Motorola
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One-way alphanumeric workhorses. POCSAG and later FLEX. The belt clips that outlived the carriers.
https://en.wikipedia.org/wiki/Motorola_Advisor
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
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
Consumer two-way pager on ReFLEX. Smaller than the PageWriter, same return-channel idea.
https://en.wikipedia.org/wiki/Motorola_T900
