![]() ![]() ![]() 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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