MDARC provides a wide variety of programs and activities for its members. These include hosting and staffing our Campout and Field Day each June, PACIFICON (ARRL Pacific Division convention since 1920) each October, public service events, great monthly meeting speakers, newsletter, ham radio classes, license testing, vehicle deployments, ATV and weekly on the air nets. Our annual holiday party and radio equipment auction are all enjoyable events!

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(See Announcements page for more.)

Ground Is A Myth

by Kristen McIntyre K6WX

Tuesday, June 11, 2024 @ 7:00 PM


June 22 & 23, 2024 Field Day

Olympic High School

2730 Salvio Street, Concord, CA


Upcoming License Testing

at Field Day, all are welcome

Saturday, June 22, 2024 @ 1:00 PM

Olympic High School

2730 Salvio St, Concord


Licensed for six months or less?

QRZ Jumpstart offer


Join/Renew your Membership in 2024


Special Event for All Hams

Thurs, Feb 29

Leap Day Net Fun


North Peak WX

real time weather


Congratulations to Award winners

Ham of the Year Larry Loomer KI6LNB,

Kilroy Key John Kearney KM6ZJT,

Appreciation Award Ed Morales KJ6KYT and

Appreciation Award John Primus AF6RJ.


We held three Auxiliary Classes in 2023.

Why Does Ham Radio Work
"When all else fails"?
by Kristen McIntyre, K6WX, ARRL Pacific Division Director

Phones, Fires, and Failures
by Alan Thompson, W6WNU

EMCOMM:  Preparation and Training (An Overview)
by Bill Shaffer N6SGT

See Class Details for videos.


Third Fri 7PM Meetings

Fri, June 21
No Fri Meeting

See the details on our
Speakers page.

Sat & Sun, June 22 & 23

Join us at Field Day

Olympic High School

2730 Salvio Street, Concord, CA

Please see our COVID-19 statement before attending any Club in-person meeting or event.

Hybrid Meeting!

Both In-Person and on Zoom

Our Savior's Lutheran Church

1035 Carol Lane

Lafayette CA

We meet upstairs in Oak View 3. Park in the Upper Parking Lot. Testing is also upstairs. Ask anyone when you arrive.

See our PACIFICON site for details on the best ham radio convention in the Western United States since 1920!

Oct 18-20, 2024

Special Service Club


MDARC Membership supports our voice & ATV repeaters (W6CX), Packet / APRS,

Education & Testing, Public Service, Activities and is

tax deductible.

Update Member Directory listings on the Member Portal

Register for
Technician, General

and Auxiliary


W6CX Repeaters

Atop Mt Diablo our repeater systems are among the best in Northern California! Talk to us on 147.060 MHz + / PL 100Hz. Radio nets occur on our systems and other systems.

Support our repeaters!

Join us and/or Donate

We accept donations to the club via PayPal. Please click this link to make a donation.

Note: MDARC is a 501(c)3 organization.

Amateur Radio Event Support

MDARC can help provide Amateur Radio communications support for your event and assistance planning better event communications, event safety and event coordination. We can support all event areas including areas where cell phones do not work, SAG/Sweep Vehicles, Rest Stops, Water Stations, etc. Contact the MDARC Public Service Coordinator listed on the Public Service Page for assistance.

Join our Club Groups.io email list to stay up to date on what's happening in the Club, meeting announcements, etc. For details see Communicating With You

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.