PACTOR Series: PACTOR I - PACTOR II - PACTOR III - PACTOR IV
PACTOR-I is a digital data protocol combining elements of PACKET and AMTOR ARQAutomatic Repeat reQuestAutomatic Repeat Query.
PACTOR-I is used by many groups, including Sailmail for mariners to send and receive emails. It is also used by Ham Radio operators, Governmental and Diplomatic agencies, and even NGO's. PACTOR-I is also used as a Selcall protocol to establish connections with other PACTOR modems. PACTOR-II, III, and IV modems all use PACTOR-I for selcalling.
PACTOR I has 200 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. rate, Huffman compression technique, uses 2 FSKFrequency-Shift Keying tones with a shift of 200Hz, and true binary data transfer capability. Created by Ulrich Strate (DF4KV) and Hans-Peter Helfert (DL6MAA) in 1990.
Standard PACTOR I:
|PACTOR I FSP||PACTOR I FECForward Error Correction||PACTOR I SELCALL|
FSP = Free-Signal Protocol. The basic idea behind the "Free-signal" (FS) is that the host (e.g. a maritime coast station), advises all clients that at present there is no link in opera- tion i.e. it is free, by transmitting an often repeated special signal. Clients hearing this signal may call.
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