Mount Diablo
Amateur Radio 

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

MDARC is an ARRL Special Services Club

is an ARRL Special 
Services Club


Help us support our Repeaters!
Join us or Donate

We now have a way to accept donations to the club via paypal. Please click this link to make a donation. Note: MDARC is a 501c3 organization.


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

Carrier Newsletter

MDARC Facebook Page
Public Service

Join Yahoo Groups

General Club Meeting

Friday, February 20
Our speaker will be:
Kevin Slovick, KS4FUN of the 
American Red Cross

Join Us!

Club Meeting Address

Our Savior's Lutheran Church 1035 Carol Lane Lafayette CA

About us

  • 147.060 / PL 100Hz    
  • 224.780 / PL 77Hz    
  • 441.325 / PL 100Hz     
  • ATV:   In 1289.25
  •           In   919.25
  •           In   427.25
  •         Out 1241.25