Fldigi morse decoder generator#
Fldigi morse decoder software#

I cut it using 6mm clear acrylic at 100% power, 4% speed, and etched the raster at 100% power, 20% speed.

Fldigi morse decoder generator#

The case is made using my laser cut box generator and thing:17901. It should appear as a generic USB keyboard and work with any application. If the input sequence is not a valid Morse code, the timer 0 is switched to a slower speed, which causes OC0A to be driven at half speed, or 249 Hz, which will indicate an error tone.įull source for the Teensy is available for your own use.

Fldigi morse decoder software#

Software controls the volume in a crude fashion by limiting the on-time of the square wave. Sending CW without audio feedback is very hard, so a tone is produced via PWM on OC0A at 498 Hz, directly into a speaker scavenged from an old headset. This makes it feasible to run the entire decoding stack in a small microcontroller like the ATMega32U4. But with the iambic paddle, the operator has input the separate symbols so there is no difficult step to determine the code. With a straight key the computer would need to estimate the codes per minute and try to differentiate dits from dahs. If neither is pulled low within the time of two dits, the current bit-stream is looked up in a table and if there is a valid USB keyboard event in the table it will be sent to the host computer. It runs a state machine that listens for PIND4PINB4 to be pulled low to indicate a dah, or PIND5PINB5 to be pulled low for a dit. The paddle itself doesn't generate the code this is the responsibility of the radio, or in this case, of the Teensy 2.0. Typically the dah is three time as long as the dit. If both are held in, they will alternate between the two symbols.

If an input is held in, it will repeat at a pre-programmed speed. Iambic paddles are very different from straight keys in that they have two inputs: one for 'dit' and one for 'dah'. The machine is in the backroom at NYCR and can be operated by members with general class amateur radio licenses from anywhere, using xvnc to display the fldigi application.īut operating it with a keyboard has none of the feel of an old fashioned QSO, so I designed an interface for Dave's BY-1 Bencher Iambic Paddle. Have you switched your QSOs to PSK31 or some other digital mode, but miss the joy of sending CW with an iambic paddle? Then here's a project for you.īill Ward (KD4ISF), Guy Dickenson (KD7TJJ) and Dave Clausen (W2VV) setup a club call sign N2YCR and a remotely operated computer station running fldigi for PSK31.