![]() ![]() This is much more narrow than even the sharpest filter you’d use for regular Morse code operation.Ī common practice is to employ frequency shift keying (FSK) for QRSS. 013 words per minute and supports a filter bandwidth of about. So how slow is slow? The beacon, for example, sends an element - not a word or a character - every 90 seconds! That’s about. ![]() You can see a video introduction to the mode from and, below. Having a QRSS signal detected around the world from a transmitter running much less than a watt is quite common. Because the data rate is so slow, the computer has time to do extreme methods to recover the signal - essentially, it can employ an extremely narrow filter. So hams are using very slow code, and listening for it using computerized methods. In ham radio parlance, QRS means “send slower”, so QRSS has come to mean mean “send very slowly”. Like most communication methods, the slower you go the easier it is to get a signal through. This is partly because it is extremely narrow bandwidth and partly because your brain is an amazing signal processor. In addition, Morse code is highly readable, even under poor conditions. First, building transmitters for Morse is very simple. ![]() There are a few reasons code performs better than voice and many other modes. The software is QrssPiG and it can process audio or use a cheap SDR dongle. Now, hams are using the Raspberry Pi to receive highly readable Morse code using very low power. That requirement has gone in most places, but code is still useful and many hams use it, especially hams that like to hack. It wasn’t long ago that you needed to know Morse code to be a ham radio operator. ![]()
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