CC JTTY — Digital Mode Plugin for HamSphere 5.1
The HamSphere JTTY Plug-in
CC JTTY brings JTTY, the brand-new digital mode from the WSJT-X team (the people behind FT8), right into your HamSphere station. JTTY feels like classic RTTY — type, press a key, and your text goes out — but under the hood it uses FT8-family technology with error correction, so you get clean copy instead of garbage characters. No UTC clock sync, no 15-second cycles: transmit whenever you like. Perfect for fast contest exchanges and real keyboard-to-keyboard QSOs.
Key features:
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Whole-band decoder — every JTTY station between 300 and 2800 Hz is decoded at the same time, each on its own line, just like an FT8 band activity window. Text appears live, frame by frame, as it arrives.
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Click-to-work — click a received line and the station’s callsign drops into the DX call box and your TX moves to their frequency. Or click the waterfall to set your TX frequency, and fine-adjust with the mouse wheel (±1 Hz, Shift for ±10 Hz) or the arrow keys.
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F1–F8 contest macros — CQ, EXCH, TU, MY call, HIS call, AGN?, HIS AGN? and NR, using the same message forms as WSJT-X so they pack into the fewest frames. Press the F-key and it goes out instantly; hold Shift to add it to the TX box instead. Your callsign, the DX call and the serial number are filled in automatically.
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Colour-coded receive window — CQ calls in cyan, messages to you in orange, your own transmissions in yellow, and incomplete messages dimmed. Every line shows UTC time and frequency. Scroll back with the mouse wheel; your place holds even as new text arrives.
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Live stats — mode, TX frequency, frames decoded and sync quality of the last decode, updated in real time.
How to operate:
Open the plugin and leave the decoder on ALL — every JTTY signal in the passband will start appearing in the receive window. To answer a station, click its line: the callsign and frequency are picked up for you. Press F2 to send your report and serial number, then F3 to say TU. To call CQ, click a clear spot on the waterfall and press F1. For a chat, click the TX box, type your message and press Enter — the plugin handles PTT, modulation and timing automatically. There is no clock to synchronise and no cycle to wait for: transmit whenever the frequency is clear.
Technical:
JTTY as introduced in WSJT-X 3.2. 4-GFSK modulation (BT 2.0) at 31.25 baud with 31.25 Hz tone spacing, about 127 Hz occupied bandwidth. Each 1.888-second frame carries 13 synchronisation symbols and 46 data symbols; a message is 1 to 16 frames. 34-bit payload protected by CRC-12 and a tail-biting convolutional code (K=10, rate 1/2), decoded with a wrap-around Viterbi decoder. Structured source coding packs callsigns, CQ calls, reports, serial numbers, grid locators, ARRL sections and control phrases into single frames; free text is sent five characters per frame. Streaming receiver with sliding-DFT sync search across the passband, time/frequency refinement, CRC and grammar validation, duplicate suppression and per-station message assembly. Transmitted waveform verified sample-for-sample against the reference JTTY implementation. 512-point FFT waterfall with adaptive AGC.
CC JTTY puts the newest digital mode in amateur radio on the air in HamSphere, wrapped in the clean and intuitive CC-Line interface you already know.
JTTY protocol by the WSJT Development Team. Compatible with all HamSphere skins. Requires HamSphere 5.0 or later.
6 ready to use colors schemes - 3 light and 3 dark2 custom schemes with unlimited colors