CWtty

OUTIN

Transmit

Direction Material Characters Koch lesson

Group size Pattern hint Spacing

RX LISTENING

25050075010001250 Hz

ENV

LVL

Input Tune Filter Sensitivity AFC

Space straight key ← → paddles Enter new line Bksp delete

+ − sensitivity < > tune z zero-beat b B filter a AFC s speed lock

Space ← → transmit + − sensitivity < > tune z zero-beat

Enter start

Type answer Enter check, next Tab replay Esc setup

Space ← → send Enter check, next Tab hint Bksp retry Esc setup

Keyer Tone Speed Farnsworth Key with Paddle mode Swap paddles Volume Tone shape

Receiver Speed Lock speed Pitch Filter Sensitivity AFC

Transceiver Break-in delay Sidetone

Space: Straight key: the tone sounds while it is held
← →: Paddles: dit and dah (swap them in Settings). Iambic A, Iambic B, Ultimatic, Bug and Straight key modes
Touch: The Dit, Key and Dah buttons key like the keyboard
USB pad: A paddle seen as mouse buttons: set Key with to USB pad, keep the pointer over the page. Left is dit, right dah
+ −: Receiver sensitivity: higher catches weaker signals, lower rejects noise
< >: Tune by 10 Hz, or click the waterfall
z: Zero-beat: tune to the strongest signal
b B a s: Narrower, wider filter; AFC; lock the receive speed
TX/RX: Listens by default. Touch the key to transmit: the receiver goes quiet and comes back after the break-in delay
Training: Enter starts, checks and moves on. A wrong character restarts the item. Tab replays (copy) or toggles the hint (send), Esc goes back to the setup

CWtty, the PWA of the terminal app: the same C core, compiled to WebAssembly. Works offline once loaded. MIT License.