The K4USD Network
Administrator: John Burningham, W2XAB
w2xab@arrl.net

The K4USD Network is operated by the US Digital Amateur Repeater Club (K4USD) using multiple c‑Bridges™ to interconnect Motorola Mototrbo™ repeaters together and peering with other DMR bridge providers including DMR-MARC, DMRX, DMR+, Brandmeister, and 27 other regional DMR networks.

Our main c-Bridges™ are located in a multihomed data center near Dayton Ohio on dedicated servers. We currently support repeaters in 16 states and DC in a managed network; we accept all amateur Mototrbo™ repeaters (XPR8300, XPR8380, XPR8400, MTR3000, SL1000, SL5700, SL8000) and do not charge any fees, although we do accept donations.

We offer a wide variety of general public Talk Groups (TGs) listed below. We also offer some local/regional TGs not listed below on request. If a repeater owner/operator wants a TG not listed, they should contact the administrator.

The K4USD Network supports text messaging on TS2 within the network and linked to DMRX for other bridges wishing to participate. We do NOT support APRS because of FCC Part 97 identification requirements as DMR radios do not transmit a callsign. Please check with your repeater owner/operator to see if they allow text messaging on their repeater.

Repeater users should contact the repeater owner/operator for the TGs available on the repeater and time slot (TS) used for each TG. The TS listed below for the network wide TGs are the network default configuration which may vary for specific repeaters.

Talk Group Name	TG	TS	Comments
DMR-MARC WW	1	1	World Wide (DMR-MARC)
Local 2	2	2	Local Area Network (defined by the local repeaters)
DMR-MARC NA	3	1	North America (DMR-MARC)
Local 8	8	2	Secondary Local Area Network (if available, also TS1 on some rpts)
Local 9	9	2	Local Repeater Only
Brandmeister WW	91	1	World Wide (BM)
Brandmeister NA	93	1	North America (BM)
DMR+ USA	133	1	DMRPlus USA (Reflector 4639)
USA	1776	2	USA Talkgroup
Bridge	3100	2	“The Bridge” (DMRX & Brandmeister)
WW-German	10	1	WW German Language (DMR-MARC)
WW-German UA1	110	2	WW German Language UA1 (DMR-MARC)
WW-German UA2	120	2	WW German Language UA2 (DMR-MARC)
WW-English	13	1	WW English Language (DMR-MARC)
WW-English UA1	113	2	WW English Language UA1 (DMR-MARC)
WW-English UA2	123	2	WW English Language UA2 (DMR-MARC)
WW-Spanish	14	1	WW Spanish Language (DMR-MARC)
WW-Spanish UA1	114	2	WW Spanish Language UA1 (DMR-MARC)
WW-Spanish UA2	124	2	WW Spanish Language UA2 (DMR-MARC)
WW-Any Language UA1	119	2	WW Any Language UA1 (DMR-MARC)
WW-Any Language UA2	129	2	WW Any Language UA2 (DMR-MARC)
Comm1	3777215	1	Original Talk Groups from 2009 on TRBO-6 (DMRX)
Comm2	3777216	2	Original Talk Groups from 2009 on TRBO-6 (DMRX)
TAC-1	8951	2	Tactical Channel (DMRX)
TAC-310	310	2	Tactical Channel for QSOs (DMRX) (Linked to BM)
TAC-311	311	2	Tactical Channel for QSOs (DMRX) (Linked to BM)
TAC-312	312	2	Tactical Channel for QSOs (DMRX) (Linked to BM)
TAC-313	313	2	Tactical Channel for QSOs (DMRX)
TAC-314	314	2	Tactical Channel for QSOs (DMRX)
TAC-315	315	2	Tactical Channel for QSOs (DMRX)
TAC-316	316	2	Tactical Channel for QSOs (DMRX)
TAC-317	317	2	Tactical Channel for QSOs (DMRX)
TAC-318	318	2	Tactical Channel for QSOs (DMRX)
TAC-319	319	2	Tactical Channel for QSOs (DMRX)
Midwest Region	3169		ND SD NE MN IA MO WI IL MI IN OH (DMR-MARC) (DMR+ 4640)
Northeast Region	3172		NY NJ VT MA CT NH RI ME (DMR-MARC) (DMR+ 4642)
Mid-Atlantic Region	3173		PA WV VA MD DE DC (DMR-MARC) (DMR+ 4643)
Southeast Region	3174		AR LA KY TN MS AL GA FL NC SC (DMR-MARC) (DMR+ 4644)
Southern Plains Region	3175		KS OK TX (DMR-MARC) (DMR+ 4645)
Southwest Region	3176		CA NV AZ NM HI (DMR-MARC) (DMR+ 4646)
Mountain Region	3177		AK WA OR ID MT WY UT CO (DMR-MARC) (DMR+ 4647)
JOTA	907	2	Boy Scout Jamboree-on-the-Air (BM)
JOTA TAC1	9071	2	Boy Scout Jamboree-on-the-Air TAC-1 (BM)
JOTA TAC2	9072	2	Boy Scout Jamboree-on-the-Air TAC-2 (BM)
Delaware	3110	2	DE State TG
District of Columbia	3111	2	DC Wide TG
Florida	3112	2	FL State TG
Georgia	3113	2	GA State TG
Illinois	3117	2	IL State TG
Indiana	3118	2	IN State TG
Iowa	3119	2	IA State TG
Kentucky	3121	2	KY State TG
Maryland	3124	2	MD State TG
Massachusetts	3125	2	MA State TG
Michigan	3126	2	MI State TG
Minnesota	3127	2	MN State TG
Missouri	3129	2	MO State TG
New Jersey	3134	2	NJ State TG
New York	3136	2	NY State TG
North Carolina	3137	2	NC State TG
Ohio	3139	2	OH State TG
Pennsylvania	3142	2	PA State TG
Rhode Island	3144	2	RI State TG
South Carolina	3145	2	SC State TG
Tennessee	3147	2	TN State TG
Texas	3148	2	TX State TG
Virginia	3151	2	VA State TG
Wisconsin	3155	2	WI State TG
Crossroads	8710	2	Indiana Statewide TG
First Coast	31121	2	NE Florida
Net31001	31001	2	Scheduled Nets (BM)
Net31002	31002	2	Scheduled Nets (BM)

Some documents, files and links of interest to the Amateur community:

Amateur Radio Guide to Digital Mobile Radio (DMR): http://guide.k4usd.org

Technician Study Cards: http://technician.k4usd.org

K4USD Peer Watch: http://cbridge.k4usd.org:42420/PeerWatch

K4USD Net Watch: http://cbridge.k4usd.org:42420/MinimalNetwatch

Network Statistics: http://dmrx.net/dashboard/dmrx-dashboard-k4usd_network.html
(This only represents repeaters/users on our primary gateway/conference bridge)

Ham Friendly DMR Dealers

http://twowaydigitalradio.com (Motorola Dealer, new and used)

http://sandyscomm.com (Motorola Dealer)

http://connectsystems.com (DMR Dealer, friendly technical support)

https://www.bridgecomsystems.com/ (DMR Dealer, friendly technical support)

http://www.grapevineamateurradio.com (very friendly dealer in Grapevine TX)

http://www.randl.com (Everything Ham Radio in Hamilton OH)

http://www.hamradio.com (Everything Ham Radio, largest dealer chain)

http://www.hamvention.org (While not a dealer, you will find everything you want there)

Revision:

09/16/2018 New Webpage released
09/22/2018 Added DMR Guide link
09/25/2018 Added TG3100, Added link to Technician Study Cards
10/05/2018 Revised web page, added some more dealers.