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!
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Donate to MDARC
You can donate to MDARC just by shopping at AmazonSmile.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.
A new page has been added to the Resources section of our web site, in the
Technical category. It describes the Decibel and how it's used. See the Decibels page.

The club is having a Fundraiser at Round Table Pizza in Pleasant Hill on July 20. See the Round Table Fundraiser page for details.

The Pacificon 2016 brochure is now available for distribution. Download a copy from our Brochure page.

The 47th Anniversary Camp-out Party, sponsored by the San Francisco Amateur Radio Club & Mount Diablo Amateur Radio Club, will be June 3-5. A great get-together with a long tradition.
See for details and to register.

Our speaker for the May meeting has been announced! See the details on our Speakers page.

We now have detailed instructions on our web site for obtaining an official copy of your ham license, thanks to John Primus, AF6RJ. See the

License Copy Acquisition page. Thankx, John!

The Keynote Speaker for Pacificon's Banquet has been confirmed. New ARRL CEO and Secretary Tom Gallagher, NY2RF, will be here with a great presentation. See the Banquet page for details.

Public Service events for 2016 are now on our web site. Check them out and sign up on our Public Service page.

The PACIFICON 2016 web site is live! Check it out at The conference registration section isn't ready yet, but will be soon. Keep checking back, as we will be updating the site frequently.

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, May 20, 7:30PM
Coax Versus Coax
Steve Lampen
Belden Cable
See the details on our Speakers page.

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