In this software-defined radio tutorial, I’ll set up a software-defined radio device (SDR) and an antenna, and listen to a conversation between two licensed ham radio operators via the Lahore repeater. Now, it’s possible for someone with a laptop and less than $30 worth of equipment to receive a wide range of radio frequencies, and we’ll be doing just that. Anyway, until the following video, guys, take care, and we see you in the next one.While radio has used fundamentally the same technology since Guglielmo Marconi first conducted his experiments in 1895, improved circuit design and signal processing techniques have allowed us to transmit much more and much farther out than before. I’ll be intrigued to know the frequencies and even what you’ve decided as well, especially if it’s outside of the hand bands. If you did, please like, please subscribe and also leave a comment down in the description below of what you’ve managed to decode with CW get and your SDR software. Anyway, guys, I hope you enjoyed the video. Go ahead and see if you can find some CW signals outside the hand bands and see what they’re transmitting. I’m using my new Erlich with the hammer-up converter. There are lots and lots of other people that use CW. Now CW doesn’t just broadcast on the ham HF bands. Do you see a waterfall in the bottom right-hand corner? All of those different lines going down, all the dots are different stations transmitting CW. In this particular example, a ham radio operator sent out his callsign, and I would imagine he is testing his transmitted before he starts calling c.q. It Wasn’t the best example of decoding CW, but it proves that you can use this CW to get the software to decode Morse code. So what you need to do is click your mouse in the center of that so that it knows where to grab it from, so let’s go ahead and have a little listen and see what we can pick up and decode. The only thing that you need to do in CW get is you can see the top white bar, and you’ve got a little kind of blue hump there that is the area of the audio spectrum that we’re going to be trying to decode some CW from. This is the first portion of 20 meters, and the application I’ve got running over on the left is called CW get, so it’s taking the audio output from the SDR console and pumping it straight into CW get. So at the moment, I’m looking at 20 meters. Hence, you want to make sure that the filter is as narrow as possible after selecting CW on this STR console version 3, you can make the band even narrower, so if you’ve got a powerful station next to the one that you’re trying to decode, then you can narrow it down by dragging the edges in. They can be very close together, which could affect the decoding. These stars are narrow and filter them because there are so many different transmissions of a CW taking place simultaneously, and the bandwidth is very narrow. So what we use in an SDR package is to make sure that we’re actually on the CW mode. But primarily if you’re going to be wanting to have a listen to some Morse code or decode some, then you’re going to be looking at some of the lower hand bands such as anything from 10 meters down to 20 down to 40 and down to 80 meters even 160 meters most of the activity like said before will always be at the beginning of the bands is that part of the band which is allocated specifically for CW. However, CW does operate upon VHF and UHF as well. Morse code is generally found around the beginning of each of the hand bands we’re talking about. So let’s go ahead and jump into where we’re going to find Morse code. If you want to find out some more information about this and the true history behind it, I’ll leave some links down in the description below, where you can go ahead and research as much as you like. The Morse code that we recognize today with the dots and dashes that equal letters and numbers were put together and invented and created by Alfred Vail. Samuel Morse invented the telegraph back in 1832. So it is widely believed today that the Morse code was invented by Samuel Morse back in the 1800s, which is not strictly true. So let’s crack on and find out a bit more about Morse code and how we can decode it, and even more where we’re going to find it. Now, okay, they don’t use Morse code in the matrix, so that’s enough of the matrix. Well, the closest thing that we’ve got to that in the real world will be the waterfall on an SDR software package. So if you guys have seen the film The Matrix, you can remember the iconic screen of seeing all these ASCII characters and funny, strange characters scrolling down the screen, and they were able to make out what was going on in the matrix just by viewing that code. Hi and welcome back to another tech minds video, so he saw my intro there this video will be all about Morse code and how you can decode it using an SDR receiver.
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