PI4
 | |
|---|---|
| Frequencies | 136 kHz,472 kHz,3.5 MHz,5 MHz,7 MHz,10.1 MHz,14 MHz,21 MHz,24.9 MHz,28 MHz,50 MHz,70 MHz,144 MHz,220 MHz,430 MHz,902 MHz,1240 MHz,2300 MHz,2400 MHz,3300 MHz,5700 MHz,10000 MHz,1.8 MHz,18.1 MHz,40.7 MHz |
| Frequency Range | 136 kHz - 10000 MHz |
| Mode | USB |
| Modulation | MFSK |
| ACF | — |
| Emission Designator | — |
| Bandwidth | 709 Hz |
| Location | Worldwide |
| Short Description | PI4 (PharusIgnis4) is a 4-MFSK mode designed for amateur radio beacons. It is designed to work via different propagation modes. |
| I/Q Raw Recording | — |
| Audio Sample | |
PI4 (PharusIgnis4) is a 4-MFSKMultiple Frequency Shift-Keying mode designed for amateur radio beacons. It is based on JT4. PI4 is specifically designed to work via different propagation modes and on all amateur radio bands up to at least 10 GHzGigaHertz (GHz) 10^9 Hz.
Spacing of the MFSKMultiple Frequency Shift-Keying tones is most commonly about 234 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). which results in about 709 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). bandwidth. Total USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) bandwidth is about 1510 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). with typical 800 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). offset for the first tone. Other spacing options of 469 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., 563 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). and 703 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). can be used. One transmission takes 24.333 seconds. PI4 is theoretically decodable with signal-to-noise ratio of -22.2 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal..
PI4 beacons commonly transmit other modes in addition to PI4, typically CW or FSK-CW.
The name PI4 is short for PharusIgnis4 which comes from Latin "pharus" ("lighthouse") and "ignis" ("fire"), and 4 refers to the four MFSKMultiple Frequency Shift-Keying tones.
Frequencies[edit]
PI4 may be used on any amateur radio band where beacons are permitted. It may also be used by pirate beacons.Decoding Software[edit]
Video Examples[edit]
Additional Links[edit]
