PACTOR IV

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PACTOR IV
PACTOR IV.jpg
Frequencies 3 MHz,30 MHz
Frequency Range 3 MHz - 30 MHz
Mode USB
Modulation PSK,QAM
ACF
Bandwidth 2.4 kHz,300 Hz
Location Worldwide
Short Description PACTOR IV is the newest iteration of the PACTOR series, advancing from PACTOR I-III. It is 1.5x-3x faster than PACTOR III, and has 10 speed levels.
I/Q Raw Recording
Audio Sample
PACTOR Series: PACTOR I - PACTOR II - PACTOR III - PACTOR IV 

PACTOR IV is the newest iteration of the PACTOR series, advancing from PACTOR I-III. It is 1.5x-3x faster than PACTOR III, and has 10 speed levels.

This is a proprietary standard developed by SCS GmbH & Co. KG, Hanau, Germany. This mode is used exclusively in SCS's P4dragon series of shortwave data modems. The P4dragon series modems are all backwards compatible with PACTOR I-III, and, like PACTOR II and III, uses PACTOR I SELCALL to establish connections with other modems.

PACTOR 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 IV's 10 Speed Modes
Speedlevel Modulation Gross rate Net rate [bpsBits per second (bps)]
1 2-Ton-Chirp 113 46,9
2 DQPSKDifferential Quadrature Phase-Shift Keying, Spread-16 225 85,32
3 DQPSKDifferential Quadrature Phase-Shift Keying, Spread-16 225 147,2
4 DQPSKDifferential Quadrature Phase-Shift Keying, Spread-8 450 300,8
5 BPSKBinary Phase-Shift Keying (1 bit per symbol) 1800 433,1
6 BPSKBinary Phase-Shift Keying (1 bit per symbol) 1800 1096,5
7 QPSKQuadrature Phase-Shift Keying (2 bits per symbol) 3600 2199,5
8 8-PSK8-Phase Phase-Shift Keying (3 bits per symbol) 5400 3304,5
9 16-QAMQuadrature Amplitude Modulation 7200 4407,5
10 32-QAMQuadrature Amplitude Modulation 9000 5512,5

Audio Sample[edit]

Initial SELCALL with beginning PACTOR IV data transmit. Using Speed Level 6.

PACTOR IV Data transmit

Decoding Software[edit]

Professional Equipment/Software

Video Examples[edit]

Free-to-Use Competitors[edit]

Since PACTOR hardware modems are relatively expensive, the WINMOR and ARDOP software modes were developed after PACTOR to give amateur radio operators a means to send email over radio for free. VARA, which is a shareware mode, may have been developed as a lower-cost competitor to PACTOR III with similar transmission speeds, though PACTOR's reliability is said to be better than VARA.

Winlink[edit]

Winlink (formerly RMS Express) is an amateur radio global radio messaging service which can relay messages sent by radio to conventional e-mail servers. Winlink's radio messaging software client is called Winlink Express. Winlink Express is compatible with several PACTOR hardware modems, as well as WINMOR, ARDOP, and VARA. Winlink Express is available for Windows users only (or other x86 operating systems if run with Wine). Linux, Mac, and Raspberry Pi users may use Pat, which is compatible with PACTOR, WINMOR, and ARDOP.

Additional Links[edit]

Additional Images[edit]