DMR

 -------------------------------DMR----Digital Mobile Radio-------------------------------------------

Talking around the world with just a Tech license and an HT:   A DMR HT Radio allows one to connect to a DMR repeater.  DMR repeaters are interlinked with other repeaters around the world allowing one to talk to other hams virtually anywhere.

In the Tallahassee area there are repeaters (NX4DN) located at Greensboro in west Gadsden county near I-10  at 300 feet, a repeater in Tallahassee located downtown at 200 feet, and a repeater located in Metcalf on a tower at 1,000 feet.  All sites are networked together.  In addition to regional Talk Groups (TG), there is a local TG 9 talk group on each repeater and a local NX4DX network TG 2 talk group that activates on the 3 local repeaters in unison. The NX4DX DMR repeaters do not use K4USD (as noted on RadioId.net), rather the run their own c-Bridge:  http://C-Bridge.nx4dn.org:42420

The NX4DN DMR Repeater Configuration obtained from RadioId.net:

======== Metcalf, GA ========

Callsign: NX4DN 

Frequency: 444.13750 

Offset: +5.000 

Color Code: 1


======= TLH Downtown ======

Callsign: NX4DN 

Frequency: 443.13750 

Offset: +5.000 

Color Code: 1


============= Greensboro Interstate-10 ========

Callsign: NX4DN 

Frequency: 444.98750 

Offset: +5.000 

Color Code: 1


########### TALK GROUPS ###############

The NX4DN Tallahassee DMR Repeaters have the following Talk Group configured.  Only these TG and corresponding Time Slots (TS)  are assessable from these repeaters.  There is no Parrot Talk Group (public or private).


TS 1 TG 3 North Amer

TS 2 TG 3174 SE Regional

TS 2 TG 3112 Florida State wide

TS 2 TG 2 Local Network

TS 2 TG 9 Local Rptr

TS 2 TG 310 

TS 2 TG 3172 NORTHEAST REG

TS 2 TG 31121 FIRST COAST

TS 1 TG 311307 KINGSLAND GA


SUGGESTIONS FOR GETTING STARTED ON NX4DN

Note: Tier 2 repeaters have two time slots: TS1 & TS2 (also referred as "Repeater Slots").  This in effect can make the DMR repeater act like two independent repeaters.  Additionally, all above repeaters use Color Code (CC) 1.  The Color Code acts like a Tone Squelch activating the DMR repeater for use.  The example below uses the open source project OpenGD77. OpenGD77 provides a greatly, greatly, (emphasized greatly) improved firmware and programming CPS software (See https://opengd77.com for details).  The OpenGD77 CPS program utilizes TG Lists and TG override TS settings.  As illustrated below, this hugely simplifies creating a CodePlug.  Many CPS CodePlug programs do not have these features, but a work around is provided below. 



ADDING DMR PEER to PEER (AKA Simple Xchange)

DMR Community Recommended for Peer to Peer Frequencies

Use: TG99; CC1; TS1; Admit Criteria:Always; InCall Criteria:Always(or TX)