PACTOR I

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PACTOR Series: PACTOR I - PACTOR II - PACTOR III - PACTOR IV 
PACTOR I
PACTOR Addimg.jpg
Frequencies 3 MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
,30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
3,000 kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
30,000 kHzKiloHertz (kHz) 10^3 Hz
30 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
- 30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation FSKFrequency-Shift Keying
ACFAutoCorrelation Function
Bandwidth 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).0.3 kHzKiloHertz (kHz) 10^3 Hz
3.0e-4 MHzMegaHertz (MHz) 10^6 Hz
0.3 kHzKiloHertz (kHz) 10^3 Hz
3.0e-4 MHzMegaHertz (MHz) 10^6 Hz
0.3 kHzKiloHertz (kHz) 10^3 Hz
3.0e-4 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description PACTOR-I is a digital data protocol combining elements of PACKET and AMTOR ARQAutomatic Repeat reQuestAutomatic Repeat Query.
I/Q Raw Recording
Audio Sample
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.

Audio Sample[edit]

Standard PACTOR I:

Other PACTOR I Variants
PACTOR I FSP PACTOR I FECForward Error Correction PACTOR I SELCALL
PACTOR FSP.jpg
PACTOR-FEC.jpg
PACTOR SELCALL.jpg


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.

Decoding Software[edit]

Hobby Level Software


Professional Equipment/Software

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