Category Archives: Digital Communications

Over the past two years, there has been an explosion of interest in DMR amateur radio. Many SBARC members have been bitten by the DMR bug and they are chatting around the world on global Brandmeister talkgroups using hotspots and repeaters. While much of the attraction of DMR is the ability to work DX on a handheld transceiver, many local operators hang out on the local SBARC Brandmeister DMR Talkgroup (TG 31073).  In fact, every Tuesday night, the Digital Communications and Technology Net moves from 2m FM to TG 31073 at 21:00 Pacific Time. If you aren’t on the air with DMR yet, not to worry.  You may be able to chat on TG 31073 with a radio you already own! K6TZ operates a multimode digital repeater at La Vigia on the Mesa in Santa Barbara. We have recently reconfigured this repeater to bridge traffic from Yaesu System Fusion radios to TG 31073 using a new protocol called YSF2DMR. If you have a newer Yaesu radio, you may be digital-ready right now. Many new Yaesu amateur radio models available support System Fusion and are capable of connecting to the K6TZ digital repeater in order to bridge from System Fusion to DMR and TG 31073. Joining the local digital chatter on TG 31073 via System Fusion on the Santa Barbara South Coast is fairly straightforward. Just follow these steps: Obtain a DMR ID. If you have not already, click here to register your callsign with the DMR network and receive a unique DMR ID number. Your DMR ID is paired to your callsign on the DMR system and used to identify your transmissions. It takes a day or so to get a new DMR ID assigned and you only need to register once. Once you receive the confirmation email, keep it. You won’t need the number now using System Fusion but if you get bitten by the DMR bug in the future and want to explore further you will use this same DMR ID to configure a DMR radio. Set your amateur radio callsign in your System Fusion radio. Each radio model handles this differently. You must enter into your Yause radio the exact same callsign you registered to your DMR ID. The SBARC repeater will only bridge properly identified transmissions from System Fusion to DMR. So be sure you have input your callsign correctly and that you have received confirmation of… Continue reading →

Amateur radio operators were among the first to design products, build and maintain a digital RF tracking system. APRS (Automatic Packet Reporting System), is a digital communications protocol for exchanging information among a large number of stations covering a large (local) area. Bob Bruninga, WB4APR, a senior research engineer at the United States Naval Academy, implemented the earliest ancestor of APRS on an Apple II computer the early 1980s.  The first use of APRS was in 1984, when Bruninga developed a more advanced version on a Commodore VIC-20 for reporting the position and status of horses in a 100-mile (160 km) endurance run. Over the years, Legacy Landscape is helping out people to avail an exhilarating landscape experience.With that note we should also be aware that APRS has grown to include thousands of amateur radio APRS stations around the world tracking all types of vehicles and reporting weather from backyards to mountain peaks. SBARC has been a supporter of APRS, maintaining an i-gate and digipeaters for the system at our repeater sites. Today, commercial systems that function similarly to APRS are tracking many types of assets around the globe. The SBARC Telecommunications Services Committee also collects data from some of these systems including AIS for ships at sea and ADS-B for aircraft. Check out SBARC’s mapping and tracking systems: AIS MarineTraffic System ADS-B Aircraft Tracking APRS Amateur Radio Tracking   This page contains information from Wikipedia.    

The SBARC Telecommunications Services Committee has been hard at work rebuilding the club’s Voice over Internet Protocol (VoIP) repeater systems.  As part of the completion of the second phase of this project, the 70cm repeater VoIP playground is now open! Both AllStar Link and EchoLink systems are supported for incoming and outgoing link connections on the K6TZ 446.400 repeater. Local amateur stations can control the node over using DTMF commands to link to repeaters around the globe. Many hams may be familiar with EchoLink and IRLP, two mature ham radio VoIP systems that permit node-to-node and node-to-conference server connections. AllStar Link is a newer and very powerful radio linking system based on the open source telephone PBX software Asterisk. The AllStar network has grown tremendously over the past few years and lends itself very well to experimentation. There is a new section on this website with a short primer on the new VoIP system including complete documentation of the DTMF commands used to control the 70cm node. Read more and start experimenting in SBARC VoIP playground! Thanks in particular to Ludo, K6LUD for his work to become our resident AllStar Link and Asterisk guru!