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.

COVID-19 Revisited


All of us thought as the citizenry became vaccinated that we would soon be looking at the Covid pandemic in the rear-view mirror of our lives. How quickly things can take an abrupt change! The Delta variant of this virus, coupled with the reluctance by too many to get vaccinated, has caused a rebound of the number of new cases and unfortunately, deaths.

As expected, the Contra Costa County Health Department has acted accordingly with their Order dated 08/02/21 to help stem the transmission of this virus from both the unvaccinated and alarmingly to some of the vaccinated by requiring wearing masks in indoor public settings.

Therefore, MDARC will expect all participants in meetings and events sponsored by our club to follow Contra Costa County’s Order until such time it is modified or rescinded by the County.

For details of the CCC Order please use this link:

Health Orders | Coronavirus (



MDARC President

[For previous notes, please see our Announcements page.


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!

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Membership 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.

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Register for One of our
Training Courses or Classes

General Club Meeting

Friday, December 17, 7:00 PM

Kilroy Key and

Ham of the Year awards
plus Open Forum

See the details on our Speakers page.

Hybrid Meeting!

Both In-Person and on Zoom

Our Savior's Lutheran Church

1035 Carol Lane

Lafayette CA

Special Services Club

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

W6CX Repeaters

Our Repeater systems are among the best in Northern California!

Help us support our Repeaters!

Join us or Donate

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 501(c)3 organization.

Club Announcements
(See our
Announcements page for more.)

We have a new page on the web site, discussing
Azimuthal Maps. Anyone that does DX needs one of these. Check it out.

At the MDARC General Meeting Friday evening, it was announced that our normally-cancelled December meeting will be held after all
on our usual 3rd Friday, Dec 17, since the usual Holiday Banquet was cancelled (see the 09/13/2021 announcement below). See our Club Meetings and Speakers pages for details.

At the MDARC General Meeting Friday evening, it was announced that our November General Meeting will be held in the church's Sanctuary rather than our usual room. So park in the upper parking lot in November.

The Pacificon Committee has updated the COVID-19 statement on their website and a
dded a COVID Action Plan page showing how the mandates of the Contra Coast Health Services will be enacted. Please look it over before coming to Pacificon.

The MDARC Board of Directors voted this evening to cancel this year's annual Holiday Banquet, due to COVID concerns. We're all very disappointed, but are hopeful that we'll be able return to normal operations in 2022.

Join our Club email reflector, to stay up to date on what's happening in the Club, meeting announcements, etc. See our Communicating With You page for details.