JS8
 | |
|---|---|
| Frequencies | 3.578 MHz,14.078 MHz,18.104 MHz,21.078 MHz,24.922 MHz,28.078 MHz,50.318 MHz,1.842 MHz,7.078 MHz,10.13 MHz,27.245 MHz |
| Frequency Range | 1.842 MHz - 50.318 MHz |
| Mode | USB |
| Modulation | GFSK |
| ACF | — |
| Emission Designator | — |
| Bandwidth | 50 Hz |
| Location | Worldwide |
| Short Description | JS8Call is an extremely-weak-signal amateur radio communication mode based on FT8. It allows FT8 to be used for conversations and message relaying. |
| I/Q Raw Recording | — |
| Audio Sample | |
JS8Call (JS8) is an amateur radio QSO communication mode based on FT8. It is popular among amateur radio operators for its ability to send and receive messages despite challenging propagation conditions, high noise environments, low power operations (QRPIn amateur radio, QRP operation refers to transmitting at reduced power while attempting to maximize one's effective range.), or even compromised antennas.
JS8Call turns FT8 into a "chat" mode, allowing stations to send longer messages "keyboard-to-keyboard." JS8Call can be thought of like a very weak-signal radio broadcast form of 'e-mail' (though it is not e-mail), where operators can check their message inbox and reply later. Messages can also be sent out to be relayed through other operators to reach a recipient operator. JS8Call conversations can also be had in real-time.
JS8Call was created by Jordan Sherer (KN4CRD) and first released January 04, 2019. Later releases of JS8Call added more features to the mode, such as higher-speed transmissions.
Frequencies[edit]
"From version . 0.5.x the default calling frequencies set up in JS8Call are listed below, but please note these are not set in stone and can easily be changed in your settings, or you can simply manually retune your radio to another frequency." JS8Call is designed as an HFHigh Frequency (3-30 MHz) mode, but (as with any amateur radio mode) can also be used on VHFVery High Frequency (30-300 MHz)/UHFUltra High Frequency (300-3000 MHz) if desired.
| Common Frequencies for FT8 & JS8Call | |||
|---|---|---|---|
| Band | Frequencies (MHzMegaHertz (MHz) 10^6 Hz) | IARU Region | |
| FT8 | JS8Call | ||
| 160m | 1.840 | 1.842 | All |
| 80m | 3.573 | 3.578 | All |
| 60m | 5.357 | ||
| 40m | 7.056 | Region 1 | |
| 7.071 | |||
| 7.074 | 7.078 | All | |
| 30m | 10.132 | 10.130 | Region 1 |
| 10.133 | |||
| 10.136 | All | ||
| 20m | 14.071 | ||
| 14.074 | 14.078 | All | |
| 14.090 | Region 1 | ||
| 17m | 18.100 | 18.104 | All |
| 15m | 21.074 | 21.078 | All |
| 21.091 | |||
| 12m | 24.915 | 24.922 | All |
| 11m | 27.245 | All | |
| 10m | 28.074 | 28.078 | All |
| 6m | 50.310 | ||
| 50.313 | 50.318 | All | |
| 50.323 | 50.328 | All / Intercontinental DX | |
| 4m | 70.100 | Region 1 | |
| 2m | 144.174 | All | |
| 1.25m | 222.065 | ||
| 70cm | 432.065 | ||
Grayed-out cells are commonly-used frequencies which are not included in the default program settings of JS8Call or WSJT-X (FT8). Frequencies for JS8Call and FT8 are adjustable by the user. "Conventions may change with time or by user preference."
(Sources: WSJT-X 2.1.0 Program default settings, DXZone, WSJT-X Documentation, JS8Call Documentation)
