If you watch closely, you will see the red vertical bars in the waterfall spread apart to accept a wider signal, as shown at right. You have the RxID button turned on, so your copy of fldigi accepts this command and changes mode. Shortly after this file begins, the transmission you are receiving contains a command to change from the MFSK-32 operating mode to the MFSK-64 operating mode. Un-check the box at "File|Audio|Playback" to stop playback, or allow it to continue playing to the end of the file. The specified file will then begin playing. You will probably want to answer the question "playback continous loop?" with "No". Locate and select file D1.2.3.wav in your workspace folder and press the Open button. Use "File|Audio|Playback" and check the checkbox. In this exercise, you will simulate the reception of a digital signal containing an RsID code that causes your copy of fldigi to change operating modes during the transmission. This transmission was made by fldigi transmitting an MFSK-32 signal with the content shown. Un-check the box at "File|Audio|Playback" to stop playback, or allow it to continue playing to the end of the file.Īs the file "plays", fldigi's waterfall pane should appear much the same as it did during Exercise 1, but you should see text in the receive pane as shown at right. You will probably want to answer the question "playback continuous loop?" with "No". (See NBEMS menus and configuration for help with the "W|X" and "Y~Z" method of describing software menus and configuration.) Locate and select the first file to be played, D1.2.1.wav, in your workspace folder and press the Open button. (Using this link will open the page in a separate browser window or tab.) In this exercise, you will learn how to use fldigi's File|Audio|Playback command and simulate the reception of a simple digital signal.Įxercise configuration: Before beginning this exercise, follow the steps outlined on the Off-the-air exercise preparation page. Filesĭownload these files, one by one, and save each of them to your workspace folder: As with any digital transmission, you are responsible for setting fldigi to receive the OpMode that will be transmitted (unless you have RxID checked and the recording provides a RSID signal) and for aligning reception with the incoming signal on the waterfall. In some cases, fldigi can interpret an image and display the image in a separate popup window. If the audio is in a digital-radio format supported by fldigi and fldigi is configured for it (the correct waterfall tuning and OpMode area selected), fldigi will interpret the transmission and display received text in its Receive panel. wav-format audio file and will behave as if it is receiving the audio as a radio transmission. fldigi's "File|Audio|Playback" menu item will "play" any. You can receive a real transmission over the air only if you can hear one being sent, and you may not be able to schedule one at your convenience . In Step 1.2 of this course, you will get experience in receiving digital transmissions using fldigi. next page Step 1.2: Using fldigi's Playback control Background.
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