The Site is moving to N5AMD.com.

Welcome to San Antonio’s digital voice resource for local ham radio operators. The goal of this site is to be educational and informative for all things revolving around digital voice. Do you currently live in San Antonio? Are you visiting from out of town? The San Antonio area is growing rapidly with digital voice systems. Prior to 2017 there were only a handful of Yaesu Fusion repeaters. Within a years time digital voice has exploded and now offers several DMR and D-Star repeaters covering much of the area and continues to grow.

A unique digital voice system is installed that is not found in many other cities, yet. An agnostic digital voice system that cross-modes any of the 3 digital modes. Fusion, DMR, D-Star can now talk together in real-time. Do you have Yaesu Fusion, but your friend or family member has DMR or D-Star or vice versa? There are multiple repeaters in town tied to a system that will cross these boundaries for you.  More information HERE.

Head to the about page if you have any questions or updates for things that may be incorrect on the site. New to Ham Radio? Click HERE to get started.


Different Digital Modes


Yaesu Fusion


DMR (Digital Mobile Radio)

Apco Project 25

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

Comparison Chart

ModeAnalogD-StarDMRYaesu System Fusion
NetworksIRLP, ECO-LINK, All-StarREF, XLX, DCScBridge, Brandmeister, DMR-MARC, Many others...Wires-X, YSF, FCS
Server NomenclatureReflectorReflectorTalk GroupRoom, Reflector
Network interactionDTMF"UR" FieldContact or channel selectionDx Button, DTMF
Signal ValidationTONE, Tone-SquelchRPT 1 (only for repeaters)Color CodeN/A
ModulationFMGMSK 4-state FSK with TDMAC4FM
Verbal ID Required?YesNoYes (if your radio doesnt support "Talker Alias")No

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, Messages, and even data like images and text files 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


Feature Comparison

FeatureD-StarYaesu System FusionDMR
Link directly to users (Networked callsign routing)YesNoYes
Link to repeaters directlyYesYesYes
Text MessagingNoSort of, Must be in GM mode.Yes
GPS bearing of RX station on radioYesYesNo
Vendor lockedYes, sort of, Icom and 1 Kenwood radioYes, Yaesu onlyNo
Auto switches between Analog and DigitalYes, sort of, after ~10seconds Yes, InstantlyYes, only with certain model radios
Lone workerNoNoYes
Man downNoNoYes
TX/RX Computer dataYesNot yet. Only certain commercial vendors and radio models
Can build your own networkYesYesYes
Repeater RoamingNoNoYes
Can work on HFYesYesNo (~900 mile limit)