![]() When you are done, you will see a new audio device in your System Preferences → Sound, in both the Output and Input tabs. If you would like a commercially supported option, check out Loopback from Rogue Amoeba.Ĭhoose an option and install it using their instructions. It was originally supported by Rogue Amoeba, but is now in the hands of the original author. In my experience, Soundflower implements more of the audio driver API so you get less error messages when it comes to setting volume and such, but it has more trouble keeping up with Mac releases in its support history. An audio router is a special macOS audio driver that allows you to pipe the audio output from one application to the audio input of another app.īoth of these function pretty much the same. This is the “secret sauce” to the whole setup. ![]() However, you can get a RTL-SDR dongle for around $36, plug it into an available USB port and start receiving radio signals. To do that properly, you probably will need something like a Mobilinkd TNC3 or a SignaLink USB, both of which cost over $100. Most hams these days have one or more Baofeng radios on hand, and, while you can get your hands on them starting at $35, you would still need a way to interface it to your computer. To transmit, you will likely want to invest a bit more money in a quality radio. ![]() I’m going to be focusing on the receive aspect of APRS. In this post, I’ll show you how to set up what I think might be the least expensive setup for receiving APRS packets over radio, beyond the cost of the Mac itself, of course. One minor goal I had when creating QTH.app was to make it inexpensive and easy to get started with APRS on a Mac. ![]()
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February 2023
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