Mount Diablo
Amateur Radio Club

The Mount Diablo Amateur Radio Club (MDARC) was founded in 1947. 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 goodwill 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

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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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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 our PACIFICON site for details on  the best ham radio convention in the Western United States! 

If you attended Pacificon 2017, please take our Pacificon Survey, to help us make Pacificon 2018 even better. Thankx!

Reservations for our annual Holiday Banquet are now available! See our Banquet web page to reserve your spot. See you there!

Membership renewal for 2018 had begun! See our Membership page to renew or change your information for the directory.

A new sub-section has been added to the About Us section of this web site. Called "Official Documents", it contains copies of our Bylaws, Operational Polices and other documents. Check it out.

response to the Northern California fires, some response groups may be using our 2 meter repeater, and possibly other systems, as part of their communications services. Note that fire-related traffic has priority over all other non-emergency traffic until our systems are no longer needed for this emergency. Please understand the urgency for these services and yield the channel when needed for fire-related traffic.

We've added a new page to the web site, describing our Club's committees. Check it out and let us know how you'd like to help. See the Committees page.

The 48th Anniversary Campout Party, organized by Knights of the Megahertz & MDARC, will be on June 2nd-4th this year. They'll be at the
Sugar Pine Dam Recreation Area in the Forbes Creek area. They're
limited to 50 people at this site so get your reservations in early. See the Campout Party web page for full details and to register.

Our web site has a new page on Radio Operating Procedures. A great reference for new hams and a good review for veterans. Check it out.

The PowerPoint slides from yesterday's presentation on DMR by
Tim Barrett, K6BIV, are now available from a link at the end of his description and biography on our Speaker's page.

We had planned to have Chris Wilson from Yaesu talk to us at the February meeting to give us a System Fusion Demonstration.  Unfortunately, Chris is no longer with Yaesu and is unavailable. No worries! Our own Tim Barret, K6BIV, will be here to answer the question "So You Got a DMR Radio, Now What?" See our Speakers page.

Have you seen something called an "IP rating" in the specs of your new radio or cell phone? Wonder what it means? Check out our new web page on IP Codes, in the Resources section under Equipment.

We're kicking off the year at our January 20 meeting with a wonderful presentation by a true expert in the area. Michelle Paquette, AA6MP, will teach us the Basic Antenna Principals we need to know. See the details on our Speakers page.

Our annual Holiday Banquet will be on December 2nd at
Zio Fraedo’s, 611 Gregory Ln., Pleasant Hill.

Earlier this month, MDARC became the proud owner of an Electronic News Gathering (ENG) van, donated to us by KGO-TV in San Francisco. Check it out on our Vehicles page.

We now have a wonderful Pacificon 2016 Introductory Video, prepared by none other than Randy Hall, K7AGE, famous for his hundreds of ham-related videos and his YouTube channel.Take a look at it.

The first ad for Pacificon 2016 is in the August edition of QST, page 148. A beautiful full-pager. Check it out!

07/26, 2016
Our August meeting will have a "Don't Miss" presentation for anyone interested in passing traffic, especially during emergencies. See our Speakers page for details.

Wednesday, July 20, is the Round Table Pizza fundraiser for MDARC. See our Fundraiser page for details.

Our web site's Technical Resources section has a new page, on Narrow Band Emergency Messaging System (NBEMS), which uses the Fldigi software. Check it out.

Our Field Day this year turned out to be very good, thanks to the extraordinary efforts of the Field Day Chair, Larry Loomer, KI6LNB; and the head chef, Misa Siemons, KJ6BUE. See the details on our Club Announcements page.

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, February 16, 7:30PM
If the VIRGA obscures your CREPUSCULAR RAYS, hope for the PETRICHOR, and not the DERECHO!
by Ron Bunch, W4FEK

See the details on our Speakers page.

About us

Our Repeater systems are among the best in Northern California!