Home News Meeting Announcements Jan 5 Program: DMR - Digital Mobile Radio

DFMA Repeaters

Hillsborough
147.225+ PL:82.5
224.260 -
443.1375+ DMR

TV Hill
145.450 - PL:82.5
444.100+ PL:82.5

VA Hospital
444.450+ PL:100.0

[more repeater info]

Jan 5 Program: DMR - Digital Mobile Radio Print E-mail
Written by KU4GC   
Thursday, 31 December 2015 10:34

Charlie Durst, NC4CD, will present a program on Digital Mobile Radio.  He reports: "Amateur radio has gone from spark gap to cw to voice via amplitude modulation and then single sideband.  Hams also began to convert business band radios to the ham hands to use frequency modulation and repeaters.  Along the way digital modes got their start with teletype machines, tnc’s, and many variations, all for data transmission.  Now we have technologies for digital voice transmission.  DSTAR was developed in Japan by Icom and is in use all over the world.  Not to be outdone, the hams at Motorola adapted their company’s new digital voice technology for use by the ham world.  Motorola calls it Mototrbo and the hams call it DMR, digital mobile radio.   DMR repeaters all over the world are linked via the internet and provide great communications between HT’s and mobiles everywhere.  A DMR system has been established in the Carolinas.  I will go into more detail in this program."

Charlie is a founding member of the DFMA and is, of course, our Repeater Manager.  He has presented several programs to the club in the past including some spectacular video footage related to towers.  He was first licensed in 1960 as WN4COZ, upgraded to General in 1961 becoming WA4WTX and later upgraded to an Advanced license.  In 2006 he acquired the vanity call NC4CD.  He earned his BSEE from Auburn University and worked as an engineer for GTE for 23 years.  Upon retiring from GTE he started Communications Structure which builds towers and leases space on them to wireless companies.

 
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