Mount Diablo
Amateur Radio Club

The Mount Diablo Amateur Radio Club (MDARC) was founded in 1946. Today it has a membership of over 300 dedicated hams and is one of the largest amateur radio clubs in California. MDARC's purpose is to encourage innovation in amateur radio, provide public service and educational opportunities, foster good will within our community, and have fun in the process.               


MDARC provides a wide variety of programs and activities for its members. These include hosting and staffing PACIFICON (ARRL Pacific Division convention) each October, bringing in great speakers and offering ham radio classes to the public.  Our annual picnic, holiday party and radio equipment auction are all enjoyable events!

About us

is an ARRL Special 
Services Club

Help us support our Repeaters!
Join us or Donate

You can donate to MDARC just by shopping at Amazon.Com.

Click Here for details.

We also accept donations to the club via PayPal. Please click this link to make a donation. Note: MDARC is a 501c3 organization.


in MDARC includes autopatch access to all   three MDARC voice repeaters (W6CX). We also maintain an ATV repeater, and support Packet / APS EchoLink, and IRLP. The W6CX D-STAR repeater is operational and connected to our gateway on the Internet.
About us

See what's Happening and Register now

Click this image to download the brochure:

Carrier Newsletter

MDARC Facebook Page
Public Service

Join Yahoo Groups

General Club Meeting

Friday, October 16, 7:00PM
Join us at PACIFICON for an informal meet-and-greet with some of our Forum Presenters
Come to the Marriott Hotel in San Ramon. See

Join Us!

Club Meeting Address

Our Savior's Lutheran Church
1035 Carol Lane
Lafayette CA

About us

Our Repeater systems are among the best in Northern California!
  • 2 Meters
         147.060 + / PL 100Hz    
  • 220 MHz
         224.780 - / PL 77Hz    
  • 440 MHz
         441.325 + / PL 100Hz
  • D-Star
         145.000 MHz / +2.5 MHz
  • ATV
         In 1289.25 MHz AM
         In 1292.5 MHz Digital
         In 1270.00 MHz FM
    In   915.00 MHz FM
    In   427.25 MHz AM
    Out 1244.50 MHz Digital
  • Packet/APRS Node
  • Echolink & IRLP