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.

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MDARC Facebook Page


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.
We're swapping our agenda at the General Meeting this month. The speaker will address us first, at 7:30pm, followed by the business meeting, rather than our usual other-way-around. So be sure to get there on time!

Our D-Star system is now sharing the antenna up on the tower with our 2-meter system, higher than ever. If you're a D-Star user, give it a try and see how the reception has improved.

A Glossary for Amateur Radio has been added to the Resources section of our web site. Check it out.

The PACIFICON committee meeting for February has been cancelled. We'll see you in March.

The Board meeting was postponed a week. It's tomorrow night. Y'all come! See our Club Meetings page for the location & details.

General Class upgrade course starts in March! See Classes-2016 for details.

Carrier Newsletter

Public Service

General Club Meeting

Friday, February 19, 7:30PM
The Russians are Coming! ~~ or, Suburban Radio Fun in the Cradle of Radio
Bart Lee, K6VK
Counsel Emeritus,
Historical Archivist
California Historical
Radio Society

See our Speakers page for details.

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