Welcome to the home of the San Antonio Digital Radio Club, SADRC. We are a group of individuals looking to advance and teach digital radio in the Amateur Radio community within the San Antonio area. Are you currently in the world of analog FM, looking to move to digital? You have come to the right place. We are continually adding How-to’s and expanding our club and site. Please feel free to contact us for any questions you may have regarding digital radio. We look forward to hearing from you. 73!

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Different Digital Modes


Yaesu Fusion

Icom D-Star

DMR (Digital Mobile Radio)

Apco Project 25

NXDN (Kenwood calls it NexEdge, Icom calls it IDAS but they are the same technology)


Why Digital radio?

It’s a natural progression of Radio. Consider it evolution of RF rather than change. Way back in the day, AM was the defacto modulation type. AM was noisy, but it got the job done. In 1933 the FM modulation type was invented and introduced into Radio. FM solved the noisy issues that was prominent in AM. For decades FM ruled the radio world and still does in many cases, but digital is here to overtake the modulation throne. Since digital is basically a transmission of data rather than raw voice, it can transmit more in a payload when a radio PTT is pressed. Things like user Identifiers, GPS positions, Short Messages, and TDMA are just some of the benefits. Here is a great article on analog vs digital.

Here is what the different digital modes sound like. (from http://www.w2sjw.com/radio_sounds.html)


Icom D-Star

Yaesu Fusion

DMR Repeater