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 Note:
MDARC has taken a conservative approach during this COVID-19 pandemic by following the County’s public health guidelines. This has meant replacing our usual in-person meetings with virtual meetings which have been embraced by our members and a big success in keeping our ham radio community together. Members are invited to attend our monthly Board Meetings and both members and guests are encouraged to join our monthly virtual General Meetings. Two great opportunities to “see and hear” one another. Check out this website for dates and times.

 As we all work through these times, please check these websites for more information .
Link to Contra Costa Health Services

Link to the Alameda County Public Health Department

Link to the Solano County Public Health Department

Stay safe.
On behalf of the MDARC Board and myself,
LarryB KK6QPE; 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!

About us

is an ARRL Special 
Services Club

Help us support our Repeaters!
Join us or Donate

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.

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.

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.
About us

Pacificon 2020 Logo

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

Bob Heil to speak at our Holiday Get-Together!
Bob Heil, K9EID is set to kick off our holiday Zoom event beginning at 16:00 local time on December 6th Note the early start, to accommodate Bob's time zone. Mark your calendar now.

The list of candidates for our upcoming election has been updated. See it below right.

At last night's meeting, the MDARC Board approved a plan to hold a holiday celebration, even though it will not be the traditional in-person Banquet. It will be on Sunday, Dec. 6, 2020. See our Holiday Banquet page for more information.

Search this website!
In case you've wondered why there is no search box on our website, it's because of restrictions Google places on it's location. But you can still search for any text string on our site. Just enter into your browser's address field or your favorite search engine the following (without the quotes):
" yourtextstring"
replacing "
yourtextstring" with the text you're searching for.
For example, if you want to find the word "license", enter:
" license"
You can search the Pacificon web site in a similar manner.


MDARC elections are coming up! See the right column of the home page for a list of candidates. If you're interested in running for the Board, or know someone who may be, contact one of the Election Committee shown.

Our General Class license upgrade course will begin Tuesday, Aug. 4. It will be completely online, via Zoom. If you're thinking of upgrading, go to our Class Details page and register right away.

There will be a Getting-on-the-Air (GOTA) class for the recent candidates of the Concord license testing sessions, and for any other hams that would like to get started in using their amateur handheld radios.

The classes will be held on the Zoom format on Friday, July 17, at 6:00 PM, and in-person, with masks and social distancing, on July 18, at 6:00 PM.

Please contact Larry Loomer, KI6LNB, at <> for further information and to reserve a spot in the classes.

The President's COVID-19 note has been updated at the top of this page.

The video recording of Friday evening’s Club meeting and presentation is now available on MDARC’s YouTube channel, at:

It’s also available on the Club’s web site Speaker’s page, under the description of the presentation.

The Field Day page has been updated with the latest information about how it will work this year. Take a look and get ready!

The abstract and biographies for our June meeting presentation are now on our Speakers page. Take a look.

Remember that this will be a Zoom videoconference meeting only, and the access information will be sent out via our forum. So if you're not a member of the forum, join now.

Our President, Larry Bradley, KK6QPE, has updated his COVID-19 note. Please see it at the top of the Home page.

Our Annual Auction is canceled, but we've not giving up! We're hosting a Virtual Get-Together on our normal meeting night; this Friday, April 17 at 7:00 on the Zoom videoconferencing system. See our Speakers page for details.


Did you know there are 13 ways the Club has for communicating with you, our members and the ham community at large? Yes, 13. See our new Communicating With You page for the list.

Our Pacificon 2020 web site is Live!
Attendee registration will open in early May; and we have much to add as we get closer to this event. So check it out now and come back for updates. See it at

Registration for our Holiday Banquet is Open!! See our Banquet page for details.

Remember, our Club meeting this month will be held this Friday night, at Pacificon in San Ramon. It will not be at our usual location in Lafayette. See our Club Meetings page for the full year's schedule. And see our Speakers page to see what the presentation is about.

Also, there will be no license testing Friday, but we will have extended testing sessions at Pacificon on Saturday and Sunday. See you there.

October 5, 2019
To accommodate a need by our long-term Banquet host, Zio Fraedo's; our Banquet date for this year has been changed from Sunday, December 8, 2019 to Saturday, December 7, 2019. See our Banquet page for details on the evening and remember to update your calendar with the new date.

July 7, 2019
Two more pages have been added to our web page. Our Club's two vehicles, a van and a trailer, now have their own pages, and the main Vehicles page has been revised. Have a look, starting at our Vehicles page.

July 5, 2019
Our web site has a new page; Latitude, Longitude, UTM. It's a summary description of two major geographic coordinate systems often useful for hams. Check it out.

June 19, 2019
Field Day is this weekend! We'll be at Heather Farm Park in Walnut Creek again this year. Come on down! See our Field Day page for details.

June 7, 2019
Our June speaker has now been announced.  Ed Muns, W0YK, will give us a good education on the new protocol, FT8. See our Speakers Page for details.

The Pacificon web site and registration is now Open! Get your registrations in and see what happening this year. More details will be added as we have them, so check back occasionally.

We now have our Speaker for the May Club meeting. Marcel Stieber, AI6MS will tell us about "ARKnet - Wireless Emergency Intranet". We'll post details on our Speakers Page shortly after the Auction, April 26.

The annual MDARC Campout has been scheduled. Capacity is limited, so sign up early. See the Campout-2019 page for details.

The Club's bylaws were amended by a vote of the membership to allow voting electronically. See the amended bylaws on the Bylaws page.

Several new pages have been added to the web site over the last several weeks., as well as updates to others. See the list of new pages on the main Club Announcements page.
Carrier Newsletter

Public Service

General Club Meeting

Friday, November 20, 7:00PM
Morse Code Keys (and Keyers)
by Matthew G. Vurek, N4DLA

See the details on our Speakers page.

About us

Our Repeater systems are among the best in Northern California!

MDARC Elections - 2020

Friday, Nov. 20, 2020

Here is your opportunity to be part of the future of MDARC.  We look forward to receiving several nomination for each of these very important positions. Please nominate yourself or another club member by emailing one of the members of the election committee below.

Larry Bradley, KK6QPE*

Vice President
Jan Kulisek, KM6FNC


Cathi Walton, K2CJW*

Emergency Coordinator
Ron Bunch W4FEK*

Director at Large
Mike Warren W6MEW*

Director at Large
Cal Vasquez, K6VT

* indicates incumbent

Election Committee
Dick Wade WM6G
Dave Piersall NG6ORB
Pete Harris KE6ZIW