVM or RasPager, AlphaPOC / Skyper receivers, ~20 km per stick depending on height.
https://en.wikipedia.org/wiki/DAPNET
One-way, two-way, and wireless data. Pagers in the product list on purpose.
http://www.falcondirect.com
Modes 1600/2, 3200/2, 3200/4, 6400/4. Sync + 11 blocks per frame. Battery-save by sleeping between assigned frames. No encryption.
https://handwiki.org/wiki/FLEX_(protocol)
GNU Radio blocks for POCSAG 512/1200/2400 and FLEX. Encoder side. Points at ITU M.584 and ARIB STD-43 for FLEX.
https://github.com/unsynchronized/gr-mixalot
Decoder. POCSAG 512/1200/2400, FLEX, a pile of other digital voice. Pair with an SDR on a frequency you are allowed to listen to.
https://github.com/EliasOenal/multimon-ng
Cellular, Mike phones, pagers, satellite. Vancouver-area wireless counter.
http://www.pcoast.ca
The two-way brick with a tiny keyboard. ReFLEX, 900 MHz in the US. This is the “Motorola two-way” people mean.
https://en.wikipedia.org/wiki/Motorola_PageWriter
Windows POCSAG / FLEX decoder from the discriminator.nl shelf. Old, still the GUI a lot of people open next to HDSDR.
https://www.discriminator.nl/pdw/index-en.html
Pi + 4.5 kHz FSK radio + UniPager. Parts list and the 439.9875 / ±4.5 kHz numbers in one place.
https://www.pe2kmv.nl/wp/en/pocsag-en/dapnet-pocsag-transmitter
RX plus TX for old pagers. POCSAG three speeds and FLEX 1600–6400. Author notes ReFLEX docs are still thin outside patents.
https://github.com/jjwbruijn/POCSAG_FLEX_Modem
Raspberry Pi add-on board that actually FSK-modulates POCSAG. The low-power personal TX on the DAPNET map.
https://github.com/rwth-afu/RasPager
What the signal looks like. 2-FSK, ±4.5 kHz typical, VHF / UHF / 929–932 MHz commercial, 439.9875 MHz ham DAPNET.
https://www.sigidwiki.com/wiki/POCSAG
Cell, pagers, radios, and an online alpha pager gateway. The last kind of page-from-a-form shop.
http://www.socs.cc
Consumer two-way pager on ReFLEX. Smaller than the PageWriter, same return-channel idea.
https://en.wikipedia.org/wiki/Motorola_T900
Rust transmitter daemon for DAPNET. RasPager, RFM69, soundcard, Ericsson C9000. One binary for the usual ham TX pile.
https://github.com/rwth-afu/UniPager
European Radio Message System. 6250 bit/s four-level FSK. Dead commercially; listed so the protocol shelf is complete.
https://en.wikipedia.org/wiki/ERMES
FLEX one-way, ReFLEX two-way, InFLEXion voice. The Motorola family tree in one page.
https://en.wikipedia.org/wiki/FLEX_(protocol)
Short history and the three bit rates. Start here, then open M.584.
https://en.wikipedia.org/wiki/POCSAG
Vancouver-area telecom hardware for phone companies and high-tech shops. Paging speakers and SIP endpoints live in this catalog.
http://www.algosolutions.com
Cabling, voice mail, VoIP, paging accessories. The closet installer.
http://www.schwegel.biz
Windsor / Chatham shop: phones, pagers, two-way, internet, answering service.
http://www.kelcom.com
Two-way, cellular, wireless data, pagers. Sales, consulting, install.
http://www.mills-wireless.com
Motorola comms, paging, cellular. Not the cable company.
http://www.rogerstwoway.com
