Repeater Systems

The Rocky Ridge Repeater Group (RRRG) is the Technical Committee of MDARC. RRRG is charged with the operation and maintenance of the club's repeaters located on Mt. Diablo. These repeaters are open repeaters. That is, they may be used by any licensed amateur radio operators regardless of club affiliation, so long as they are operated in accord with the FCC and club rules.

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Click here to report a problem with any of the W6CX repeaters.

W6CX and Northern California 440 Repeater Restrictions

The power output on our 70cm (440) repeater has been reduced by 50dB due to a request from the US Air Force. This change is necessary to mitigate the interference issue affecting the PAVE PAWS radar (PPR) system operating in the 70cm band. This has resulted in the following changes to our repeater system:

  • 440 and 220 are now permanently linked.

  • The Morning nets that were run on 220 linked to 440 are now run on 220 linked to 2m.

  • EchoLink and IRLP are both now accessible only from 2m.

  • The Thursday evening net will be conducted on 2m linked to 220 and 440.

  • The ATV output has been moved from 427.25 MHz AM to 1244.50 MHz Digital.

This is an issue that affects all Northern California 440 repeaters. Read more here:

The latest round of ARRL Communications to 440 UHF Repeater Owners in Northern California

W6CX Voice Repeaters

147.060 MHz + / PL 100Hz - EchoLink: W6CX-R /133896, IRLP: 3057 Stream Online

224.780 MHz -1.6 MHz, split / PL 77Hz

441.325 MHz + / PL 100Hz

W6CX ATV Repeater


430.0 MHz Digital
915.0 MHz Digital
1270.00 MHz FM
1273.0 MHz Digital
1292.50 MHz Digital


1244.50 MHz Digital


145.000 DUP + Offset 2.5 (Port C)

Full Details – click here

Packet / APRS

W6CX-3 Packet Node 144.39 This node is used for keyboard-to-keyboard packet and APRS (Automated Packet Reporting System). Node Name RRRG.

Repeater Malfunction Protocol

If there is a malfunction with any of the repeaters or nodes, please send us a short message to Do not assume that someone else has already notified us. We would rather have duplicate notifications than have none at all.

Please include the following information in your note:

  • Your name.

  • Your call sign.

  • Your phone number and/or email address (preferably both). This so we can contact you, should we need additional information.

  • The repeater or node with the problem; e.g., the frequency.

  • A description of the problem.

Thank you for your help.