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#Best cw decoder how to#
#Best cw decoder code#
#Best cw decoder download#

The on-to-off is the "Lower" value and the off-to-on the "Upper." This implementation provides a hysteresis detector. These signal levels are relative to the average signal level. You can set the threshold for detecting when the signal transitions from off-to-on and on-to-off. When tracking is enabled the tracking filter is reset every time the transmit WPM is adjusted.ĬW detection is basically an amplitude demodulator. The tracking range (+/- Hz around the TxWPM setting) can be set using the "Rx Trkg Rng" control. Enable Rx WPM tracking by enabling the check box "Enable Tx Trkg". A lot of impuse noise (static) can cause either filter to ring and increasing the filter bandwidth might improve detection in that electrical environment.įldigi can track the incoming signal. Selected a "Matched" filter for either the FFT or FIR implementation optimizes the filter bandwidth for white noise suppression. The FIR filter may give better response with impulse noise. The FFT filter is optimum when receiving CW in a white noise environment. Unchecking the FFT filter causes the decoder to use a Finite Impulse Response (FIR) filter with a cutoff slope that is not as steep. This is a very steep sided low pass filter. The Fast Fourier Transform (FFT) filter is implemented with a sin(x)/x impulse response. The CW decoder can use one of two different DSP filters. It is the digital equivalent of tuning an analog USB transceiver so that the carrier is exactly at the CW carrier frequency.

The CW signals are converted to a baseband signal. During operation the Rx and Tx WPM settings are annunciated on the status bar in the two boxes next to the mode indicator. You can also open up the CW tab by first selecting CW as the operating mode and then clicking on the left-most item "CW" on the status bar at the bottom of the fldigi main window. You can open that tab by selecting the "Configure/Modems" menu item and the clicking on the Modems/CW tab. The operating controls for CW are found on the Config/CW tab.

#Best cw decoder code#

At this point you can vary the CW player tone frequency, the CW player speed and the computer volume to get the best audio signal to your CW decoder.Fldigi can send and receive morse code from 5 wpm to 200 wpm.

Tap the red character spacing button to select either “no spaces” or “single spacing”–single spacing works best for reading.

At this point you should now see the CW decoder operating as it should, reading off the CW file you are playing on the CW player on your computer.

Push the reset button on the CW decoder.

Set your CW player speed to 22 words per minute.

Set your CW player tone to 690 Hertz on your computer.

Turn the tone frequency adjust all the way clockwise.

While the CW player is running, you should hear it playing, but may not see anything on the screen but a string of “I’s” and “E’s”–believe it or not, this is a good sign.

Connect a cable between the CW decorder’s audio output and a speaker or just use a headphone set.

Connect a cable between your computer’s audio output to the CW decoder audio input.

Create a CW file and run it on the Morse Code player.

#Best cw decoder download#

Find a CW Morse Code player such as “MorseCat 2.0” online and download it to your computer.

Note whether the LCD is too dark or too bright and adjust accordingly with the LCD adjust.

Plug in a 9-12 volt power source into the power input plug.

Turn the LCD adjust all the way counterclockwise and then back clockwise a few degrees.

Remove the LCD by gently lifting the LCD header pins out of their sockets.

The LCD is easily removed by pulling it straight up off of its header pin connectors to illustrate where to plug in your audio input and your audio output as well as display the LCD control adjustment, the tone frequency adjustment, the start/reset button and the character spacing button.

#Best cw decoder how to#

However, after obtaining some Chinese character translation help and spending a couple of hours putzing around with it, I then happened upon how to work the device. My first attempts to see if it really works were fruitless. There were no instructions, schematics or clear labeling in English to indicate how to use the decoder.

I recently ordered a China-made CW decoder on eBay for $12 out of curiosity as to how well it actually works and, to potentially use in a 40 meter Arduino Nano CW transceiver that I am building per plans from the March 2016 issue of QST.ĭelivery took 4 weeks and the decoder arrived intact as shown in the post featured image.