First generation pager systems (beep-only and/or voice) were assigned to the
VHF bands, 33-50 MHz and 139-175 MHz. Today, paging services are assigned
VHF, UHF, and 900 MHz carrier frequencies as shown below.
Paging Band Frequency Range
VHF low band 33-50 MHz
VHF high band 138-175 MHz
UHF
406-422 MHz
UHF high 435-512 MHz
‘900’ band 929-932 MHz
In 1978, to accommodate more pages sent per hour per frequency and to include
numeric or alphanumeric messages in a pager signal, a standards group formu-
lated a new paging format referred to at that time as POCSAG. This pioneering
planning was carried out by the Post Office Code Standardization Advisory
Group (POCSAG). A bit later the International Radio Consultative Committee
(CCIR), a committee of the International Telecommunication Union (ITU), re-
named the POCSAG code as Radiopaging Code No. 1 (RPC1) and specified its
format in their Recommendation for International Paging, R-584-1. We’ll con-
tinue to refer to the RPC1 as POCSAG. This protocol for sending paging mes-
sages is today’s defacto standard and its details are presented in Anderson’s
“Paging Handbook for the Radio Amateur”.
Technical note: You’ll hear talk about Golay Sequential Code (GSC), Flex, and the
Advanced Paging Operator Code (APOC) paging formats. GSC systems (and pag-
ers) are still in use in the US today, particularly in hospitals, but their numbers are
now small compared to POCSAG systems. Motorola has introduced and is pushing
their new 4-level FSK system, Flex, designed for higher speeds. (Flex is a trade-
mark or registered trademark of Motorola.) The APOC specification was written at
Phillips Telecom and they are promoting it. None of these paging formats are rele-
vant to paging with the TNC; the TNC features POCSAG only.
Amateur Paging
You might wonder at this point how this all fits with amateur radio. Can we retro-
fit commercial pagers for amateur use? Can we encode pages? Can we transmit
pages? And can we monitor pages? As it turns out, we’re in luck on all four
points!
Paging
Modes of Operation
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